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WO2025229547A1 - A fertiliser composition - Google Patents

A fertiliser composition

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Publication number
WO2025229547A1
WO2025229547A1 PCT/IB2025/054483 IB2025054483W WO2025229547A1 WO 2025229547 A1 WO2025229547 A1 WO 2025229547A1 IB 2025054483 W IB2025054483 W IB 2025054483W WO 2025229547 A1 WO2025229547 A1 WO 2025229547A1
Authority
WO
WIPO (PCT)
Prior art keywords
polyhalite
analogue
composition
fertiliser
fertiliser composition
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/IB2025/054483
Other languages
French (fr)
Inventor
Jonathan Richard Walton BROWN
Kathryn Elizabeth BARTLETT
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Anglo American Woodsmith Ltd
Original Assignee
Anglo American Woodsmith Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Anglo American Woodsmith Ltd filed Critical Anglo American Woodsmith Ltd
Publication of WO2025229547A1 publication Critical patent/WO2025229547A1/en
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
    • C05D1/00—Fertilisers containing potassium
    • C05D1/02—Manufacture from potassium chloride or sulfate or double or mixed salts thereof
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
    • C05D9/00—Other inorganic fertilisers
    • C05D9/02—Other inorganic fertilisers containing trace elements
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
    • C05D3/00—Calcareous fertilisers

Definitions

  • This invention relates to a fertiliser composition including at least one polyhalite analogous triple sulphate salt.
  • the invention extends to the use of these analogues in fertiliser compositions in agriculture to increase plant growth, in soil remediation and/or reclamation and/or recovery of contaminated land.
  • the composition may also be used as a seed coating, as a coating agent for fertilisers, as an animal food additive and/or in specialty agricultural uses including irrigation, fertigation, and hydroponic/aeroponic systems.
  • Polyhalite (K2MgCa2(SC>4)42H2O) is an evaporite mineral existing as a triple salt consisting of sulphates of potassium, magnesium and calcium. It is known in the art that polyhalite can be used effectively as a multi-nutrient fertiliser for delivering potassium, magnesium, calcium and sulphate to plants.
  • Naturally occurring polyhalite is often used as a fertiliser since it contains four important nutrients and is low in chloride.
  • the mineral polyhalite has a variety of uses, including as:
  • Soil amendment Polyhalite can help to improve the drainage, structure and/or fertility of soil.
  • Water treatment additive Polyhalite can help to remove impurities from water, such as sulphates and chlorides. It can also help to soften water and make it less corrosive.
  • Animal feed additive Polyhalite can be added to animal feed to improve the nutritional value of the feed.
  • Polyhalite can be used in a variety of industrial applications, such as making glass, soap, and paper.
  • Industrial feedstock Polyhalite has been utilised in the preparation of other industrial products, particularly in agriculture.
  • a solid fertiliser composition comprising at least one polyhalite analogue.
  • the fertiliser composition may further include polyhalite or other sulphate salts.
  • the solid fertiliser composition consists essentially of at least one polyhalite analogue. In another embodiment, the solid fertiliser composition consists of at least one polyhalite analogue.
  • Solid may mean a fundamental state of matter which possess the least amount of kinetic energy per atom/molecule relative to other phases (liquid, gas and plasma). It is a substantially non-dissolved state where the majority of salts are not in solution, for example, an aqueous solution.
  • a solid may include a paste, a gel, an oil, or an amorphous solid, including without limitation a pellet, a prill, a granule, a particle or a powder, or the like.
  • the solid fertiliser composition comprises at least one polyhalite analogue and a naturally occurring polyhalite. In one embodiment, the solid fertiliser composition consists essentially of at least one polyhalite analogue and a naturally occurring polyhalite. In another embodiment, the solid fertiliser composition consists of at least one polyhalite analogue and a naturally occurring polyhalite.
  • the polyhalite analogue is preferably ASO4 ⁇ MSO4 ⁇ 2CaSO4 2H2O where A is selected from K + and NF , and M selected from Mn 2+ , Fe 2+ , Co 2+ , Ni 2+ , Cu 2+ and Zn 2+ .
  • the polyhalite may be naturally occurring.
  • the polyhalite analogue may be synthesised.
  • the fertiliser composition may be in the form of a granule, a pellet, a powder, a suspendable powder, or a suspension of solid components in a liquid media.
  • the solid fertiliser composition may comprise: a. 50 to 99 %wt polyhalite and/or other sulphate salts; and b. 1to 50 %wt polyhalite analogue or combinations thereof.
  • sulphate salts may be selected from Potassium Sulphate, Magnesium Sulphate and Calcium Sulphate.
  • the composition may contain more than 55%wt polyhalite and/or other sulphate salts, more than 60%wt, more than 65%wt, more than 70%wt, more than 75%wt, more than 80%wt, more than 85%wt, more than 90%wt and more than 95%wt polyhalite and/or other sulphate salts.
  • the composition may contain more than 5%wt polyhalite analogue or combinations thereof, more than 10%wt, more than 15%wt, more than 20%wt, more than 25%wt, more than 30%wt, more than 35%wt, more than 40%wt and more than 45%wt polyhalite analogue or combinations thereof.
  • the composition may contain less than 95%wt polyhalite and/or other sulphate salts, less than 90%wt, less than 85%wt, less than 80%wt, less than 75%wt, less than 70%wt, less than 65%wt, less than 60%wt and less than 55%wt polyhalite and/or other sulphate salts.
  • the composition may contain less than 45%wt polyhalite and/or other sulphate salts, less than 40%wt, less than 35%wt, less than 30%wt, less than 25%wt, less than 20%wt, less than 15%wt, less than 10%wt and less than 5%wt polyhalite and/or other sulphate salts.
  • the amount of polyhalite analogue present in the fertiliser composition may be predetermined to address a deficiency (preferably known or anticipated) in an area of application, for example the addition of a manganese or iron containing analogues into a polyhalite containing fertiliser composition for the prevention of deficiency symptoms of either that may be observed in crops grown in high organic matter or high pH soils.
  • a cobalt containing analogue in small amounts to a polyhalite composition intended for use in crops such as Soya, where Cobalt is required during the fixation of nitrogen by rhizobia bacteria in nodules of leguminous plants
  • alterations to the chemical composition of the polyhalite in the fertiliser composition according to this aspect of the invention can be tailored to suit particular conditions.
  • the deficiency in an area of application of the fertiliser composition may be a mineral and/or nutrient imbalance in the area of application.
  • the area of application may be soil and/or water.
  • the invention extends to a fertiliser composition comprising at least one polyhalite analogue and a naturally occurring polyhalite.
  • the fertiliser composition may further include other sulphate salts.
  • the polyhalite analogue may be ASO4 ⁇ MSO4 ⁇ 2CaSO4 2H2O where A is selected from K+ and NH4+, and M selected from Mn2+, Fe2+, Co2+, Ni2+, Cu2+ and Zn2+.
  • the fertiliser composition may consist essentially of a polyhalite analogue and a naturally occurring polyhalite.
  • the polyhalite analogue may be synthesised.
  • the fertiliser composition may be in the form of a granule, a pellet, a powder, a suspendable powder, a suspension of solid components in a liquid media or a solution of dissolved salts in water.
  • the fertiliser composition may comprise: a. 50 to 90 %wt polyhalite; and b. 1 to 50 %wt polyhalite analogue.
  • the amount of polyhalite analogue included in the fertiliser composition may be predetermined to address a deficiency in an area of application.
  • the deficiency may be a mineral and/or nutrient imbalance in the area of application.
  • a fertiliser composition according the first aspect of the invention in soil remediation and/or reclamation and/or recovery of contaminated land.
  • the reduction of magnesium to potassium ratio may be desired in certain scenarios, where the magnesium levels in soils are already at levels in excess of the soil available potassium.
  • a fertiliser composition according to the first aspect of the invention as a seed covering, or fertiliser coating, as an animal food additive and/or in hydroponics/aeroponics.
  • a polyhalite analogue as a fertiliser.
  • composition including a polyhalite analogue for use in agriculture.
  • a method of producing a composition comprising at least one polyhalite analogue and a polyhalite, the method comprising adding the polyhalite analogue to the polyhalite.
  • the present invention relates to the application of these analogues as follows:
  • the present invention teaches a means of delivering other elements in a fertiliser by the incorporation of these polyhalite analogues at different ratios into a granule containing predominantly polyhalite, as a means of delivery of other nutrients that is not immediately obvious to those skilled in the art and would not be delivered by the addition of a polyhalite containing composition alone.
  • the invention seeks to provide an alternative delivery means of key crop nutrients via polyhalite analogue compounds incorporated into polyhalite based granules and so to provide a more optimised ratio of elements that is achievable than by polyhalite by itself.
  • the present invention teaches a means to deliver a polyhalite containing seed coating that can also incorporate micronutrient contents into the composition, whilst maintaining the overall balance of primary and secondary nutrients (Potassium, Sulphur and Calcium) found in a polyhalite composition.
  • the invention proposes to apply these compounds into an agricultural setting by applying as either an additive format into a polyhalite based granule to thereby offer a significant opportunity to optimise granule content and to include further micronutrients into a granular (or other form of product) containing polyhalite. It is noted that the prior art has existed for over 15 years without the application of the teaching above.
  • the present invention envisages a fertiliser composition which is dictated by the soil type/ composition and/or the plant to be grown.
  • An important aspect to the present invention is that the soil requirements and/or any nutrient depletion of the soil is determined before the fertiliser remediation is selected, prepared and/or applied. Effectively the fertiliser can act as a soil modifier or soil enhancer predetermined by the depletion.
  • seed/plant directed fertilisers a key prerequisite will be determining the germination/grown lifecycle of the plant. It will be appreciated that different seeds/plants require different minerals at different times during the growth lifecycle.
  • the use of the present fertiliser including the analogue can be used to regulate the needs of the seed/plant to meet growth needs.
  • the fertiliser could be added to the soil directly, provided blended with the seeds or provided as a seed coating and therefore wrapping the seed.
  • Aquaponics is considered to be a cooperation between plants and fish and the term originates from the two words aquaculture (the growing of fish in a closed environment) and hydroponics (the growing of plants usually in a soil-less environment).
  • hydroponics can be considered the technique of growing plants using a water-based nutrient solution rather than soil.
  • the present invention could therefore be included in the water-based solution of a hydroponic or aquaponic system.
  • the invention can also be used to improve the use and value of lower grade polyhalite.
  • the lower grade material may be improved by changing it to a high value analogue for use alone or with polyhalite as a fertilizer.
  • a powder polyhalite product comprising the following;
  • a granular polyhalite product comprising the following;
  • Example 2 applied in broadacre crops such as wheat of at a representative rate of 175 kg/ ha at sowing, would therefore apply the following amounts of each;
  • a granular polyhalite product comprising the following;
  • Example 3 applied into grassland at a representative rate of 250 kg/ha, would therefore supply the following amounts;
  • Example 3 teaches a composition that can be altered to conditions and provides a changed K:Mg ratio to that of an equivalent granular composition consisting of polyhalite only.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Organic Chemistry (AREA)
  • Fertilizers (AREA)

Abstract

The invention relates to a fertiliser composition including at least one polyhalite analogous triple sulphate salt. The invention extends to the use of these analogues in fertiliser compositions in agriculture to increase plant growth, in soil remediation and/or reclamation and/or recovery of contaminated land.

Description

A FERTILISER COMPOSITION
Field of the Invention
This invention relates to a fertiliser composition including at least one polyhalite analogous triple sulphate salt. The invention extends to the use of these analogues in fertiliser compositions in agriculture to increase plant growth, in soil remediation and/or reclamation and/or recovery of contaminated land. The composition may also be used as a seed coating, as a coating agent for fertilisers, as an animal food additive and/or in specialty agricultural uses including irrigation, fertigation, and hydroponic/aeroponic systems.
Background to the Invention
Polyhalite (K2MgCa2(SC>4)42H2O) is an evaporite mineral existing as a triple salt consisting of sulphates of potassium, magnesium and calcium. It is known in the art that polyhalite can be used effectively as a multi-nutrient fertiliser for delivering potassium, magnesium, calcium and sulphate to plants.
Naturally occurring polyhalite is often used as a fertiliser since it contains four important nutrients and is low in chloride.
The existence of a series of polyhalite analogue triple salts, A2MCa2(SC>4)4 ■ 2H2O, where A is selected from K+ and NF , and M selected from Mn2+, Fe2+, Co2+, Ni2+, Cu2+ and Zn2+ was reported as early as 1908. A new pale blue mineral was discovered in Chile with the form K2CuCa2(SC>4)4.2H2O which later was named leightonite and first reported in 1938. No further existence of natural polyhalite analogues has been confirmed. Polyhalite analogue triple salts, A2M2Ca2(SC>4)4.2H2O, where A is either K+ or NF , where M is substituted by Mn2+, Fe2+, Co2+, Ni2+, Cu2+ and Zn2+, have since been synthesised for characterisation purposes, but the literature is silent as to their possible use and/or application of these materials.
The mineral polyhalite has a variety of uses, including as:
• Soil amendment: Polyhalite can help to improve the drainage, structure and/or fertility of soil.
• Water treatment additive: Polyhalite can help to remove impurities from water, such as sulphates and chlorides. It can also help to soften water and make it less corrosive.
• Animal feed additive: Polyhalite can be added to animal feed to improve the nutritional value of the feed.
• Industrial applications: Polyhalite can be used in a variety of industrial applications, such as making glass, soap, and paper.
• Industrial feedstock: Polyhalite has been utilised in the preparation of other industrial products, particularly in agriculture.
Surprisingly, it has not been investigated how to utilise the difference in chemical composition of the polyhalite analogues, specifically using analogous compounds of the triple salt polyhalite, to suit industrial and agricultural conditions. A need exists for a bespoke solution where the chemical composition of the polyhalite in polyhalite containing formulations can be modified to suit particular conditions and/or applications.
Summary of the Invention
According to a first aspect to the present invention there is provided a solid fertiliser composition comprising at least one polyhalite analogue. The fertiliser composition may further include polyhalite or other sulphate salts.
In one embodiment, the solid fertiliser composition consists essentially of at least one polyhalite analogue. In another embodiment, the solid fertiliser composition consists of at least one polyhalite analogue. Solid may mean a fundamental state of matter which possess the least amount of kinetic energy per atom/molecule relative to other phases (liquid, gas and plasma). It is a substantially non-dissolved state where the majority of salts are not in solution, for example, an aqueous solution. As such, a solid may include a paste, a gel, an oil, or an amorphous solid, including without limitation a pellet, a prill, a granule, a particle or a powder, or the like.
In one embodiment, the solid fertiliser composition comprises at least one polyhalite analogue and a naturally occurring polyhalite. In one embodiment, the solid fertiliser composition consists essentially of at least one polyhalite analogue and a naturally occurring polyhalite. In another embodiment, the solid fertiliser composition consists of at least one polyhalite analogue and a naturally occurring polyhalite.
The polyhalite analogue is preferably ASO4 ■ MSO4 ■ 2CaSO4 2H2O where A is selected from K+ and NF , and M selected from Mn2+, Fe2+, Co2+, Ni2+, Cu2+ and Zn2+.
The polyhalite may be naturally occurring. The polyhalite analogue may be synthesised.
The fertiliser composition may be in the form of a granule, a pellet, a powder, a suspendable powder, or a suspension of solid components in a liquid media.
The solid fertiliser composition may comprise: a. 50 to 99 %wt polyhalite and/or other sulphate salts; and b. 1to 50 %wt polyhalite analogue or combinations thereof.
Other sulphate salts may be selected from Potassium Sulphate, Magnesium Sulphate and Calcium Sulphate.
The composition may contain more than 55%wt polyhalite and/or other sulphate salts, more than 60%wt, more than 65%wt, more than 70%wt, more than 75%wt, more than 80%wt, more than 85%wt, more than 90%wt and more than 95%wt polyhalite and/or other sulphate salts. The composition may contain more than 5%wt polyhalite analogue or combinations thereof, more than 10%wt, more than 15%wt, more than 20%wt, more than 25%wt, more than 30%wt, more than 35%wt, more than 40%wt and more than 45%wt polyhalite analogue or combinations thereof.
The composition may contain less than 95%wt polyhalite and/or other sulphate salts, less than 90%wt, less than 85%wt, less than 80%wt, less than 75%wt, less than 70%wt, less than 65%wt, less than 60%wt and less than 55%wt polyhalite and/or other sulphate salts.
The composition may contain less than 45%wt polyhalite and/or other sulphate salts, less than 40%wt, less than 35%wt, less than 30%wt, less than 25%wt, less than 20%wt, less than 15%wt, less than 10%wt and less than 5%wt polyhalite and/or other sulphate salts.
The amount of polyhalite analogue present in the fertiliser composition may be predetermined to address a deficiency (preferably known or anticipated) in an area of application, for example the addition of a manganese or iron containing analogues into a polyhalite containing fertiliser composition for the prevention of deficiency symptoms of either that may be observed in crops grown in high organic matter or high pH soils. Alternatively, the addition of a cobalt containing analogue in small amounts to a polyhalite composition intended for use in crops such as Soya, where Cobalt is required during the fixation of nitrogen by rhizobia bacteria in nodules of leguminous plants, In other words, alterations to the chemical composition of the polyhalite in the fertiliser composition according to this aspect of the invention can be tailored to suit particular conditions.
The deficiency in an area of application of the fertiliser composition may be a mineral and/or nutrient imbalance in the area of application.
The area of application may be soil and/or water.
The invention extends to a fertiliser composition comprising at least one polyhalite analogue and a naturally occurring polyhalite. The fertiliser composition may further include other sulphate salts.
The polyhalite analogue may be ASO4 ■ MSO4 ■ 2CaSO4 2H2O where A is selected from K+ and NH4+, and M selected from Mn2+, Fe2+, Co2+, Ni2+, Cu2+ and Zn2+.
The fertiliser composition may consist essentially of a polyhalite analogue and a naturally occurring polyhalite.
The polyhalite analogue may be synthesised.
The fertiliser composition may be in the form of a granule, a pellet, a powder, a suspendable powder, a suspension of solid components in a liquid media or a solution of dissolved salts in water.
The fertiliser composition may comprise: a. 50 to 90 %wt polyhalite; and b. 1 to 50 %wt polyhalite analogue.
The amount of polyhalite analogue included in the fertiliser composition may be predetermined to address a deficiency in an area of application. The deficiency may be a mineral and/or nutrient imbalance in the area of application.
According to a second aspect to the present invention there is provided the use of a fertiliser composition according the first aspect of the invention in soil remediation and/or reclamation and/or recovery of contaminated land. For example, the reduction of magnesium to potassium ratio may be desired in certain scenarios, where the magnesium levels in soils are already at levels in excess of the soil available potassium. Substitution of polyhalite for an analogous triple salt, where M is not Mg, maintains the overall ratio of potassium and calcium sulphates present, whilst introducing other available sources of micronutrients to the soil.
According to a third aspect to the present invention there is provided the use of a fertiliser composition according to the first aspect of the invention as a seed covering, or fertiliser coating, as an animal food additive and/or in hydroponics/aeroponics. According to a fourth aspect to the present invention there is provided the use of a polyhalite analogue as a fertiliser.
According to a fifth aspect to the present invention there is provided a composition including a polyhalite analogue for use in agriculture.
According to a sixth aspect to the present invention there is provided a method of producing a composition comprising at least one polyhalite analogue and a polyhalite, the method comprising adding the polyhalite analogue to the polyhalite.
Detailed Description of the Invention
While the technique for the synthesis of polyhalite analogues is known to the art, a number of the substituted ions are mentioned as being possible to be incorporated into a stable polyhalite analogue compound. Several of these ions are of significant interest when applied as plant micronutrients. Examples include Copper, Manganese, Zinc, Cobalt, and Iron, all of which are all essential micronutrients required for optimum plant growth. The prior art cited does not specify any use cases of said analogues, the art concerned with the study of crystal and structural aspects of the analogues in question. No further examples of the application of said analogues to any previous stated function have been found.
The present invention relates to the application of these analogues as follows:
1 . As a partial additive of the proposed analogues to polyhalite granulation for fertilisers, to potentially increase utility to certain agronomic conditions.
2. To modify the granule elemental content to change the ratio of Mg : K and other nutrients by substituting amounts of natural polyhalite with polyhalite analogues of different compositions. This would, in theory, allow for the incorporation of further micronutrients into a ‘polyhalite granule’, in a modifiable manner to a situation or scenario determined by other field conditions, such as but not limited to, the results of elemental soil analyses in a particular growing season, to visible or anticipated regional or species specific crop deficiencies, or to plant tissue analyses that may determine a requirement for a particular addition. The present invention teaches a means of delivering other elements in a fertiliser by the incorporation of these polyhalite analogues at different ratios into a granule containing predominantly polyhalite, as a means of delivery of other nutrients that is not immediately obvious to those skilled in the art and would not be delivered by the addition of a polyhalite containing composition alone.
Further the invention seeks to provide an alternative delivery means of key crop nutrients via polyhalite analogue compounds incorporated into polyhalite based granules and so to provide a more optimised ratio of elements that is achievable than by polyhalite by itself.
The present invention teaches a means to deliver a polyhalite containing seed coating that can also incorporate micronutrient contents into the composition, whilst maintaining the overall balance of primary and secondary nutrients (Potassium, Sulphur and Calcium) found in a polyhalite composition.
The invention proposes to apply these compounds into an agricultural setting by applying as either an additive format into a polyhalite based granule to thereby offer a significant opportunity to optimise granule content and to include further micronutrients into a granular (or other form of product) containing polyhalite. It is noted that the prior art has existed for over 15 years without the application of the teaching above.
The present invention envisages a fertiliser composition which is dictated by the soil type/ composition and/or the plant to be grown.
An important aspect to the present invention is that the soil requirements and/or any nutrient depletion of the soil is determined before the fertiliser remediation is selected, prepared and/or applied. Effectively the fertiliser can act as a soil modifier or soil enhancer predetermined by the depletion.
Likewise, for seed/plant directed fertilisers, a key prerequisite will be determining the germination/grown lifecycle of the plant. It will be appreciated that different seeds/plants require different minerals at different times during the growth lifecycle. The use of the present fertiliser including the analogue can be used to regulate the needs of the seed/plant to meet growth needs. The fertiliser could be added to the soil directly, provided blended with the seeds or provided as a seed coating and therefore wrapping the seed.
It will be appreciated that the present invention has application in aquaponics and/or hydroponics. Aquaponics is considered to be a cooperation between plants and fish and the term originates from the two words aquaculture (the growing of fish in a closed environment) and hydroponics (the growing of plants usually in a soil-less environment). In particular, hydroponics can be considered the technique of growing plants using a water-based nutrient solution rather than soil. The present invention could therefore be included in the water-based solution of a hydroponic or aquaponic system.
The invention can also be used to improve the use and value of lower grade polyhalite. The lower grade material may be improved by changing it to a high value analogue for use alone or with polyhalite as a fertilizer.
Examples
Example 1
A powder polyhalite product comprising the following;
37% wt. Polyhalite,
23% wt. K2MnCa2(SO4)42H2O
20% wt. K2CuCa2(SO4)42H2O
20% wt. K2ZnCa2(SO4)42H2O
Total 100%
Elemental Composition (%wt.)
At an application rate of 1.5 kg of powder dissolved in 200 Litres of water, applied via foliar application, the example would therefore provide;
Example 2
A granular polyhalite product comprising the following;
83.5% wt. Polyhalite
3.0% wt. K2FeCa2(SO4)4.2H2O
8.0% wt. K2MnCa2(SO4)42H2O
1.0% wt. K2CuCa2(SO4)42H2O
3.5% wt. K2ZnCa2(SO4)42H2O
1.0% wt. organic binder
Total 100%
Elemental composition
Example 2, applied in broadacre crops such as wheat of at a representative rate of 175 kg/ ha at sowing, would therefore apply the following amounts of each;
Recommendation for nutrient addition in UK Winter Wheat (AHDB, 2017)
It can be seen from the comparison that the above example offers the balance of secondary and micronutrients that are recommended to balance offtakes in an average wheat crop in the UK at the point of sowing. Example 3
A granular polyhalite product comprising the following;
82.1% wt. Polyhalite
10% wt. K2FeCa2(SO4)4.2H2O
0.1% wt. K2CoCa2(SO4)4.2H2O
4.0% wt. K2MnCa2(SO4)42H2O
1.0% wt. K2CuCa2(SO4)42H2O
1.8% wt. K2ZnCa2(SO4)42H2O
1.0% wt. organic binder
Total 100%
Elemental Composition
Example 3, applied into grassland at a representative rate of 250 kg/ha, would therefore supply the following amounts;
Recommendations for nutrient addition in UK grassland (AHDB, 2017)
It is known that in grassland (particular that grazed by livestock) deficiencies in Cobalt, Copper and Zinc can be caused by unbalanced nutrition and the impact of increased pH by liming. Likewise, the condition hypomagnesaemia can be caused in livestock by incorrect ratios of K:Mg. Example 3 teaches a composition that can be altered to conditions and provides a changed K:Mg ratio to that of an equivalent granular composition consisting of polyhalite only.

Claims

1 . A solid fertiliser composition comprising at least one polyhalite analogue.
2. A fertiliser composition as claimed in claim 1 further including polyhalite and/or other sulphate salts.
3. A fertiliser composition as claimed in claim 1 wherein the polyhalite analogue is ASO4 ■ MSO4 ■ 2CaSC>4 2H2O where A is selected from K+ and NF , and M selected from Mn2+, Fe2+, Co2+, Ni2+, Cu2+ and Zn2+.
4. A fertiliser composition as claimed in claim 2 or 3 wherein the polyhalite is naturally occurring.
5. A fertiliser composition as claimed in any one of claims 1 to 4 wherein the polyhalite analogue is synthesised.
6. A fertiliser composition as claimed in any one of claims 1 to 5 wherein the composition is in the form of a granule, a pellet, a powder, a suspendable powder, or a suspension of solid components in a liquid media.
7. A fertiliser composition as claimed in any one of claims 1 to 6 comprising: a. 50 to 90 %wt polyhalite; and b. 1 to 50 %wt polyhalite analogue.
8. A fertiliser composition as claimed in any one of claims 1 to 7 wherein the amount of polyhalite analogue is predetermined to address a deficiency in an area of application.
9. A fertiliser composition as claimed in claim 8 wherein the deficiency is a mineral and/or nutrient imbalance in the area of application.
10. A fertiliser composition as claimed in claim 9 wherein the area of application is soil.
11. A fertiliser composition comprising at least one polyhalite analogue and a naturally occurring polyhalite.
12. A fertiliser composition as claimed in claim 12 further including other sulphate salts.
13. A fertiliser composition as claimed in claim 12 wherein the polyhalite analogue is ASO4 ■ MSO4 ■ 2CaSC>4 2H2O where A is selected from K+ and NF , and M selected from Mn2+, Fe2+, Co2+, Ni2+, Cu2+ and Zn2+.
14. A fertiliser composition as claimed in any one of claims 11 to 13 consisting essentially of a polyhalite analogue and a naturally occurring polyhalite.
15. A fertiliser composition as claimed in any one of claims 11 to 14 wherein the polyhalite analogue is synthesised.
16. A fertiliser composition as claimed in any one of claims 11 to 15 wherein the composition is in the form of a granule, a pellet, a powder, a suspendable powder, a suspension of solid components in a liquid media or a solution of dissolved salts in water.
17. A fertiliser composition as claimed in any one of claims 11 to 16 comprising: a. 50 to 90 %wt polyhalite; and b. 1 to 50%wt polyhalite analogue.
18. A fertiliser composition as claimed in any one of claims 11 to 17 wherein the amount of polyhalite analogue is predetermined to address a deficiency in an area of application.
19. A fertiliser composition as claimed in claim 18 wherein the deficiency is a mineral and/or nutrient imbalance in the area of application.
20. Use of a fertiliser composition according to any one of claims 1 to 19 in soil remediation and/or reclamation and/or recovery of contaminated land.
21. Use of a fertiliser composition according to any one of claims 1 to 19 as a seed covering, a fertiliser coating, as an animal food additive and/or in hydroponics/aeroponics.
22. Use of a polyhalite analogue as a fertiliser.
23. A composition including a polyhalite analogue for use in agriculture.
24. A method of producing a composition comprising at least one polyhalite analogue and a polyhalite, the method comprising adding the polyhalite analogue to the polyhalite.
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CN103265348A (en) * 2013-05-30 2013-08-28 天津职业技术师范大学 Caraway water-culture nutrient solution
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