WO2016115613A1 - Fertilizer based on micronized urea and method for producing the fertilizer - Google Patents

Abstract

The present application defines a method for producing urea-based nitrogenated fertilizer, comprising the preliminary micronization of urea (to particles of less than 10 μn), and subsequent addition of an urease inhibitor (H₃BO₃, CuSO₄ or N-(n-butyl)thiophosphoric triamide (NBPT)) and/or a clay mineral (zeolite), followed by granulation. The application also relates to the thus obtained fertilizer in the form of a granulate, pellets or tablets.

Description

 MICRONIZED UREA FERTILIZER AND ITS OBTAINING PROCESS

FIELD OF INVENTION

 [1] The present invention relates to fertilizers used in agricultural crops, describing the synthesis and preparation of fertilizer compositions characterized by slow release of nitrogen. The compositions are prepared based on micronized urea, containing urease and / or clay mineral inhibitors incorporated into the nitrogen fertilizer.

BACKGROUND OF THE INVENTION

 [2] The use of fertilizers as nutrient suppliers is essential to maximize the productive potential of agricultural crops, but these inputs increase production costs, which justifies the search for more efficient fertilizers. It is known that for greater fertilizer efficiency not only the doses that influence, but also the specific characteristics of the fertilizers, application methods and management practices performed.

 [3] Nitrogen (N) is a primary macronutrient and plants generally need it in greater quantities. The forms in which N is present in nitrogen fertilizers can be: nitric (as in calcium nitrate), ammonia (as in ammonium sulfate), or both (as in ammonium nitrate), organic (in waste animals and vegetables, organic compounds), and amidic (urea).

[4] Urea as a nitrogen fertilizer has received much attention from agricultural research, as it represents about 60% of the nitrogen fertilizers used in Brazil. The main advantages of using urea are its high N concentration (44 to 46%), lower costs per N unit, high solubility, low corrosivity and ease of mixing with other sources. The main disadvantage of urea is the loss of N from ammonia volatilization compared to other nitrogen fertilizers, especially when the fertilizer is applied to the soil surface and also by ammonium and nitrate leaching. [5] Urea (CO (NH2) 2) when applied to soil undergoes enzymatic hydrolysis through the urease enzyme, releasing ammonium N (ammonium carbonate - (NH4) 2C03). Due to the subsequent transformations that occur, it can lead to high losses by N volatilization and leaching. Ammonium carbonate formed is unstable and decomposes rapidly, resulting in ammonium, bicarbonate and hydroxyl. The hydroxyl and bicarbonate molecule react with hydrogen atoms, raising the pH of the soil around the fertilizer granules. Thus, part of the ammonium becomes ammonia, which is easily lost to the atmosphere.

[6] Another transformation of N-ammonia (N-NH4 +) from urea transformations in the soil is the nitrification process, which from an agronomic point of view is unfavorable because Brazilian soils have a predominance of negative electric charges in the values of pH used for agricultural production.

[7] Nitrification is the transformation of ammonium N (N-NH4 +) to nitrite (NO2-) and nitrate (N-NO3-). This transformation is carried out in two steps, respectively by bacteria of the genus Nitrosomonas and Nitrobacter. Thus, it can be said that because nitrate has a negative charge, it does not bind to the solid phase in strong bonds, remaining in the soil solution and can be leached. NO3- can be transformed into gaseous forms of N by some microorganisms that have an enzymatic system that makes it possible to use NO3- as an electron receptor (denitrification process), releasing gases into the atmosphere.

[8] Based on the knowledge of the dynamics of N from the application of urea to the soil, as it is the most widely used fertilizer in Brazilian agriculture as a source of N, ways should be sought within a strategic and economic context to minimize the losses of this nutrient. For there are two aspects of relevance in this, the increase of the national production of this input in the coming years and the search for technologies that allow the increase of the agronomic efficiency of the applied nutrients, as the good practices of fertilizer use and the "aggregation of technologies" that control the release of nutrients into the soil, so that nitrogen fertilizers do not become a risk factor for Brazilian agriculture.

 [9] Urease is a naturally occurring enzyme in soils, derived from the synthesis carried out by microorganisms and also from plant residues and is responsible for the enzymatic hydrolysis of urea, releasing ammoniacal N into the medium. Inhibition of the urease enzyme to assist in reducing the rate of urea hydrolysis may occur by heavy metal ions, but these ions inhibit both plant development and urease enzyme activity. The order of effectiveness of these ions in inhibiting the enzyme is known in the following sequence: Hg + 2 ~ Ag +> Cu + 2 »Ni + 2> Cd + 2> Zn + 2> Co + 2> Fe + 3> Pb + 2> Mn + 2 (ZABORSKA, W. et al. J. Enzyme Inhib. Med. Chem., V. 19, p. 65-69, 2004.).

 [10] The state of the art has shown that the most effective inhibiting products are urea analogs such as phosphorodiamidate family PPD (phenyl phosphorodiamidate) and triamidathophosphoric family NBPT (N- (n-butyl) triamidate) of phosphorotriaidates (MARTENS, DA & BREMNER, JM Soil Sci. Soc. Am. J., v. 48, p. 302-305, 1984.).

[1 1] Thus, many additives have been studied to inhibit urease to reduce the rate of urea hydrolysis, gradually releasing N in the soil. Thus, increased efficiency of use by plants due to the reduction of losses of this nutrient mainly by ammonia volatilization and also by ammonium and nitrate leaching by decreasing the concentration of these ions in the soil solution after urea application.

[12] The mechanism for controlling the release of N through polymeric coating and elemental sulfur in urea is by protecting against the ingress of water that the polymer provides to the granules and together with the microbiological degradation of elemental sulfur that reduces soil pH thus decreases the possibility of formation of NH3. The acidification reaction occurs through the oxidation of elemental sulfur (S0), carried out by soil specific microorganisms. [13] The use of urease inhibitors such as triamidathiophosphoric N- (n-butyl) (NBPT), micronutrients such as copper, boric acid, which interfere with urea hydrolysis, polymers that interfere with the solubilization of urea and elemental sulfur. being reported in the prior art as urea additives to control and reduce N losses through volatilization.

 [14] It is known that the mechanism of action of boric acid (H3B03) to retard urea hydrolysis is through competitive inhibition of the active urease site due to its symmetrical positioning between nickel (Ni + 2) ions present. in urease, leaving the hydroxide bridge in place and not changing the distance between nickel atoms (BENINI, S. et al. J. Am. Chem. Soc., v. 126, no. 12, p. 3714-3715, 2004.).

 [15] The mechanism of inhibition of Cu + 2 ion is through non-competitive inhibition of the active urease site, its action in the inhibitory process is based on the interaction of this metal ion with thiol or methylthiol of exposed proteins and amino acids at the active site of urease. enzyme (LI, YG et al. Inorganic Chimica Acta, New York, v. 360, no. 9, p. 2881-2889, 2007). Grohs et al. (GROSH, M. et al. Science and Agrotechnology, Lavras, v. 35, no. 2, pp. 336-345, 2011) also revealed that the use of 0.4% boron coated urea and 0.15 Copper% retards and reduces N losses from ammonia volatilization compared to conventional urea.

[16] Regarding inhibition of urease by formulating micronutrient nitrogenous compost, there are commercial fertilizers formulated with copper and boron. An example of commercial fertilizer is FH Nitro Mais. Patent application PI0700921 -6 applied for by Fertilizantes Heringer SA concerns a fertilizer having in its composition urea, copper sulphate and boric acid in which the pelleted product has an advantage over commercial urea by reducing volatilized nitrogen, acting as an inhibitor of urea ammonia (NH3) losses. Heringer Nitro Mais Commercial Fertilizer, launched in 2007, contains boron and copper and uses urea granule coating technology. [17] Triamidathiophosphoric N- (n-butyl) (NBPT) is one of the main products employed to inhibit the action of urease. However, to inhibit the urease enzyme, it must be converted to the N-n-butyl triamide phosphate compound (NBPTO), its oxygen analogue. This conversion is quick in well-ventilated soils, but may take several days in flooded soil conditions. Thus, this compound is a competitive inhibitor that resembles the urea molecule and binds to the active site of the urease enzyme.

[18] NBPT has been described in US4530714 as a waxy solid compound with poor water solubility, which makes it difficult for the compound to adhere to urea, also because the compound is hydrolyzed and thermally unstable. US5698003 describes the dissolution of NBPT in glycol, preferably a glycerol, which may contain an amide such as N-methyl-2-pyrrolidone and a surfactant or dispersant; US5352265 and US5364438 teach liquid amine dissolution for both solid and liquid formulations.

 [19] US2004 / 0163434 teaches the formation of sulfur-coated urea, which may contain the NBPT urease inhibitor supplied from a liquid formulation sold as Agrotain®, distributed by Koch Agronomic Services, Kansas, USA. Sutton et al. (US50247689) teach the formation of a liquid fertilizer including such as NBPT urease inhibitors and nitrification inhibitors such as dicyandiamide in aqueous mixtures of ammonium and urea polyphosphate, ammonium thiosulfate and other compounds.

 [20] US 2007/0295047 teaches the formation of a solid urea fertilizer and a urea formaldehyde polymer, which may additionally include a urease inhibitor such as NBPT.

 [21] US2007 / 0157689 describes a fertilizer composed of urea, a urea formaldehyde polymer and NBPT dissolved in an N-alkyl-2-pyrrolidone. WO2014022174 teaches the addition of NBPT to urea. Patent documents CN102757285, CN102260123 and

AU2012250293 claim the use of urease inhibitors (e.g. NBPT) in the urea coating. [22] Volatilization N losses can also be reduced by using aluminosilicates as a fertilizer additive, controlling NH4 + retention and release.

 [23] In the scientific literature there are documents on the use of zeolites in agriculture, in particular their use associated with nitrogen fertilizers, as zeolite reduces nitrogen losses through volatilization and provides for the gradual release of fertilizer into the soil. Patent documents CN102757285, CN102260123 and AU2012250293 also report the use of NBPT along with zeolite in urea coating.

[24] EP1379558 reports a zeolite urea coating technology but does not cite any type of zeolite incorporation technology with micronized urea. The granulation process of urea with natural coated zeolites has also been found in the state of the art (LUZ, AB Zeolitas: industrial properties and uses. CETEM / CNPq, 1995. 35p. (Mineral Technology Series, 68) and KISS, S .; SIMIHAIAN, M. Inorganic compounds tested for evaluation of their inhibiting effect on soil urease activity, urea hydrolysis, ammonia volatilization, and nitrous oxide emission In: Improving efficiency of a fertilizer by inhibition of soil urease activity Amsterdam: Kluwer Acaemic, 2002 Chap. 1, pp. 5-42.), But these technologies do not resemble the technology presented in this patent application, nor do they exhibit the same efficiency.

[25] The present invention relates to fertilized compositions based on additive micronized urea of ureaase and / or clay mineral inhibitor compounds, with micronutrients incorporated within the granule.

[26] State of the art compositions do not report the use of micronized urea. In addition, the present invention achieved higher nitrogen release results than fertilizers obtained by traditional techniques, which demonstrates synergy resulting from the use of the compounds associated with the fertilizer composition production technique and the use of micronized urea. Thus, it is noticeable that the present invention differs from the state of the art by the qualitative formulation process and the greater efficacy presented by the final product obtained. SUMMARY OF THE INVENTION

 [27] The present invention relates to fertilizer compositions made from micronized urea produced with additive incorporation technology. Micronized urea of particles smaller than 10 microns should be mixed with urease activity inhibiting additives, which may be triamidathiophosphoric N- (n-butyl) (NBPT) and / or micronutrients such as copper and / or boron and / or clay mineral of the group of zeolites. NBPT is added during the pelletizing process through an aqueous solution or suspension containing at least 0.0062% NBPT which is sprayed onto the micronized urea. Micronutrients should be added as a powder with particles smaller than 0.015 mm in diameter as boric acid (H3BO3) and copper sulphate (CuSO4), with concentrations of 0.6-1.5% of copper sulfate and 1.5-2.4% boric acid. The clay mineral of the zeolite group can be used to achieve the lowest volatilization of nitrogen if added to the formulation containing micronized urea and NBPT at a concentration of 20% zeolite.

BRIEF DESCRIPTION OF THE FIGURES

 [28] Figure 1 - Daily volatilization of ammonia from soil-incorporated nitrogen fertilizers. The legend of the tested fertilizers is described in Table 5.

 [29] Figure 2 - Total volatilized N-NH3 accumulated over the assessed period. The legend of the tested fertilizers is described in Table 5. DETAILED DESCRIPTION OF THE INVENTION

 [30] The present invention relates to chemical compositions for the production of stabilized nitrogen fertilizers characterized by their controlled nitrogen release dynamics when applied to the soil.

[31] Fertilizer formulations are produced from urea granules. The urea is micronized, ie the urea granules are reduced to particles smaller than 10 microns before fertilizer formulations are prepared. [32] All additives are added to the mixture with the ratio defined in relation to the total urea mass contained in the formulation. Fertilizer formulation compositions are produced with the theoretical percentages of each additive. All additives are incorporated within the fertilizer granule. Micronized urea is the differential that allows the incorporation of the additives used within the fertilizer granule. The compositions are described below and in Table 1.

[33] The U_NBPT-i ^* formulation is produced with the N- (n-butyl) triamidathiophosphoric urease inhibitor (NBPT) and is embodied in the mixture of micronized urea and NBPT aqueous solution or suspension using a spray near the micronized urea.

 [34] NBPT can be obtained and applied from the Agrotain® commercial product, in which case it is used in a proportion corresponding to 2,5 L of product per tonne of urea. NBPT can also be added to liquid urea for later pelleting or pelleting.

 Table 1 Examples of formulations made with micronized urea and additive incorporation technology.

 Nutrient Fertilizers and / or Additives

 Micronized Urea: 100%

 U NBPT-i *

 NBPT: 0.062%

 Micronized Urea: 97.21% U_BCu-I * B: 0.4%

 Cu: 0, 15%

 Micronized Urea: 80%

 U NBPT Z-i * Zeolite: 20%

 NBPT: 0.062%

[35] The formulation U_BCu-i ^* is produced with micronized urea (97.21%) with the additives boron (B) and copper (Cu) added as boric acid (H3B03) and copper sulfate (CuSO4). Boron and copper micronutrients are used as a powder with a diameter of less than 0.015mm in the micronized urea mass, with concentrations of 0.6-1.5% copper sulfate and 1.5-2.4%. of boric acid. Boron and copper are incorporated into the micronized urea for further granulation or added to the liquid urea for later pelleting or pelleting. [36] Incorporating the additives in the U_BCu-i ^* formulation into micronized urea granules provides the most efficient results in controlling N losses by a homogeneous physical contact factor between inhibitor and granule urea molecules, while in commercial technology. urea lining with urease inhibitors, only the outer surface of the granules is in contact with the inhibitor. Thus, under humid conditions of the medium in which the granules are present, the surface coating disintegrates and thus the granules are unprotected, thus the urea molecules may undergo the action of the urease enzyme more rapidly.

[37] The formulation U_NBPT_Z-i ^* is produced from the mixture of micronized urea, clay mineral from the zeolite group according to Example 2 and NBPT.

 [38] Thus formulations can be obtained so that they comprise micronized urea and any combinations of urease activity inhibiting additives such as NBPT, copper, boron, sulfur, and clay minerals such as zeolite.

 [39] Urea formulations with additives incorporated into their mass may be mixed in a V-type mixer and then granulated. The equipment used for granulation may be a pelletizer or large scale industrial fertilizer production equipment.

[40] The equipment is adjusted with a tilt angle of the plate around 60 ° and its rotation speed operating around 30 rpm. Granulation of the formulations is performed in a continuous process of adding water interspersed with addition of micronized material and powdered material to the granulation plate. The granulated product, when removed from the granulation plate, is immediately passed through a set of 3.35 and 2.00 mm mesh sieves. The granules remaining between these meshes should be relatively uniform and ready for drying. [41] The following examples are described to better understand the invention, but are not limited to the features set forth in the embodied examples.

EXAMPLE 1

[42] To evaluate the efficiency of micronized urea fertilizers in relation to N volatilization, fertilizers were applied to a soil sampled in the 0-20 cm layer of horizon A of a medium-textured Yellow Red Latosol.

 [43] After collection, the soil was air-dried and then deforested, sieved in a 2 mm mesh sieve, homogenized and characterized for chemical and particle size attributes (Table 2). Soil chemical analysis was performed by determining phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg), organic matter (MO); pH; potential acidity (H + Al); sulfur (S), boron (B), copper (Cu), iron (Fe), manganese (Mn), zinc (Zn), and CTCe (effective cation exchange capacity), V% (base saturation) were also determined. in% (aluminum saturation). The soil field capacity was 28%.

Table 2 - Chemical and particle size analysis of the soil.

pH Ca Mg HClC H + Al SB TV m MO CaCl mmol _c dm ³ % g kg ¹

5.2 23 8 0 33 15 33 48 69 0 22

K P S B Cu Fe Mn Zn Clay Silt Sand

mg dm ^'3 g kg ^{' 1}

1.8 23 4 0, 16 1.5 51 11.8 2.9 178.2 17, 1 804.7 pH in CaCl ₂ , with soil: solution ratio of 1: 2.5; organic matter (OM) by the oxidation of carbon with potassium dichromate as determined by colorimetry and conversion (C x 1.72); and Extraction with ion exchange resin (P, Ca, Mg, K); (H + Al) determined by correlation with pH SMP. Hot water extraction (B); DTPA extraction (Cu, Fe, Mn, Zn); extraction in 0.5 mol L ^"1 ammonium acetate in 0.25 mol L ^{" 1} (S) acetic acid.

EXAMPLE 2

[44] The clay mineral (zeolite) used as an additive for micronized urea formulations was characterized according to its particle size characteristics, CTC, density, surface area, volume and diameter. pores. The particle size analysis was performed according to ABNT NBR ISO 4701 Standard, by wet sieving.

 [45] The final mean CTC results for zeolite were: i) overall zeolite sample: 140 cmolc dm-3; ii) fraction - 38 +20: 148 m cmolc dm-3 and iii) fraction -20 μητ 144 cmolc dm-3. The final density of this clay mineral was equivalent to 2.24 g / cm3.

 [46] The surface area, volume and pore diameter of the zeolite fraction - 38 + 20 pm were determined (Table 4). Table 3. Particle size analysis of the clay mineral sample from the zeolite group used in Formulation 3.

Size fraction retained

 μηι%

 +53 0, 1

 -53 +45 0.9

 -45 + 38 2.9

 -38 + 20 43.1

 -20 52.7

Table 4. Surface area, volume and pore diameter of the zeolite sample

Area Diameter Area Volume Diameter Area

 Volume

 mean surface surface of medium microporous surface

 1 micropore mesopor mesopor o

BET Micropore o Mesopore m ² / g cc / à / g µm ² / g cc / à / g µm ² / g

11.407 2.72e ^"U6 4.8848 1.0854e ^ul 0.048 18.871 16.017 EXAMPLE 3

 [47] To test fertilizer efficiency against nitrogen loss by volatilization, various formulations made from micronized urea and commercial products were tested.

[48] The formulations of Table 5 were laboratory produced from micronized urea using the technology of incorporating additives into the granule. The commercial products reported in table 5 have been tested for efficiency comparison of the claimed products. The chemical analyzes of the fertilizers were performed by determining the total contents of N, S, B and Cu in the urea mixtures with the additives, as well as in the other commercial products to be used in the experiments (Table 5).

 [49] The experiment was installed on 50 cm high / 15 cm diameter PVC columns filled with the soil featured in Example 1. Fertilizers were homogeneously applied to the soil surface of the columns at a dose equivalent to 120 kg of N ha-1, and volatilized nitrogen (N-NH3) from the applied fertilizers was collected and analyzed (Figures 1 and 2) for 29 days. .

[50] Fertilizers with the highest nitrogen loss peaks in this early period, in the order of highest loss, were incorporated zeolite urea (U_Z-i ^* ), commercial pearled urea (U), elemental sulfur urea (U_S0-i ^* ) and commercial fertilizer FH Nitro Gold® (coated with elemental S) (Figure 1).

Table 5 - Analytical values of N, Cu, B and S of laboratory produced nitrogen fertilizers (from micronized urea) and tested commercial fertilizers.

 N Cu B S

Treatment Composition

 -%

 U NBPT-i * Urea + NBPT 43.3 - - -

U BCu-i * Urea + Boron + Copper 41.9 0, 13 0.38 -

U NBPTZ-i * Urea + NBPT + Zeolite 35, 1 - - -

U Z-i * Urea + Zeolite 35.2 - - -

U S ° -1 * Urea + Elemental Sulfur 35.5 - - 14.6

U NBPTCu-i * Urea + NBPT + Cu 42.7 0, 13 - -

U Cu-i * Urea + Copper 44.3 0, 14 - -

U BCuZ-i * Urea + Boron + Copper + Zeolite 37.2 0.10 0.27

 U_S ° Z-i * Urea + Sulfur 30.7 - - 10.2 Elemental + Zeolite

 U NBPTCuZ- Urea + NBPT + Copper + Zeolite 34.5 0, 11 - -

; 1*

 U Commercial Pearly Urea 43,9

Super N ^® Urea + NBPT 42.4 - - -

FH Nitro More ^® Urea + B + Cu 43,10,14 0.39 -

FH Nitro Gold ^® Urea + S ° 37.5 - - 15, 1

SA Ammonium sulphate 19.3 - - - * Formulations made with technology for incorporating additives into the granules. ¹ Analyzes were performed according to the "Manual of Official Analytical Methods for Mineral, Organic, Organomineral and Corrective Fertilizers" published by the Ministry of Agriculture, Livestock and Supply in 2007.

[51] The studied fertilizers with the highest accumulated N losses due to volatilization, not statistically different, were commercial pearly urea (U), polymeric coated urea and elemental sulfur - FH Nitro Gold® and zeolite-incorporated urea. formulation (U_Z-i ^* ), with 27, 24 and 25% N-NH 3 losses in relation to the total N applied, respectively (Figure 2). The formulations with the incorporation of urease inhibitors NBPT, B and Cu, (U_NBPT-i ^* U_BCu ^{* *} ), were more efficient in controlling N losses due to volatilization (3.8 and 6.84% N losses). -NH3) when compared to the commercial Super N® and Nitro Mais® fertilizers, which are coated with these same additives (10.9 and 12.6% N-NH3 losses).

EXAMPLE 4

 [52] An experiment conducted to test micronized urea and granulated fertilizers according to example 3 was conducted with potted corn plants grown in a greenhouse.

 [53] The fertilizers tested were: pearly urea; 2) FH Nitro Mais® (urea + Cu 0.15% + B 0.4%); 3) Super N® (urea + 0.062% NBPT); 4) 100% micronized urea + 0.062% NBPT; 5) 97.21% micronized urea + 0.4% B + 0.15% Cu and 6) 80% micronized urea + 20% zeolite + 0.062% NBPT.

[54] Nitrogen fertilizers were applied to the soil surface of the pots filled with 6kg of soil described in Example 1 at a dose equivalent to 120kg ha-1 of N at 12 days after sowing (this time for germination and thinning, keeping only two seedlings per pot). The soil was moistened prior to fertilizer application, being moistened again after the third day of application. Moisture was maintained at 70 to 90% of field capacity throughout the crop cycle, with daily control.

[55] After 28 days of nitrogen fertilizer application, 40 days after sowing, the plant material was harvested, separating part of the aerial, with cut close to the ground, and root system, and then the determination of total N (Table 6).

Table 6. N accumulation in corn plant tissue, as a function of the application of commercial fertilizers and nitrogen formulations in the soil.

 Total accumulated N treatment per plant

Pearly Urea 379.8

 FH Nitro Mais® 388.3

 Super N® 346.9

 Micronized Urea + NBPT 396.9

 Micronized Urea + B + Cu 374.8

 Micronized Urea + NBPT + Zeolite 439.8

[56] Formulations made from micronized urea + NBPT and micronized urea + zeolite + NBPT were more efficient in total accumulated N when compared to pearly urea and commercial urease inhibitor coated fertilizers (FH Nitro Mais® and Super N®). It can also be stated that the formulation of micronized urea + zeolite + NBPT presented the best results, superior to the other formulations and all commercial fertilizers tested for N accumulation in corn plant tissues (Table 6). The results demonstrate the synergistic effect of the micronutrient incorporation production process associated with the use of micronized urea in the fertilizer compositions of the present invention.

Claims

 1 . Process for obtaining nitrogen fertilizer with additive incorporation characterized by the fact that it comprises the steps of: i) reducing the particle size of urea granules to values below 10 microns; and ii) adding to the product obtained in (i) at least one urease inhibiting agent and / or at least one clay mineral.  Process for obtaining nitrogen fertilizer with additive incorporation according to claim 1, characterized in that step (i) uses micronization and / or ultramicronization techniques.  Process for obtaining nitrogen fertilizer with additive incorporation according to claim 1, characterized in that the urease inhibiting agent (s) of step (ii) is selected from from the group consisting of: phosphoramides, boron and copper. Process for obtaining nitrogen fertilizer with additive incorporation according to claim 1, characterized in that the clay mineral of step (ii) is zeolite.  Process for obtaining nitrogen fertilizer with additive incorporation according to claim 3, characterized in that the phosphoramide-type urease inhibiting agent is the N- (n-butyl) triamidathiophosphoric compound (NBPT).  Process for obtaining an additive-incorporating nitrogen fertilizer according to Claim 5, characterized in that the N- (n-butyl) triamidathiophosphoric compound is diluted with N-methyl-2-pyrrolidone or a solvent compatible with N- ( n-butyl) triamidathiophosphoric.  Process for obtaining nitrogen fertilizer with additive incorporation according to claim 1, characterized in that step (ii) consists of spraying under micronized urea obtained from (i) aqueous solution or suspension containing at least 0.0062 % of NBPT. Process for obtaining nitrogen fertilizer with additive incorporation according to claim 1, characterized in that step (ii) consists of spraying under the micronized urea obtained from (i) solution, or aqueous suspension containing at least 0.0062% NBPT and addition of zeolite group clay mineral.  A process for obtaining nitrogen fertilizer with additive incorporation according to claim 1, characterized in that step (ii) comprises the addition of micronutrients with particle size less than 0.015 mm in diameter.  Process for obtaining nitrogen fertilizer with additive incorporation according to claim 1, characterized in that step (ii) consists of the addition of boric acid (H3B03) and copper sulfate (CuS04). 1 1. Process for obtaining nitrogen fertilizer with additive incorporation according to claim 10, characterized in that step (ii) consists of the addition of 1.5 to 2.4% boric acid (H3B03) and copper sulfate (CuS04). ) at a concentration of 0.6 to 1.5%.  12. Nitrogen fertilizer with additive incorporation characterized in that it comprises micronized urea and at least one additive selected from the group consisting of boron, copper, NBPT and argilomineral, and which is obtained according to the procurement process described in any one of claims 1 to 1 1  Nitrogen fertilizer with additive incorporation according to claim 11, characterized in that it is presented in granules, tablets or tablets.