WO2007013219A1 - Iron supplying agent for plant for use in alkaline soil, and process for production of the same - Google Patents

Abstract

Disclosed is an iron-supplying agent for a plant for use in an alkali soil which can provide an aqueous solution having a high Fe2+ ion concentration and showing the reduced oxidation of Fe2+ ions. The iron-supplying agent comprises an aqueous solution having ascorbic acid and an iron component dissolved therein. Alternatively, the iron-supplying agent may be prepared by removing water from an aqueous solution having ascorbic acid and an iron component dissolved therein. The iron-supplying agent can be prepared by a process comprising the dissolution step in which a mixture of an ascorbic acid powder, an iron component powder (e.g., an FeO powder) and water is heated to give an aqueous solution having the ascorbic acid powder and the iron component powder dissolved therein. Preferably, the FeO powder used is produced by heating under vacuum granules which are produced by granulating an iron-containing dust and/or granules which are produced by granulating an iron-containing dust together with a reducing agent and then quickly cooling the resulting granules under reduced pressure.

Description

 Specification

 Iron supply agent for plant for alkaline soil and method for producing the same

 Technical field

The present invention relates to a plant iron supply agent for alkaline soil and a method for producing the same. More specifically, the present invention relates to an iron supplier for plant for alkaline soil having a high Fe ²⁺ ion concentration in an aqueous solution state and suppressing the acidity of Fe ²⁺ ions, and a method for producing the same.

 Background art

[0002] Iron is a trace essential element for plants, and deficiency is known to cause peculiar symptoms such as yellowing of leaves and impaired protein synthesis reaction. In addition, iron is taken in a state of being turned on. However, among Fe ions, Fe ³⁺ ions are known to be difficult to obtain a satisfactory effect on plants even if they are supplied. Therefore, conventionally, it devised to supply iron as Fe ²⁺ ions have been made. However, Fe ²⁺ ions is desired to be able to supply an easy tool Fe ²⁺ ions by prolonged connexion stability becomes Fe ³⁺ is Sani匕.

 As a composition for supplying iron to this plant, the use of iron powder, converter slag, iron hydroxide, etc. has been proposed (for example, see Patent Document 1). There are known a method using an inorganic inorganic iron salt, a method using an EDTA iron complex with ethylenediamine tetraacetic acid (hereinafter simply referred to as “EDTA”), and the like.

Patent Document 1: Japanese Patent Laid-Open No. 8-277183

 Disclosure of the invention

 Problems to be solved by the invention

[0004] However, most of the iron content eluted from the iron-containing composition described in Patent Document 1 is Fe ^3+, and it is considered that it is particularly difficult for plants other than Gramineae plants to take up. In addition, the Fe ions that also generate the water-soluble inorganic iron salt force are easily oxidized to Fe ³⁺ which is difficult to maintain the Fe ²⁺ state. Furthermore, there is a problem that salt accumulation is caused as in the conventional case. That is, water-soluble inorganic metal salts have been used for a long time as various fertilizers, and the strong acid anions constituting these water-soluble metal salts combine with other elements in the soil to form water-insoluble salts. Accumulation in soil is a problem. Water-soluble inorganic iron salts cannot solve this problem. Furthermore, it is virtually trivalent iron that is used as the EDTA iron complex. In addition, EDTA is a strong chelating agent, and it is feared that fixing heavy metals in the soil will cause soil contamination, and that it will dissolve into groundwater and cause water contamination.

[0005] The present invention is intended to solve the aforementioned conventional problems, it has a high Fe ²⁺ I O emissions concentration in aqueous solution, and Fe ²⁺ for alkaline soils acid I spoon is suppressed ion An object is to provide a plant iron supplier (hereinafter sometimes referred to as “plant iron supplier”) and a method for producing the same.

 Means for solving the problem

[0006] The present invention is as follows.

 (1) A plant iron supply agent for alkaline soil, comprising an aqueous solution obtained by dissolving ascorbic acid and an iron component.

 (2) The plant iron supply agent for alkaline soil according to the above (1), wherein the iron component is metallic iron and Z or FeO.

 (3) The plant iron supply agent for alkaline soil according to claim 2, wherein the iron component is FeO.

(4) The iron component is FeO, when containing the Fe ²⁺ ions and Fe ³⁺ ions, and the total of the Fe ²⁺ ions and the Fe ³⁺ ions is 100 mass%, the Fe ^The iron supply agent for plant for alkaline soil according to the above (1), wherein the ²⁺ ion is 50 to 99% by mass.

(5) The iron component is FeO, a Fe ²⁺ ion concentration of the aqueous solution, the hydrogen ion exponent measured at 7.0 above area, then the aqueous solution was allowed to stand for 120 hours, again Fe ²⁺ The iron supply agent for plant for alkaline soil according to the above (1), wherein the concentration after standing is 80% or more of the concentration before standing when the ion concentration is measured.

 (6) The plant iron supply agent for alkaline soil according to (1) above, which contains a biodegradable binder.

 (7) The plant iron supply agent for alkaline soil according to (1) above, which contains a biodegradable extender.

(8) Aqueous solution obtained by dissolving ascorbic acid and iron component An iron supply agent for alkaline soil plants.

 (9) The plant iron supply agent for alkaline soil according to (8), wherein the iron component is metallic iron and Z or FeO.

 (10) The plant iron supply agent for alkaline soil according to (9), wherein the iron component is FeO.

(11) The above-mentioned iron component is FeO, and the aqueous solution obtained by dissolving the plant iron supply agent for alkaline soil contains Fe ²⁺ ions and Fe ³⁺ ions, and the Fe ²⁺ ions and the Fe ^The plant iron supply agent for alkaline soil according to (8) above, wherein the Fe ²⁺ ions are 50 to 99% by mass when the total of ³⁺ ions is 100% by mass.

(12) The Fe ²⁺ ion concentration of an aqueous solution in which the iron component is FeO and in which the iron supply agent for alkaline soil plant is dissolved is measured in the region where the hydrogen ion index is 7.0 or more, and then When the aqueous solution is allowed to stand for 120 hours and the Fe ²⁺ ion concentration is measured again, the concentration after standing is 80% or more of the concentration before standing, for alkaline soil according to (8) above Plant iron supply.

 (13) The plant iron supply agent for alkaline soil according to (8), which contains a biodegradable binder.

 (14) The plant iron supply agent for alkaline soil according to the above (8), which contains a biodegradable extender.

 (15) An iron supply agent for plants for alkaline soil, characterized by comprising a granular material containing ascorbic acid and an iron component in a matrix made of peat and / or clay.

(16) The peat and / or clay, the sum of the FeO which is contained as the Asukorubin acid and the iron component is 100 mass _^0/0, the Asukorubin acid Ri 1-30 mass _^0/0 der The Fe iron for alkaline soil plants according to (15) above, wherein the FeO is 1 to 30% by mass.

 (17) A heating step comprising heating a mixture containing ascorbic acid powder, iron component powder, and water to provide an aqueous solution obtained by dissolving the ascorbic acid powder and the iron component powder. A method for producing a plant iron supply agent for alkaline soil.

(18) The above-mentioned (17), wherein the iron component powder is iron powder and Z or FeO powder. The manufacturing method of the iron supply agent for plants for potash soil.

 (19) The method for producing an iron supply agent for a plant for alkaline soil according to (18), wherein the iron component powder is FeO powder.

 (20) The method for producing an iron supply agent for an alkaline soil plant according to the above (17), further comprising a drying step for removing water.

 (21) The above FeO powder is prepared by vacuum heating a granulated product obtained by granulating iron-containing dust and a granulated product obtained by granulating Z or iron-containing dust and a reducing agent. The method for producing an iron supply agent for a plant for alkaline soil according to the above (19), which is FeO powder obtained by vacuum quenching.

 (22) The method for producing an iron fertilizer for plants according to (15) above, wherein the peat and / or clay, ascorbic acid powder, and iron component powder are mixed,

A method for producing an iron supply agent for a plant for alkaline soil, characterized by granulating.

 (23) The method for producing an iron supply agent for a plant for alkaline soil according to (22), wherein the iron component powder is iron powder and Z or FeO powder.

 (24) The method for producing an iron supply agent for an alkaline soil plant according to the above (23), wherein the iron component powder is FeO powder.

 (25) When the total of the peat and / or clay, the ascorbic acid powder and the FeO powder is 100% by mass, the ascorbic acid powder is 1 to 30% by mass, and the FeO powder is 1 to 30%. The manufacturing method of the iron supply agent for plants for alkaline soil as described in said (24) which is the mass%.

 (26) The above FeO powder is prepared by vacuum heating a granulated product obtained by granulating iron-containing dust and a granulated product obtained by granulating Z or iron-containing dust and a reducing agent. The method for producing an iron supply agent for a plant for alkaline soil according to the above (24), which is FeO powder obtained by vacuum quenching.

The invention's effect

An aqueous solution obtained by dissolving ascorbic acid and an iron component, and an aqueous solution obtained by dissolving ascorbic acid and an iron component. According to another iron supply agent for alkaline soil plants of the present invention obtained by removing Particularly when the iron component is FeO, obtained higher Fe ²⁺ ion concentration. That is, for example, even when water is dissolved in soil, a high Fe ²⁺ ion concentration can be obtained, and iron can be supplied with high probability. Further, the resulting Fe ²⁺ ions for effectively Sani spoon is suppressed, it is the supply of iron at a high probability. In addition, because it uses ascorbic acid, it is safe to use with no environmental impact.

In addition, when the iron component is FeO and has a predetermined Fe ²⁺ ion ratio, iron can be supplied with a particularly high probability.

Furthermore, when the iron component is FeO and the pH is measured in the region of 7.0 or more, and then the Fe ²⁺ ion concentration after standing for a predetermined time is 80% or more immediately after the start of measurement, it is particularly high. It has antioxidant properties and can supply Fe ²⁺ ions stably over the long term.

Moreover, when a biodegradable binder is contained, it can be set as the iron supply agent for plants which has the sustained release property which supplies Fe ^<2+ > stably and gradually over a long period of time.

Furthermore, when a biodegradable extender is contained, the Fe ²⁺ supply amount can be easily kept within an appropriate range, and the versatility is excellent.

[0008] According to still another plant iron supplier for alkaline soil according to the present invention, the iron component for alkaline soil according to the present invention comprises a granular material in which ascorbic acid and an iron component are contained in a matrix made of peat and / or clay. When it is FeO, the oxidation of Fe ²⁺ is more reliably suppressed, and a plant iron supply agent having a sustained release property that supplies Fe ²⁺ particularly stably and gradually can be obtained.

 Furthermore, when the total amount of peat and / or clay, ascorbic acid and FeO contained as an iron component is 100% by mass, ascorbic acid is 1 to 30% by mass and FeO is 1 to 30% by mass. In this case, it is possible to obtain an iron supply agent for plants having more reliable sustained release.

[0009] According to the production method of the present invention including the dissolution step, the plant iron supply agent for alkaline soil according to the present invention comprising the aqueous solution obtained by dissolving ascorbic acid and the iron component is stabilized. Can be obtained reliably.

In addition, when the aqueous solution is equipped with a drying process for removing water, the aqueous solution obtained by dissolving ascorbic acid and the iron component is used to remove water from the aqueous solution for alkaline soil plants of the present invention. An iron supply agent can be obtained stably and reliably. According to still another production method of the present invention including a granulation step, it is possible to stably and reliably obtain an iron supply agent for alkaline soil plants having a sustained release property using peat and / or clay as a matrix. it can.

 Also blended as peat and / or clay, ascorbic acid powder and iron component powder

When the total amount of FeO powder is 100% by mass, the ascorbic acid powder is 1-30% by mass, and the FeO powder power is 30% by mass. It can be used as an agent.

 Further, in the production method of the present invention, another production method of the present invention, and still another production method of the present invention, the iron component powder is FeO powder, and this FeO powder is vacuum-quenched after the granulated product is heated in vacuum. In the case of the FeO powder obtained in this way, it is possible to reliably and stably obtain a plant iron supply agent that has particularly high acidity and contains FeO.

Brief Description of Drawings

圆 1] It is explanatory drawing which shows the growth condition of the rice of Experimental example 7 using the other iron supply agent for plants which uses a biodegradable extender as a matrix with the growth condition when using only a fertilizer.圆 2] Experiments using other plant iron suppliers with biodegradable extender as matrix The growth of the above-ground part of rice in 9 to 16 together with the growth of Experiment 8 using only fertilizer It is explanatory drawing shown.

 FIG. 3 is an explanatory diagram showing a comparison of the growth situation of the above-ground part of Experimental Example 8 using only fertilizer and the growth situation of the above-ground part of rice of Experimental Examples 9 and 10.

 FIG. 4 is an explanatory diagram showing a comparison of the growth situation of the above-ground part of Experimental Example 8 using only fertilizer and the growth situation of the upper part of the rice of Experimental Examples 11 and 12.

 FIG. 5 is an explanatory view showing a comparison of the growth situation of the above-ground part of Experimental Example 8 using only fertilizer and the growth situation of the upper part of the rice of Experimental Examples 13 and 14.

 FIG. 6 is an explanatory diagram showing a comparison of the growth situation of the above-ground part of Experimental Example 8 using only fertilizer and the growth situation of the upper part of the rice of Experimental Examples 15 and 16.

圆 7] Experiments using other plant iron suppliers with biodegradable extenders as matrixes Show the growth of rice roots in Examples 9 to 16 together with the growth of Experiment 8 using only fertilizer FIG. FIG. 8 is an explanatory diagram showing a comparison of the growth situation of the above-ground part in Experimental Example 8 using only fertilizer and the growth situation of the root part of rice in Experimental Examples 9 and 10.

 FIG. 9 is an explanatory diagram showing a comparison of the growth situation of the above-ground part in Experimental Example 8 using only fertilizer and the growth situation of the root part of rice in Experimental Examples 11 and 12.

 FIG. 10 is an explanatory diagram showing a comparison of the growth situation of the above-ground part in Experimental Example 8 using only fertilizer and the growth situation of the root part of rice in Experimental Examples 13 and 14.

 FIG. 11 is an explanatory diagram showing a comparison of the growth situation of the above-ground part in Experimental Example 8 using only fertilizer and the growth situation of the root part of rice in Experimental Examples 15 and 16.

 BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the present invention will be described in detail.

 [1] Plant iron supply for alkaline soil

 The plant iron supply agent for alkaline soil according to the present invention (hereinafter simply “the iron supply agent for plants” t t) is composed of an aqueous solution obtained by dissolving ascorbic acid and an iron component. Features.

 Another plant iron supplier for alkaline soil of the present invention (hereinafter simply referred to as “the other plant iron supplier”) has an aqueous solution obtained by dissolving ascorbic acid and an iron component. It is characterized by removing. That is, the other iron supply agent for plants can be obtained by removing water from the iron supply agent for plants.

 Still another plant iron supply agent for alkaline soil according to the present invention (hereinafter simply referred to as “this further iron supply agent for plants”) contains peat and / or a matrix that also has clay power, ascorbic acid and an iron component. It consists of the contained granular material, It is characterized by the above-mentioned.

[0012] Alkaline soil in each of the above inventions means that when 10g of air-dried soil is charged with 25ml of distilled water and shaken for 1 hour and the pH of the resulting suspension is measured, the pH is 7 This refers to soil that exceeds the threshold. Accordingly, the alkaline soil includes alkaline soil obtained by alkaline conversion of the original alkaline soil and non-alkali soil, for example, by fertilization, desert rehabilitation, or the like. Examples of the above basic alkaline soil include soils containing various calcareous components such as shell fossil soil, calcareous soil, and clay soil. These may be used alone or in combination of two or more. In addition, these various calcareous components It is a mixed soil of potash soil and non-alkaline soil, and it is included after being alkaline soil as a whole.

 In addition, the “iron component” in each of the above inventions is not particularly limited, and may be metallic iron such as iron powder, which may be an iron compound. The iron compound is not particularly limited, but a compound having divalent iron in the molecule is more preferable. Examples of the iron compound include oxides such as FeO, FeSO, Fe

 Four

(NO), inorganic salts such as FeCl, organic salts such as trimethoxy iron and Fe-EDTA, Fe-ED

3 2 2

 Examples include chelate compounds such as DHA. As this iron compound, FeO is particularly preferred. Only one type of iron compound may be used, or two or more types may be used in combination. Further, metallic iron and one or more iron compounds may be used in combination. The iron component is metallic iron and Z or FeO, preferably S, more preferably FeO.

 [0014] (1) Iron supply agent for this plant

The “ascorbic acid” is an organic acid having a hydroxyl group. This ascorbic acid has no irritating odor. When an aqueous solution containing ascorbic acid and an iron component is prepared, the Fe ²⁺ ion concentration relative to the ascorbic acid concentration can be increased.

 [0015] The "aqueous solution" is an aqueous solution obtained by dissolving ascorbic acid and an iron component.

 That is, it is an aqueous solution that does not contain easily dissolved ascorbic acid and not easily dissolved pig iron component. However, this aqueous solution may be a supernatant in a solid-liquid coexisting material containing ascorbic acid and / or an iron component that cannot be dissolved.

 Further, the dissolved state of ascorbic acid and the iron component in the aqueous solution is not particularly limited. That is, for example, the aqueous solution of ascorbate and ascorbate ions can be contained in this aqueous solution. Among these, it is particularly preferred that an iron ascorbate complex is contained.

 [0016] The amount of ascorbic acid dissolved in this aqueous solution is not particularly limited. Usually, the amount of ascorbic acid per 100 ml of water is 0.05 g or more (preferably 0.5 g to the solubility of ascorbic acid at the temperature of the aqueous solution). is there. On the other hand, the iron component can be added in an amount of 10 to 25 parts by mass, particularly 20 to 25 parts by mass, with ascorbic acid being 100 parts by mass.

[0017] The water constituting the aqueous solution is not particularly limited, and various types of water can be used. Tap water and industrial water that can be highly purified water such as pure water and ion exchange water Ordinarily used water such as agricultural water and groundwater may be used.

 [0018] The method for obtaining this aqueous solution is not particularly limited, but can be obtained by a production method described later. That is, it can be obtained by heating a mixture containing (1) ascorbic acid powder, iron component powder, and water. In addition, (2) it can also be obtained by adding an iron component powder to an ascorbic acid aqueous solution in which the entire amount is dissolved in advance and heating. Alternatively, (3) an ascorbic acid powder and an iron component powder may be further added to an ascorbic acid aqueous solution in which a predetermined amount is dissolved in advance and heated. Furthermore, (4) it can be obtained by mixing ascorbic acid powder, iron component powder and water without heating. Further, (5) in addition to the above (1) to (4), when dissolved, lascosulvic acid and dissolved, and when FeO is contained, these are separated by a method such as filtration. It can be set as the manufacturing method provided with a process.

[0019] The plant iron supply agent may contain a pyroligneous acid solution for fungicide. When the wood vinegar is included, the content of the wood vinegar is preferably 10% by mass or less (usually 5% by mass or more) of the whole iron supply agent for plants. Furthermore, ultraviolet irradiation can be performed in advance for the same purpose. Although the ultraviolet irradiation conditions are not particularly limited, it is preferable to use ultraviolet rays having a wavelength of 200 to 380 nm. When irradiation is performed, it is preferable to irradiate 72 × 10 w ′s / cm ² or more. Furthermore, when storing, it is preferable to store at a low temperature. The temperature is not particularly limited! / ヽ is preferably 15 ° C or less.

 The nature of the iron supply agent for plants will be described later.

 [0020] (2) Other iron supply agents for plants

 This other iron supply agent for plants is obtained by removing the aqueous solution water.

 The above “removal” means an operation of removing a part or all of water from the aqueous solution, but usually the water content with respect to the whole other iron supply agent for plants is 90% by mass or less. In particular, the water content is 10% by mass or less (preferably 5% by mass or less) for solid materials, and the water content is 60 to 90% by mass (preferably 65 to 85% by mass) for pastes. The other iron supply agent for plants may be a solid material from which substantially all water has been removed from the aqueous solution, or may be a paste-like material from which some water has been removed from the aqueous solution. Of these, solids are preferred.

The method for removing the water is not particularly limited, and drying under reduced pressure, drying under normal pressure, Means such as thermal vacuum drying and freeze-drying can be used. Of these, vacuum drying is preferred. This is because it is possible to suppress the oxidation of Fe ²⁺ during the process of removing water. In addition to drying under reduced pressure, drying under a low oxygen partial pressure may be used.

[0021] When heating at the time of removing water, the temperature of the aqueous solution is not particularly limited, but is preferably maintained at 120 ° C or lower. When the temperature exceeds 120 ° C, the Fe ³⁺ ion concentration tends to increase. The temperature of the aqueous solution by this heating is particularly preferably 100 ° C. or less, more preferably 90 ° C. or less, and further preferably 70 ° C. or less. On the other hand, the lower limit temperature is not particularly limited, and may be any temperature that causes transpiration of water under the pressure when removing water. The temperature of the aqueous solution is, for example, preferably 45 ° C or higher, more preferably 50 ° C or higher, more preferably 55 ° C or higher, particularly preferably 60 ° C or higher, and particularly preferably 65 ° C or higher. . These upper limit temperature and lower limit temperature in the heating can be combined. That is, for example, 45 to 120 ° C is preferable, 50 to 100 ° C is more preferable, and 60 to 70 ° C is more preferable. Combinations other than these may be used.

 [0022] Further, when reducing the pressure when removing water, the pressure is not particularly limited, but is preferably 0.1 to 50 kPa force S, more preferably 0.1 to 20 kPa force S, more preferably 3 to 15 kPa force, 4 to 1 OkPa is particularly preferred.

 [0023] In general, the other iron supply agents for plants can be dissolved almost entirely in water having a temperature of 15 ° C or higher. For example, it is possible to dissolve 0.1 lg or more (further 0.1 to 120 g, particularly 0.1 to 50 g, especially 0.1 to 15 g) in 100 ml of pure water at a temperature of 25 ° C. The properties of the aqueous solution in which this other iron supply agent for plants is dissolved will be described later.

 Regarding the treatment for ascorbic acid, aqueous solution, water, and fungicides in this other iron supply agent for plants, the descriptions in the iron supply agent for plants can be applied as they are.

 [0024] The method of using the other iron supply agent for plants is not particularly limited. For example, it can be mixed with soil (powdered or lump), sprayed on soil (powdered), or buried in soil (powdered or lump).

 [0025] (3) Items common to the plant iron supply agent and other plant iron supply agents

The aqueous solution in which the plant iron supply agent and other plant iron supply agents are dissolved in water, Re is a Fe ²⁺ ions and Fe ³⁺ ions are contained, especially if the iron component is FeO, when the total of the Fe + I O emissions and Fe ³⁺ ions is 100 mass _^0/0, Fe ^{2 +} ions 50 to 99 mass _^0/0 (even 60-90% by weight, in particular 70 to 90 wt%) is contained. That, Fe ³⁺ ions 1-5 0% by weight (still more 10 to 40% by weight, in particular 10 to 30 wt%) is contained. That is, an aqueous solution containing Fe ²⁺ at a high concentration can be obtained. However, this Fe ²⁺ ion concentration is a value measured by the measurement method of the example described later. The Fe ³⁺ ion concentration is dissolved by stirring and mixing in ion-exchanged water at a temperature of 20 ° C so that the concentration of the iron supply agent is 10 gZ liter (about 1.0% by mass) (stir for about 5 minutes). Then, filter using a membrane filter (pore size 1 μm). Immediately after filtration, attach a water quality measurement pack to an ultraviolet / visible light spectrophotometer (Shimadzu Corporation, model “UV1240”). The amount of Fe ²⁺ ions and the total amount of Fe ions contained in the aqueous solution were measured, and the total amount of Fe ions was also calculated by subtracting the amount of Fe ²⁺ ions.

[0026] In addition, in the aqueous solution in which each of the plant iron supply agent and the other plant iron supply agents is dissolved, particularly in the case where the iron component strength is SFeO, Fe ^{2 in} the region where the pH is 7.0 or more. ⁺ ions to determine the concentration (MGZ liters), then allowed to stand for 120 hours, the measured Fe ²⁺ ion concentration again, at least 80% of the Fe ²⁺ ion concentration of an置前. In other words, it is an iron supply agent that can stably hold Fe ^{2+ ions} for a long period of time and is excellent in anti-oxidation properties that are suppressed from being oxidized to Fe ³⁺ . However, the above standing shall be in a dark place at a temperature of 25 ° C where it is not exposed to UV rays. This Fe ²⁺ ion content is a value measured by the measurement method of Examples described later.

[0027] Further, the plant iron supply agent and the other plant iron supply agents may contain a biodegradable binder. By containing a biodegradable binder, the iron supply is gradually released as the binder is decomposed to produce Fe ²⁺ . Therefore, it is possible to supply Fe ²⁺ ions stably over a long period of time. That is, sustained release can be imparted to the plant iron supply agent and the other plant iron supply agents.

As the biodegradable binder, a biodegradable plastic can be used. Biodegradable plastics include polybutylene succinate-based resin, polylactic acid-based resin, urea resin, poly-strength prolatatone-based resin, cellulose-based resin, starch-based resin, and polybut alcohol. And the like. These may be used alone or in combination of two or more.

 The content of the biodegradable binder is not particularly limited. However, when the total amount of the iron supply agent for plants and the other iron supply agent for plants is 100% by mass, 10% by mass or less (more preferably 2 to 7% by mass, usually 1% by mass or more).

 [0028] Further, the plant iron supply agent and the other plant iron supply agents may contain a biodegradable extender. The biodegradable extender is a component other than the above binder having biodegradability. Examples of this biodegradable bulking agent include rice husk, snow flora, rice bran, shochu, sake lees, taenic acid lees, straw, peat, humus, chicken manure, compost, cow manure and bone meal. These may be used alone or in combination of two or more. The biodegradable extender may or may not have a predetermined function for plants. Examples of the component having a predetermined function include components that serve as nutrients for plants.

 The content of the biodegradable extender is not particularly limited, but it is 50 to 94% by weight (preferably 70% when the total amount of the iron supply agent for plants and other iron supply agents for plants is 100% by weight). ~ 94 mass%). Within this range, an appropriate amount can be mixed even when a small amount of plant iron supplier is mixed with a large amount of soil.

 [0029] The plant iron supply agent and the other plant iron supply agents may contain other components in addition to the biodegradable binder and the biodegradable extender. Other components include lipoic acid, oryza oil, various vitamins, Mn, Zn, Cu, Cr, Si, Mg, Ca, Co, Mo, Ni, B, etc. (for example, metallic state, metallic Acid compounds), and compounds such as S and C1. These may be used alone or in combination of two or more. The other ingredients are 10 parts by mass or less when the total of the biodegradable binder and biodegradable extender contained in the plant iron supplier and other plant iron supplier is 100 parts by mass. It is preferable that

 [0030] The method for using the plant iron supply agent and the other plant iron supply agents is not particularly limited.

For example, if it is in liquid form, spray it (irrigate the soil, the root of the target plant, foliar spray, etc.) or immerse it (use it as a culture solution for hydroponics, soak the root of the target plant, etc.) , And use method such as mixing with soil. If solid, mix with soil (powder, lump), spread on soil (powder), fill in soil (powder, lump), etc. The usage method is mentioned.

 [0031] (4) Still another iron supply agent for plants using a biodegradable extender as a matrix

In addition to other biodegradable extenders, peat and Z or clay are contained in the other iron supply agents for plants using a biodegradable extender as a matrix. These biodegradable extenders are water-repellent, and when this other plant iron supply is used in alkaline soil, it can be used as an aqueous solution with a high pH from the surroundings. As the pH is kept low, the decrease in solubility of FeO is suppressed, and the acidity of Fe ²⁺ ions is further suppressed. Therefore, Ru can be supplied to prolonged connexion stable Fe ²⁺ ions. That is, excellent sustained release properties can be imparted by the present other iron supply agent for plants.

 [0032] Further, this other iron supply agent for plants includes a biodegradable extender having water repellency, peat and Z, or a granule containing ascorbic acid and an iron component in a matrix having clay power. Become. The shape of the particles constituting the granular body is not particularly limited, and may be any of a sphere, an ellipsoid, a hemisphere, a cube, a cuboid, a cylinder, a plecket, and the like. Further, the granular body may be a dense body or a porous body. In addition, the particle size (diameter in the case of a sphere, maximum interstitial dimension in the case of other shapes) is preferably 50 mm or less (more preferably 10 mm or less, further preferably 6 mm or less, usually 0.5 mm or more).

[0033] Furthermore, in this other iron supply agent for plants using a biodegradable extender as a matrix, ascorbic acid, FeO contained as an iron component, and peat and / or clay as biodegradable extenders. total is 100% by weight, Asukorubin acid is contained 1 to 30 wt%, FeO is preferably are contained 1-30 wt _^0/0. The content of this ascorbic acid is more preferably 3 to 20% by mass, particularly preferably 7 to 13% by mass. The content of FeO is more preferably 3 to 20% by mass, particularly preferably 7 to 8% by mass. . Thus, reduction in the solubility of FeO is sufficiently suppressed, and the oxidation of Fe ²⁺ ions is more sufficiently suppressed, prolonged connexion can be stably supplied to Fe ²⁺ ions.

[0034] As described above, the water-repellent biodegradable extender suppresses the contact of iron components such as ascorbic acid and FeO with the external environment, thereby further reducing other plant iron supply agents. When used in Al soil, the increase in pH inside the granular material is suppressed. This suppresses the decrease in the solubility of FeO. Furthermore, the acid of ascorbic acid due to oxygen in the air As a result, the effect of ascorbic acid on the suppression of the acid content of iron components such as FeO can be obtained, and Fe ²⁺ ions can be supplied more stably over a long period of time.

 [0035] There are no particular limitations on the method of using this other iron supply agent for plants using a biodegradable extender as a matrix. For example, it can be mixed with the soil (in powder form or in a lump form), sprayed on the soil (in powder form), or embedded in the soil (in powder form or lump form).

 [0036] [4] Method for producing plant iron supply agent for alkaline soil

 (1) Production method of plant iron supply agent for alkaline soil of the present invention

 The production method of the present invention is not particularly limited as described above, and various methods can be used. For example, by heating a mixture containing ascorbic acid powder, iron component powder, and water, A dissolution step for obtaining an aqueous solution obtained by dissolving ascorbic acid and an iron component can be provided.

 [0037] The "ascorbic acid powder" is a powder containing ascorbic acid as a main component (usually having a purity of 99% or more), and the purity is not particularly limited. Moreover, when it is a powder form, the particle shape etc. are not specifically limited.

 The “iron component powder” is a powder mainly composed of the various iron components. This iron component powder is preferably FeO powder. When the iron component powder is FeO powder, the amount of FeO contained in the FeO powder is not particularly limited, but usually FeO is 50 mass% or more (preferably 65 mass% or more, preferably 100 mass% or more based on the entire FeO powder). It may be mass%). This FeO powder can be any type of FeO powder. The FeO powder described later (a granulated product obtained by granulating iron-containing dust (hereinafter sometimes referred to as “dust”), and Z or A granulated product obtained by granulating this dust and a reducing agent, FeO powder obtained by vacuum heating and vacuum quenching), and various commercially available FeO powders can be used. Among these, FeO powder obtained by heating the granulated product in a vacuum and then quenching in a vacuum is preferable.

 As the “water”, any water can be used as described above.

[0039] The amount of ascorbic acid powder and iron component powder such as FeO powder and water charged in the above "mixture" is not particularly limited, but ascorbic acid powder (assuming purity 100%): iron component powder (purity 100 (Assuming%): The mass ratio of water (assuming purity of 100%) is preferably 60-90: 7-28: 3-20, 65-85: 10-24: 5-17 Use at a rate of 5 It is particularly preferable to use it at a ratio of 68-72: 10-22: 10-15.

[0040] The above mixture may or may not contain other components besides ascorbic acid powder, iron component powder and water. When other components are contained, they may be contained in a state dissolved in water or in a state not dissolved in water. Examples of other components include methanol and ethanol. By containing these, water can be removed more smoothly even under a reduced pressure environment. These may contain only one kind or two or more kinds.

[0041] The heating conditions in the above "heating" are not particularly limited, but the heating temperature is preferably maintained at 120 ° C or lower. This is because the Fe ³⁺ ion concentration tends to increase above 120 ° C. The temperature of the aqueous solution by this heating is more preferably 110 ° C. or less, more preferably 105 ° C. or less, and further preferably 100 ° C. or less. On the other hand, the lower limit temperature is not particularly limited. For example, 40 ° C or higher is preferable, 50 ° C or higher is more preferable, and 60 ° C or higher is particularly preferable. The upper limit temperature and the lower limit temperature at the time of heating can be combined. That is, for example, 40 to 120 ° C is preferable, and 50 to 110 ° C is more preferable, and 60 to 100 ° C is more preferable. Combinations other than these may be used. The pressure conditions for heating are not particularly limited.

This heating is dissolved in more water Asukorubin acid, which in accordance with the amount of dissolved TetsuNaru components such as FeO even more, even Noto consider the concentration of Fe ²⁺ ions or Fe ²⁺ ion complex of interest is higher It is done.

 [0042] The production method of the present invention can include a step of removing the water-insoluble component after the dissolution step. Examples of the water-insoluble component include ascorbic acid powder that cannot be dissolved and iron component powder that cannot be dissolved. The removal method is not particularly limited, but can usually be performed by filtration. That is, a filtration step can be provided. The filtration conditions at this time are not particularly limited. For example, it is preferable to use a membrane filter having a pore size of 10 m or less (more preferably 5 μm or less, more preferably 3 μm or less) as the filtration filter.

[0043] Further, when obtaining the other iron supply agent for plants, a drying step for removing water from the aqueous solution is further provided after the dissolution step or after the dissolution step and the filtration step. I can. The drying conditions in this drying step are not particularly limited, and natural drying may be performed, but it is preferable to use the above-described removal method and drying conditions. That is, it is preferable to remove water by heating under reduced pressure. By heating and gradually reducing the water content, Fe ²⁺ ion components (Fe ²⁺ complex, etc.) that are water-soluble and have excellent acid-fast properties are concentrated, and other plant iron suppliers Is considered to be obtained.

[0044] Further, when obtaining the other iron supply agent for plants, a purification step may be further provided. The purification process is a process for purifying water-soluble components. That is, for example, extraction is performed by removing the water-insoluble components in the same manner as described above after contacting the iron supply agent for plants obtained by removing water from the aqueous solution with water to dissolve the soluble portion. A step and a re-drying step for removing water from the extraction aqueous solution obtained in this extraction step.

[0045] (2) A method for producing an iron supply agent for an alkaline soil plant according to the present invention, wherein the biodegradable extender is used as a matrix.

 There are no particular limitations on the method for producing the other iron supply agent for plants using the biodegradable extender as a matrix. For example, biodegradable extenders having water repellency (usually powder or granules). ) Peat and Z or clay, ascorbic acid powder, and iron component powder are mixed and granulated.

 The mixing method is not particularly limited, and it may be mixed by a dry kneader using a mortar mixer, an omni mixer or the like, or a kneader or a wet pan. Furthermore, the granulation method is not particularly limited, but it is usually granulated by an extrusion method. Further, it is preferable that mixing and granulation are continuously performed by extrusion molding because the process can be simplified. The temperature of the dry blending and extrusion molding is not particularly limited, and it may be room temperature (for example, 15 to 35 ° C) or may be heated to about 40 to 90 ° C if necessary! /.

 About this ascorbic acid powder and iron component powder, each description in the manufacturing method of the above-mentioned (1) iron supply agent for plants of this invention is applicable as it is. However, when the total of FeO powder blended as peat and / or clay, ascorbic acid powder and iron component powder is 100 mass%, ascorbic acid powder is 1-30 mass%, FeO powder is 1-30 mass%. It is blended in mass%.

Still other plant iron supplies include peat and Z or clay and the other plant iron supplies. It can also be obtained by mixing with a feed agent and granulating. The mixing and granulation at this time can be performed in the same manner as described above.

 In addition, when the above-mentioned other iron supply agent for plants is used, the mass proportions of peat and / or clay, ascorbic acid powder, and FeO powder are the same as above, and this mass proportion is the same as that of other plants. It can be adjusted according to the mass ratio of ascorbic acid powder and FeO powder used in the production of iron supplements and the mass ratio of peat and / or clay and other iron supplements for plants. .

 [0046] (3) Method for producing FeO powder

 When FeO powder is used as the iron component powder in the production method of the present invention and other production methods of the present invention, this FeO powder is a granulated product obtained by granulating dust containing iron, and Z Or, it is preferable to use a FeO powder obtained by vacuum-cooling a granulated product obtained by granulating this dust and a reducing agent.

 [0047] In addition to FeO, this FeO powder is usually CaAl O, FeAl O, CaFe Si O, CaSi.

 2 4 2 4 2 2 6

Contains at least one double oxide of O and MgFe 2 O. These double oxides

2 5 2 4

 May contain only one kind or two or more kinds. The content of the double oxide is preferably 0.5 to 10% by mass when the entire FeO powder is 100% by mass. Within this range, it is possible to obtain an iron supplier that is particularly excellent in acid resistance.

 Further, the particle diameter of the particles constituting the FeO powder is not particularly limited, but may be any FeO powder having a particle diameter force of 000 μm or less and a mixture of powders having various particle diameters. Furthermore, porous particles may be included.

[0048] The "dust containing iron" is one containing iron (dust collection powder or the like). Examples of the iron component include iron oxide, other iron compounds, and metallic iron. These may contain only one kind or two or more kinds. The amount of iron contained in the dust is not particularly limited, but usually 30% by mass or more (more preferably 35 to 90% by mass, still more preferably 40 to 80% in terms of metallic iron when the total dust is 100% by mass. Mass%). Further, the dust may contain other components besides iron. Other components include Zn, Ni, Cu and Mn. These may be simple metals or compounds such as oxides. Furthermore, these may contain only 1 type, and may contain 2 or more types. The shape of the dust containing iron is not particularly limited, and may be small pieces or a mixture of powder and small pieces, but is usually powder. The average particle size of this powder is not particularly limited

3 to: LO / z m is preferable.

 [0049] Examples of the dust containing iron include forged shot dust collected in the forging process and steelmaking dust such as electric furnace dust, blast furnace dust, converter dust, and cupola dust generated in the steel making process. These may be used alone or in combination of two or more. In particular, dust from which the chlorine content has been removed by washing with water (partially or entirely) is preferred. In particular, the chlorine content in the dust is preferably 0.5% by mass or less (more preferably 0.4% by mass or less, and still more preferably 0.3% by mass or less).

 [0050] The above "granulated product" contains iron-containing dust or the dust and a reducing agent. Granulation reduces or converts Fe O, Fe 2 O and Fe (single) to FeO or acid during vacuum heating

 2 3 3 4

 Is promoted.

 The shape of the particles constituting the granulated product is not particularly limited, and may be any of a sphere, an ellipsoid, a hemisphere, a cube, a cuboid, a cylinder, a plecket, and the like. Further, the granulated product may be a dense body or a porous body. Further, the particle size (diameter in the case of a sphere, shortest dimension in the case of other shapes) is preferably 25 mm or less (more preferably 15 mm or less, further preferably 10 mm or less, usually 3 mm or more).

[0051] The "reducing agent" is a component that reduces an iron compound that has been oxidized to a valence of 2 or more. As the reducing agent, metallic iron, a mixture thereof, carbon, a mixture thereof, or the like can be used. In particular, reducing agents used for iron cutting scraps, iron polishing scraps, iron powder, pig iron and steel, various waste materials (tire scraps, wood waste materials, etc.) and the like are preferable. These may be used alone or in combination of two or more.

 The shape of the reducing agent is not particularly limited, but it is preferable that the contact area with the dust is large, so that powder, granules, small pieces, etc. are particularly preferable. Furthermore, the average particle size is preferably 200 m or less (preferably 180 μm or less).

The content of the reducing agent in the granulated product is not particularly limited, but when the dust is 100 parts by mass, it is 100 parts by mass or less (more preferably 90 parts by mass or less, more preferably 80 parts by mass or less, usually 30 parts by mass). More than part). [0052] Further, the granulated product usually contains noinda. The type of binder is not particularly limited, but alumina cement is preferable. The blending amount is 3 to 20 parts by mass (more preferably 3 to 15 parts by mass, further preferably 3 to 12 parts by mass) when the dust containing iron content or the total of the dust and the reducing agent is 100 parts by mass. Part). In this range, granulation can be performed smoothly and embrittlement of the granulated product can be suppressed.

 [0053] By performing the "vacuum heating", the FeO concentration in the FeO powder can be increased. The degree of vacuum during this vacuum heating is not particularly limited, but is preferably 0.1 to 13.3 kPa (more preferably 2.6-13. 3 kPa, particularly preferably 4.0 to 6.7 kPa). Within this range, it is possible to effectively suppress residual metallic iron and oxidation of FeO to Fe 2 O and the like. This vacuum atmosphere

 3 4

 In an inert gas atmosphere with an oxygen partial pressure equivalent to the oxygen partial pressure in the atmosphere, it is possible to obtain a FeO powder with a high FeO concentration by heating in the same manner instead of vacuum heating.

[0054] The heating temperature (measured value obtained by measuring the granulated product itself) during vacuum heating is preferably 600 to 1100 ° C (more preferably 800 to 950 ° C). However, when the granulated product contains a reducing agent, it is preferably 800 ° C or higher. In this range, FeO powder having a particularly high FeO content can be obtained, and it is possible to prevent melting of iron-containing dust during the heating process.

 The heating time is not particularly limited, but is preferably 30 minutes or longer (more preferably 30 minutes or longer and within 6 hours).

 When zinc oxide or the like is contained in the dust, it is reduced to metal zinc, which can be recovered by evaporation under a vacuum of 600 ° C or higher and about 1.556 kPa. This can further improve the purity of FeO.

[0055] The granulated product is usually heated using a heat treatment furnace. The heat treatment furnace is not particularly limited as long as it includes at least a heater and can uniformly heat the granulated product to be charged. Examples of the heat treatment furnace include a roller hearth furnace and a rotary kiln. The granulated product is powdered by, for example, a stirring means equipped with a stirring blade while moving in the heat treatment furnace. This heat treatment furnace may be equipped with a recovery device for recovering metallic zinc and the like produced by the reduction. The amount of granulated product input to the heat treatment furnace is not particularly limited し Considering heat conduction to the entire granulated product heated in the 1S heat treatment furnace, the average height of the granulated product sprayed on the hearth is Usually, it is 100mm or less, especially 80mm or less, and 30mm or less. It is preferable that it is an amount.

 [0056] By the above "vacuum quenching", the high-temperature FeO powder produced by vacuum heating can be cooled without being oxidized. The degree of vacuum during this vacuum quenching is not particularly limited, but is preferably 13.3 kPa or less (more preferably 6.7 kPa or less, usually 5.3 kPa or more). The temperature drop rate is not particularly limited, but is preferably 5 to 150 ° CZ. In this vacuum quenching, it is preferable to cool to 300 ° C or lower (more preferably 200 ° C or lower, particularly preferably 150 ° C or lower).

 [0057] In particular, for the purpose of obtaining FeO powder having a higher FeO content, it is preferable to use a granulated product containing metallic iron. The content of metallic iron is preferably 5% by mass or more (more preferably 5 to 85% by mass, still more preferably 8 to 50% by mass) when the total amount of iron contained in the granulated product is 100% by mass. . When this granulated product is used, for example, an FeO powder having a FeO content of 80 mass% or more (more preferably 85 mass% or more, particularly 90 mass% or more) based on the total iron content can be obtained.

 [0058] Dust containing iron that constitutes a granulated product containing metallic iron as described above [(1) and (5)] and a combination of this dust and a reducing agent [(2), (3 ) And (4)]: (1) Forged shot dust collection powder only, (2) Mixture of forged shot dust collection powder and metal iron (iron powder, etc.), (3) Electric furnace dust and metal iron (iron powder) Etc.), (4) mixture of blast furnace dust and metallic iron (iron powder, etc.), and (5) converter dust only. These may be used alone or in combination of two or more.

 Example

 [0059] The present invention will be specifically described below with reference to examples.

 [l] Manufacture of FeO powder

Fe80 mass _^0/0 (hereinafter,% abbreviated.), ZnO. 02%, CaO. 01%, MnO. 06% and SiO. 06% or the like is contained, forging shot dust collecting an average particle diameter of 100 m It was granulated into a cylindrical shape having a diameter of 8 mm and a length of about 20 mm using 82% of powder, 10% of iron powder having an average particle diameter of 75 m, 5% of alumina cement, and 3% of bentonite. The obtained granulated product was heated in a vacuum heating tank (roller and hearth furnace) at 800 ° C. for 30 minutes, then at 850 ° C. for 30 minutes, and then at 900 ° C. for 1 hour.

Next, vacuum quenching is performed in a vacuum quenching bath to 400 ° C at a temperature drop rate of 20 ° CZ, and further vacuum The atmosphere in the cooling tank was replaced with nitrogen, and further cooled to 200 ° C at a rate of temperature decrease of 13 ° CZ, and then cooled to room temperature to obtain FeO powder.

 When FeO contained in this FeO powder was quantified by a calibration curve prepared in advance by X-ray diffraction using a mixed powder obtained by mixing a reagent FeO powder and silicon powder at a predetermined ratio, the content was It was 90% by mass.

[0060] [2] Stability of Fe ²⁺ ions in iron ascorbate aqueous solution

 Experimental example 1-3

(1) Correlation between pH of iron ascorbate aqueous solution and Fe ²⁺ ion concentration

 An aqueous solution of ascorbic acid was prepared by dissolving 2.5 g of ascorbic acid in 500 ml of distilled water. Thereafter, 1. Og of the FeO powder produced in [1] above was added to this aqueous solution, stirred for 30 minutes, and then filtered to remove impurities. Thereafter, 20 milliliters are taken from the aqueous solution after filtration and put into 5 containers, and ρΗ of the aqueous solution in 4 of these containers is 7.0, respectively, with sodium hydroxide aqueous solution. Adjusted to 8.0 and 9.0. The pH of the ascorbic acid aqueous solution not adjusted for pH was 3.4.

[0061] For three types of ascorbic acid aqueous solutions having different pH values prepared as described above, each Fe ²⁺ ion at the time of aqueous solution preparation or pH adjustment, and after 24 hours, 48 hours, and 120 hours, respectively. Concentration was measured. In addition, the pH of each aqueous solution was also measured. The Fe ²⁺ ion concentration was measured by a phenantorin phosphorus absorptiometry based on IS K0102. In this measurement, the work was always performed in a room where direct sunlight was not inserted. The results are listed in Table 1.

[0062] [Table 1]

According to the results in Table 1, it can be seen that in all of Experimental Examples 13 and 3, the pH tends to decrease with time, and the Fe ²⁺ ion concentration is maintained at a high concentration. Ascorbic acid is acidified under alkaline conditions to form dehydroascorbic acid. The pH of the FeO solution is considered to have decreased, and the solubility of FeO increases as the pH decreases, so that more FeO dissolves in water and reductive ascorbic acid converts Fe ²⁺ to Fe ³⁺ . Oxidation is suppressed, and these synergistic effects are considered to maintain the Fe ²⁺ ion concentration at a high concentration even when the initial pH is high.

[0064] (2) Fe ²⁺ ion concentration when adjusting pH of aqueous solution after 120 hours in (1) above

 Experimental examples 4-6

For each of the three types of aqueous solutions with different initial pH values in (1) above, after 120 hours each, the lowered pH was adjusted to an approximate value for the initial pH with aqueous sodium hydroxide solution, and each Fe ²⁺ The ion concentration was measured. In addition, since the pH of each aqueous solution adjusted for pH decreased again in 24 hours, the pH was adjusted again to a value close to the initial pH with sodium hydroxide aqueous solution, and the respective Fe ²⁺ ion concentrations were measured. did. This pH adjustment and measurement of each Fe ²⁺ ion concentration were repeated three times. The results are listed in Table 2.

[0065] [Table 2]

α

Adjusting Adjusting Adjusting Time 1st Time H 3 H 2 H 1 pt— 2 ^{22 +++} Concentration Concentration Concentration Concentration Concentration Concentration Concentration

 () / Lito / J To / To!)) Rururu, tsutsu mgmgmg

/ εοios6, ~ o '*

X

 a

Example 4 of pH adjustment in 6 1 Each value of pH and Fe ion concentration in the second time is the value at the time of pH adjustment (initial value), and the value of ZpH adjustment power is also a value after 24 hours. In the third pH adjustment, only the initial value was measured.

[0066] According to the results in Table 2, when pH is repeatedly adjusted to the alkaline region, the force that tends to decrease the Fe ²⁺ ion concentration in the region where the pH is higher. The pH decreases with time, and the Fe is sufficiently high. it can be seen ^{tendency 2+} ion concentration is maintained is the same as in the above (1).

[0067] [3] Manufacture and evaluation of plant iron supply agent for alkaline soil (Part 1)

 Experimental Example 7

(1) Plant iron supply agent for alkaline soil (A) 10% ascorbic acid (purity 99.8% or more), 7.5% FeO powder produced in [1] above, and 82.5% peat processing soil conditioner (trade name, manufactured by Nippon Fertilizer Co., Ltd.) “Kumiai Hyphen” (special name A)) was mixed and granulated by extrusion to produce a roughly spherical spherical iron supply agent (A) for alkaline soil plants.

[0068] (2) Evaluation of plant iron supply agent for alkaline soil

 (A) Rice growth

 In each of the five pots for cultivation, the following seedling culture soil was introduced, and the seedlings of rice (variety: Japan sunny day) that had been germinated using a petri dish were planted after 3 days, and grown using an artificial meteorological device. The growth promoting action and effect of the plant growth promoter (A) was evaluated. Raising soil for seedlings (a); 100 parts by mass of fossil shellfish soil containing about 70% by mass of CaCO

 Three

 Abbreviated as part. ) And fertilizer (made by Chisso Asahi Fertilizer Co., Ltd., trade name “Long Total 70”)

 Seedling culture soil (b); 100 parts of the fossil shell soil was mixed with 1 part of the fertilizer and 0.1 part of the plant iron supply agent (A).

 Seedling soil (c); 100 parts of the fossil shell soil was mixed with 1 part of the fertilizer and 1 part of the plant iron supply agent (A).

 Artificial meteorological device (manufactured by Nippon Medical Instrument Co., Ltd., model “LH-100S”) adjusts sunshine for 14 hours (light intensity is 1500 lux, temperature is 25 ° C) and night time is 10 hours (temperature is 20 ° C). And drove. In addition, water was only replenished by evaporation. In other words, operating conditions were set to simulate growth of upland rice in alkaline soil.

[0069] (B) Evaluation results

Fig. 1 is an explanatory diagram based on images obtained by digital photography 10 days after germination of the growth of each seedling in the growth of rice in (A) above ((a), (b) in Fig. 1) And (c) show the results of using the above seedling culture soil (a), (b) and (c), respectively. ] According to this explanatory diagram, in the case of (b) using the plant iron supply agent (A) for alkaline soil, only fertilizer is blended even though the blending amount is as small as 0.1 part. It can be seen that the seedlings are growing taller than (a). In addition, in (c) where the blending amount of the iron supply agent for plants for alkaline soil (A) is 1 part, the seedlings are particularly taller than (b). You can see that it grows well.

 There was also a clear difference in the color tone of each seedling, and the green strength of the seedlings was stronger in the order of (a) to (b), especially (c). This suggests that the amount of chlorophyll is higher.

[0070] [4] Manufacture and evaluation of plant iron supply for alkaline soil (Part 2)

 Experimental examples 8-16

 (1) Plant iron supply agent for alkaline soil (B)

 The plant iron supply agent for alkaline soil (A) produced in [3] and (1) above is opened 1. Pass through an Omm sieve and have a particle size of 1. Omm for plant iron supply for alkaline soil ( B) was obtained.

(2) Plant iron supply agent for alkaline soil (C)

 Ascorbic acid (purity 99.8%) 800 g and 2 liters of water were put into a stainless steel beaker and stirred at room temperature (20 ° C) to dissolve ascorbic acid in water. Thereafter, 100 g of the FeO powder produced in [1] above was added, and stirring was continued for another 30 minutes. Next, this FeO powder dispersion was filtered using a filter paper, and the filtrate was dried for 72 hours by a drier adjusted to 90 ° C. Thereafter, the obtained paste-like material is cooled to room temperature to form a lump, which is sufficiently pulverized in a mortar, then passed through a sieve with an opening of 1. Omm, and an alkaline soil having a particle size of 1. Omm or less. An iron supply agent for plants (C) was produced.

[0071] (2) Evaluation of plant iron supply agent for alkaline soil

 (A) Rice growth

 The following seedling culture soil was added to each of the cultivation pots, and 20 seeds of rice (variety: Nihonbare) sprouting using a petri dish were directly sown. The cocoons were embedded in the soil at a depth of about 0.5 cm from the surface. Then, it was grown using an artificial meteorograph, and the growth promoting action and effect of the above-mentioned plant iron supply agent (A) and the above-mentioned plant iron supply agents (B) and (C) were evaluated.

[0072] The seedlings were grown using an artificial meteorological instrument (manufactured by Nippon Medical Instrumentation, model “LH-100S”). The artificial meteorograph was operated with sunshine adjusted to 14 hours (light intensity 1500 lux, temperature 25 ° C) and night time 10 hours (temperature 20 ° C). In addition, 50 ml of distilled water added to 300 ml of shell fossil soil was used as the field capacity, and irrigated so that the total weight of the pot and contents was maintained at OOg every day throughout the growing period. In addition, 13 pots throughout the growing period The position was changed randomly every day so that the illumination (sunshine) was evenly irradiated.

 Experimental Example 8: Fertilizer (manufactured by Chisso Asahi Fertilizer Co., Ltd., trade name “Long Total 70”) lg was blended in the shell fossil soil in the pot to prepare a seedling culture soil.

 Experimental Example 9: The fertilizer lg and the ferrous fertilizer for alkaline soil (A) (in Table 1, “A” in the column of type and “granule” in the column of property) in the shell fossil soil in the pot. The same shall apply hereinafter.) 0. lg was added to prepare a seedling culture soil.

 Experimental Example 10: The fertilizer lg and the ferrous fertilizer for alkaline soil (B) above the shell fossil soil in the pot (B in the type column and B in the property column and powder in the property column) The same shall apply hereinafter.) 0. lg was added to make a seedling culture soil.

 Experimental Example 11: The above fertilizer lg and the above-mentioned fertilizer for plant for alkaline soil (A) l.Og were blended with the fossil shell soil in the pot to prepare a seedling culture soil.

 Experimental Example 12: The above fertilizer lg and the above-mentioned fertilizer for plant for alkaline soil (B) l.Og were blended with the fossil shell soil in the pot to prepare a seedling culture soil.

 Experimental Example 13: The above-mentioned fertilizer lg and the above-mentioned fertilizer for plant for alkaline soil (A) 2. Og were blended with the fossil shell fossil soil in the pot to prepare a seedling culture soil.

 Experimental Example 14: The above-mentioned fertilizer lg and the above-mentioned fertilizer for plant for alkaline soil (B) 2. Og were blended with the fossil shell fossil soil in the pot to prepare a seedling culture soil.

 Experimental Example 15: Fertilizer lg and shell fertilizer for alkaline soil (C) (in Table 1, C in the type column and powder in the property column) The same shall apply hereinafter.) 0. lg was added to make a seedling culture soil.

 Experimental Example 16: The above-mentioned fertilizer lg and the above-mentioned fertilizer for plant for alkaline soil (C) l.Og were blended with the fossil shell fossil soil in the pot to prepare a seedling culture soil.

[0074] The seedlings were grown as described above, photographed 54 days after direct seeding of the pods, and harvested. Prior to harvesting, the plant height of 20 seedlings in each pot was measured. Further, the SPAD value (green density, which is an index of the amount of chlorophyll) was measured using a chlorophyll meter (model “SPAD-502” manufactured by Minolta Co., Ltd.). Sift the root soil at harvest, then dry for 7 days, then screen the root soil again to remove almost the entire amount, then take a picture and take the dry weight of the above ground and the dry weight of the root. (Total of dry root weight and weight ) Was measured.

 The results are shown in Table 3 and FIG.

 Regarding the plant height and SPAD value of seedlings, the average value and standard deviation of 20 seedlings in each pot are described.

[Table 3]

[0076] (B)評価結果

[0076] (B) Evaluation result

 According to Experimental Examples 9 and 10, except for the SPAD value in Experimental Example 10, the results are better than in Experimental Example 8 in which no plant iron supplier was administered (Figures 2, 3, and 7). And 8). Further, in Experimental Examples 9 and 10, it is desirable to administer more plant iron supply agents that are not sufficiently promoted in growth compared with Experimental Examples 11 to 14.

 [0077] According to Experimental Examples 11 and 12, the above-ground dry weight and root dry weight are the same (see Figs. 2, 3 and 9), but in Experimental Example 12, the dispersion of SPAD values is small (standard deviation value is Low) Stable. In other words, it is presumed that the amount of iron dissolved in the soil is higher when administered as powder than granules, and the variability between seedlings that easily come into contact with the roots of each seedling is reduced. On the other hand, according to Experimental Examples 13 and 14, the above-ground dry weight and SPAD values are similar, but in Experimental Example 14, the plant height is slightly lower than in Experimental Example 13. This may be due to the fact that even in the same dose of 2 g, iron 14 is too much dissolved and slightly excessive in Experimental Example 14, which is a powder. However, it does not appear to exhibit necrosis, an iron overload (see Figures 2 and 5). In Experimental Examples 11 and 12, the dry weight of the root part is almost equal to the dry weight of the root part, even though the dosage is half that of Experimental Examples 13 and 14. 12 is much better (see Figure 7). This suggests that the dose of plant iron supply (B) is excessive at 2 g.

 [0078] In Experimental Example 16, both the plant height and SPAD value are the best among the experimental examples.

 (See Figures 2 and 6.) Compared with Experimental Example 16, in Experimental Example 15 where the dose of plant iron supplier (C) is 1Z10, plant height, SPAD value, aboveground dry weight and root dry weight all decreased. (See Figures 2, 6, 7 and 11). Therefore, it is assumed that the supply of iron is not sufficient at the dose of Experimental Example 15. On the other hand, in Experimental Example 16, there is no iron overload, and therefore growth may be further promoted when a higher amount of the plant iron supply agent (C) is administered.

In Experimental Example 15, although the SPAD value is low, the plant height, the above-ground dry weight and the root dry weight are sufficient and excellent. This means that in Example 15, the growth of roots is equivalent to Example 16 although the dose is 1Z10 in Example 16. That is, iron should be used preferentially for root growth and then for ground growth. It is guessed how.

 [0079] It should be noted that the present invention is not limited to the description of the above-described embodiment, and various modifications can be made within the scope of the present invention. For example, a mixture obtained by mixing ascorbic acid powder and iron component powder, adding a small amount of water to the mixture, and then removing the water can be used as an iron supply agent for plants for alkaline soil. In this case, the amount of water relative to the ascorbic acid powder is not particularly limited, but is usually 5 to 20 parts by mass, more preferably 5 to 15 parts by mass with respect to 100 parts by mass of the ascorbic acid powder. On the other hand, the iron component powder can be blended in an amount of 10 to 25 parts by mass, particularly 20 to 25 parts by mass, based on 100 parts by mass of ascorbic acid powder.

 For the above ascorbic acid powder and iron component powder, the above description can be applied as it is. In addition, the water content in the solid or paste-like material obtained by using a small amount of water as described above can be set to the same level as the other iron supply agents for plants. Further, the water removal method can be the same as that for the other iron supply agents for plants, and drying under reduced pressure is preferable. In addition, the temperature at the time of heating when removing water and the pressure at which the pressure is reduced when removing water can be the same as those of other iron supply agents for plants.

 Industrial applicability

[0080] The plant iron supply agent for alkaline soil of the present invention is widely used in the field of agriculture and forestry.

 That is, for example, it is widely used for production of agricultural products, hydroponics, production of horticultural plants, maintenance of vegetation in parks and golf courses, maintenance of forests, and the like. In particular, it is useful as a plant growth promoter in the field of production of various agricultural products. Furthermore, it can be used to solve food problems caused by plant growth in barren lands around the world and to improve the global environment by promoting absorption of carbon dioxide.

Claims

 The scope of the claims  [I] An iron supply agent for plants for alkaline soil, characterized in that it is an aqueous solution obtained by dissolving ascorbic acid and an iron component.  [2] The plant iron supply agent for alkaline soil according to claim 1, wherein the iron component is metallic iron and Z or FeO.  [3] The plant iron supply agent for alkaline soil according to claim 2, wherein the iron component is FeO. [4] the iron component is FeO, when containing the Fe ²⁺ ions and Fe ³⁺ ions, and the total of the Fe ²⁺ ions and the F e ³⁺ ions is 100 mass _^0/0 , alkaline soil for plant for iron supply agent according to claim 1 wherein the Fe ²⁺ ions Ru 50-99 mass _^0/0 der. [5] The iron component is FeO, and the Fe ²⁺ ion concentration of the aqueous solution is measured in the region where the hydrogen ion exponent is 7.0 or more, and then the aqueous solution is allowed to stand for 120 hours, and again Fe ²⁺ The plant iron supply agent for alkaline soil according to claim 1, wherein the concentration after standing is 80% or more of the concentration before standing when the ion concentration is measured. 6. The plant iron supply for alkaline soil according to claim 1, comprising a biodegradable binder. [7] The plant iron supply agent for alkaline soil according to claim 1, comprising a biodegradable extender. [8] An iron supply agent for alkaline soil plants characterized by removing aqueous solution water obtained by dissolving ascorbic acid and an iron component. [9] The plant iron supply agent for alkaline soil according to claim 8, wherein the iron component is metallic iron and Z or FeO.  10. The plant iron supply agent for alkaline soil according to claim 9, wherein the iron component is FeO. [II] The iron component is FeO, and the aqueous solution obtained by dissolving the plant iron supply agent for alkaline soil contains Fe ²⁺ ions and Fe ³⁺ ions, and the Fe ²⁺ ions and the Fe If the sum of the ³⁺ ions was 1 00 wt%, for plants iron supplying agent for § alkaline soil according to claim 8 wherein the Fe ²⁺ ion is 50 to 99 mass%. [12] The Fe ²⁺ ion concentration of the aqueous solution in which the iron component is FeO and the plant iron supply agent for alkaline soil is dissolved is measured in the region where the hydrogen ion index is 7.0 or more. The alkaline soil plant according to claim 8, wherein the aqueous solution is allowed to stand for 120 hours, and when the Fe ²⁺ ion concentration is measured again, the concentration after standing is 80% or more of the concentration before standing. Iron supply agent [13] The plant iron supply agent for alkaline soil according to claim 8, which contains a biodegradable binder. [14] The plant iron supply agent for alkaline soil according to [8], comprising a biodegradable extender. [15] An iron supply agent for plants for alkaline soil, characterized in that it consists of granules containing ascorbic acid and iron components in a peat and / or clay matrix. [16] Fe contained as peat and / or clay, ascorbic acid and iron component When the total amount of O is 100% by mass, the ascorbic acid is 1 to 30% by mass, and the Fe The plant iron supply agent for alkaline soil according to claim 15, wherein O is 1 to 30% by mass. [17] A dissolving step is provided in which a mixture containing ascorbic acid powder, iron component powder, and water is heated to obtain an aqueous solution obtained by dissolving the ascorbic acid powder and the iron component powder. The manufacturing method of the iron supply agent for plants for alkaline soil characterized by the above-mentioned. 18. The method for producing an iron supplier for an alkaline soil plant according to claim 17, wherein the iron component powder is iron powder and Z or FeO powder. [19] The method for producing an iron supply agent for a plant for alkaline soil according to [18], wherein the iron component powder is FeO powder.  [20] The method for producing an iron supply agent for a plant for alkaline soil according to claim 17, wherein the aqueous solution power also includes a drying step of removing water. [21] The FeO powder is obtained by vacuum-heating a granulated product obtained by granulating iron-containing dust and a granulated product obtained by granulating Z or iron-containing dust and a reducing agent. 20. The method for producing an iron supply agent for a plant for alkaline soil according to claim 19, wherein the FeO powder is obtained by vacuum quenching.  [22] A method for producing an iron fertilizer for a plant for alkaline soil according to claim 15,  Mix the peat and / or clay, ascorbic acid powder, and iron component powder, and then A method for producing an iron supply agent for a plant for alkaline soil, characterized by granulating. 23. The method for producing an iron supplier for an alkaline soil plant according to claim 22, wherein the iron component powder is iron powder and Z or FeO powder. 24. The method for producing an iron supply agent for plant for alkaline soil according to claim 23, wherein the iron component powder is FeO powder. [25] When the total of the peat and / or clay, the ascorbic acid powder and the FeO powder is 100% by mass, the ascorbic acid powder is 1 to 30% by mass, and the FeO powder is 1 to 30%. The method for producing an iron supply agent for an alkaline soil plant according to claim 24, wherein the method is mass%. [26] The FeO powder is obtained by vacuum-heating a granulated product obtained by granulating iron-containing dust and a granulated product obtained by granulating Z or iron-containing dust and a reducing agent. 25. The method for producing an iron supply agent for an alkaline soil plant according to claim 24, wherein the FeO powder is obtained by vacuum quenching.