Composite water-soluble fertilizer and preparation method thereof

Abstract

The application relates to the technical field of fertilizers, and discloses a compound water-soluble fertilizer and a preparation method thereof. The compound water-soluble fertilizer is obtained by mixing an anti-caking agent, urea, ammonium dihydrogen phosphate and potassium sulfate; the anti-caking agent is obtained by mixing a chelate powder, potassium polyacrylate and a hydrophobic agent; the hydrophobic agent is prepared from deionized water, sodium dodecyl sulfate, polyoxyethylene sorbitan monooleate, acrylic acid, octadecyl methacrylate and an aqueous ammonium persulfate solution; the chelate powder is obtained by spray drying deionized water, hydrolyzed polypeptide powder, magnesium sulfate heptahydrate and zinc sulfate monohydrate; and the hydrolyzed polypeptide powder is prepared from deionized water, gelatin, an aqueous sulfuric acid solution and an aqueous sodium hydroxide solution. The fertilizer has good anti-caking property.

Description

Technical Field

[0001] This invention relates to the field of fertilizer technology, specifically to a compound water-soluble fertilizer and its preparation method. Background Technology

[0002] Compound water-soluble fertilizer is a modern fertilizer with high nutrient content that can be precisely formulated according to crop needs. It is of great significance for improving water and fertilizer use efficiency and achieving water conservation and increased agricultural production.

[0003] Patent CN105523844A discloses a novel urea compound fertilizer product comprising urea, a cationic polymer copolymer, and a fertilizer colorant. The preparation method for the novel urea compound fertilizer involves uniformly mixing the cationic polymer copolymer, fertilizer colorant, and molten urea, followed by granulation; or uniformly mixing the cationic polymer copolymer, fertilizer colorant, and granulated urea in a mixing apparatus and coating the mixture onto the surface of the urea to prepare the novel urea compound fertilizer. However, the existing technology still has some shortcomings: existing fertilizers are prone to clumping during production, storage, transportation, and use, which restricts their industrial development and market application. Summary of the Invention

[0004] The purpose of this invention is to provide a compound water-soluble fertilizer and its preparation method to solve the problems existing in the prior art.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A compound water-soluble fertilizer is obtained by mixing an anti-caking agent, urea, ammonium dihydrogen phosphate, and potassium sulfate; the anti-caking agent is obtained by mixing a chelate powder, potassium polyacrylate, and a hydrophobic agent; the hydrophobic agent is prepared from deionized water, sodium dodecyl sulfate, polyoxyethylene dehydrated sorbitan monooleate, acrylic acid, octadecyl methacrylate, and an aqueous solution of ammonium persulfate; the chelate powder is obtained by spray drying deionized water, hydrolyzed polypeptide powder, magnesium sulfate heptahydrate, and zinc sulfate monohydrate; the hydrolyzed polypeptide powder is prepared from deionized water, gelatin, an aqueous solution of sulfuric acid, and an aqueous solution of sodium hydroxide.

[0006] Furthermore, the mass fraction of the sulfuric acid aqueous solution is 10-20%.

[0007] Furthermore, the mass fraction of the ammonium persulfate aqueous solution is 5-8%.

[0008] Furthermore, the weight-average molecular weight of potassium polyacrylate is 3000-5000.

[0009] A method for preparing a compound water-soluble fertilizer includes the following steps: (1) Add deionized water and gelatin to the reaction vessel, stir at 120-150 rpm at 50-60℃ for 30-40 minutes, then cool to 25±5℃, slowly add sulfuric acid aqueous solution over 40-60 minutes, after the addition is complete, reflux and stir at 120-150 rpm at 90-100℃ for 5-6 hours, then cool to 25±5℃, adjust the pH value to 5.5-6.0 with sodium hydroxide aqueous solution of 9-11% by mass, then dry at 65-70℃ and vacuum degree -0.095MPa for 4-6 hours, pulverize and pass through a 100-200 mesh sieve to obtain hydrolyzed polypeptide powder; (2) Add deionized water and hydrolyzed peptide powder to the reaction vessel, stir at 80-100 rpm for 30-40 minutes at 45-55℃, then add magnesium sulfate heptahydrate and zinc sulfate monohydrate, continue stirring for 2-3 hours, and then spray dry, controlling the inlet air temperature at 130-150℃ and the outlet air temperature at 85-95℃ to obtain chelate powder; (3) Under nitrogen protection, deionized water, sodium dodecyl sulfate, polyoxyethylene dehydrated sorbitan monooleate, acrylic acid and octadecyl methacrylate are added to the reaction vessel. The mixture is stirred at 300-400 rpm for 10-20 minutes at 25±5℃. The temperature is raised to 70-80℃, and then ammonium persulfate aqueous solution is added dropwise over 90-110 minutes. After the addition is complete, stirring is continued for 2-3 hours. Spray drying is carried out, and the inlet air temperature is controlled at 120-140℃ and the outlet air temperature at 80-90℃ to obtain a hydrophobic agent. (4) Place the chelate powder, potassium polyacrylate and hydrophobic agent in a mixer and mix at 500-800 rpm for 20-30 minutes at 25±5℃ to obtain an anti-caking agent; (5) Mix the anti-caking agent, urea, ammonium dihydrogen phosphate and potassium sulfate, and mix at 25±5℃ and 25-35 rpm for 30-40 minutes to obtain a compound water-soluble fertilizer.

[0010] Furthermore, in step (1), the mass ratio of deionized water, gelatin and sulfuric acid aqueous solution is 100:14.3-16.7:14.3-16.7.

[0011] Furthermore, in step (2), the mass ratio of hydrolyzed polypeptide powder, deionized water, magnesium sulfate heptahydrate and zinc sulfate monohydrate is 100:500-600:15-25:4-8.

[0012] Furthermore, in step (3), the mass ratio of deionized water, sodium dodecyl sulfate, polyoxyethylene dehydrated sorbitan monooleate, acrylic acid, octadecyl methacrylate and ammonium persulfate aqueous solution is 200-300:2-4:2-4:10-15:60-80:5-10.

[0013] Furthermore, in step (4), the mass ratio of chelate powder, potassium polyacrylate and hydrophobic agent is 100:5-10:30-50.

[0014] Furthermore, in step (5), the mass ratio of anti-caking agent, urea, ammonium dihydrogen phosphate and potassium sulfate is 10-15:45-48:12-15:16-18.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are: 1. In this invention, under the catalysis of sulfuric acid, the peptide bonds in gelatin molecules undergo hydrolysis and breakage to generate hydrolyzed polypeptides. The carboxyl and amino groups of these hydrolyzed polypeptides undergo coordination complexation reactions with magnesium and zinc ions provided by magnesium sulfate heptahydrate and zinc sulfate monohydrate to generate chelates. The sulfate radicals generated by the decomposition of ammonium persulfate can initiate a copolymerization reaction between octadecyl methacrylate and acrylic acid to generate hydrophobic polymers. The potassium polyacrylate and polypeptide segments in the anti-caking agent, due to their hydrophilicity and polarity, can be adsorbed onto the surface of easily hygroscopic fertilizer granules such as urea and ammonium dihydrogen phosphate, while the hydrophobic agent in the anti-caking agent forms on the surface of the fertilizer granules. A dense hydrophobic film is formed, effectively blocking direct contact between environmental moisture and the particles, thus delaying moisture absorption. Simultaneously, the potassium polyacrylate and polypeptide chains adsorbed on the particle surface physically isolate the fertilizer particles through the steric hindrance effect of their long-chain structure, achieving a dispersing effect. More importantly, the magnesium and zinc ions chelated by the polypeptides exist in a stable organic state, significantly reducing the concentration of free metal ions and inhibiting the side reactions that cause them to form insoluble complex salts with phosphate and salt bridges between particles. Through the triple synergistic effect of hydrophobic barrier, steric hindrance, and salt bridge inhibition, the clumping rate of the compound water-soluble fertilizer is ultimately reduced from multiple angles. Detailed Implementation

[0016] The following embodiments are provided to better understand the present invention and are not limited to the preferred embodiments described. They do not constitute a limitation on the content and scope of protection of the present invention. Any product that is the same as or similar to the present invention, derived by any person under the guidance of the present invention or by combining the features of the present invention with other prior art, falls within the protection scope of the present invention.

[0017] A compound water-soluble fertilizer is obtained by mixing an anti-caking agent, urea, ammonium dihydrogen phosphate, and potassium sulfate; the anti-caking agent is obtained by mixing a chelate powder, potassium polyacrylate, and a hydrophobic agent; the hydrophobic agent is prepared from deionized water, sodium dodecyl sulfate, polyoxyethylene dehydrated sorbitan monooleate, acrylic acid, octadecyl methacrylate, and an aqueous solution of ammonium persulfate; the chelate powder is obtained by spray drying deionized water, hydrolyzed polypeptide powder, magnesium sulfate heptahydrate, and zinc sulfate monohydrate; the hydrolyzed polypeptide powder is prepared from deionized water, gelatin, an aqueous solution of sulfuric acid, and an aqueous solution of sodium hydroxide.

[0018] For experiments not specifically described in the examples, the procedures or conditions should be followed according to the conventional experimental procedures described in the literature in this field. Reagents or instruments whose manufacturers are not specified are all commercially available conventional reagent products. Example 1

[0019] (1) Add deionized water and gelatin to the reaction vessel, stir at 120 rpm for 30 minutes at 50°C, then cool to 25±5°C, and slowly add 10% sulfuric acid aqueous solution over 40 minutes. After the addition is complete, reflux and stir at 120 rpm for 5 hours at 90°C, then cool to 25±5°C, adjust the pH to 5.5 with 9% sodium hydroxide aqueous solution, and then dry at 65°C and vacuum degree -0.095MPa for 4 hours. After pulverizing, pass through a 100-mesh sieve to obtain hydrolyzed polypeptide powder; wherein the mass ratio of deionized water, gelatin and sulfuric acid aqueous solution is 100:14.3:14.3.

[0020] (2) Add deionized water and hydrolyzed polypeptide powder to the reactor, stir at 80 rpm for 30 minutes at 45°C, then add magnesium sulfate heptahydrate and zinc sulfate monohydrate, continue stirring for 2 hours, and then spray dry, controlling the inlet air temperature to 130°C and the outlet air temperature to 85°C to obtain chelate powder; wherein the mass ratio of hydrolyzed polypeptide powder, deionized water, magnesium sulfate heptahydrate and zinc sulfate monohydrate is 100:500:15:4.

[0021] (3) Under nitrogen protection, deionized water, sodium dodecyl sulfate, polyoxyethylene dehydrated sorbitan monooleate, acrylic acid and octadecyl methacrylate were added to the reactor. The mixture was stirred at 300 rpm for 10 minutes at 25±5℃. The temperature was then raised to 70℃. A 5% ammonium persulfate aqueous solution was added dropwise over 90 minutes. After the addition was complete, the mixture was stirred for 2 hours and then spray-dried. The inlet air temperature was controlled at 120℃ and the outlet air temperature at 80℃ to obtain a hydrophobic agent. The mass ratio of deionized water, sodium dodecyl sulfate, polyoxyethylene dehydrated sorbitan monooleate, acrylic acid, octadecyl methacrylate and ammonium persulfate aqueous solution was 200:2:2:10:60:5.

[0022] (4) Place the chelate powder, potassium polyacrylate with a weight average molecular weight of 3000 and the hydrophobic agent in a mixer and mix at 500 rpm for 20 minutes at 25±5℃ to obtain the anti-caking agent; wherein the mass ratio of the chelate powder, potassium polyacrylate and the hydrophobic agent is 100:5:30.

[0023] (5) Mix the anti-caking agent, urea, ammonium dihydrogen phosphate and potassium sulfate, and mix at 25 rpm for 30 minutes at 25±5℃ to obtain a compound water-soluble fertilizer. The mass ratio of the anti-caking agent, urea, ammonium dihydrogen phosphate and potassium sulfate is 10:45:12:16. Example 2

[0024] (1) Add deionized water and gelatin to the reactor, stir at 135 rpm for 35 minutes at 55°C, then cool to 25±5°C, and slowly add 15% sulfuric acid aqueous solution over 50 minutes. After the addition is complete, reflux and stir at 135 rpm for 5.5 hours at 95°C, then cool to 25±5°C, adjust the pH to 5.8 with 10% sodium hydroxide aqueous solution, and then dry at 67°C and vacuum degree -0.095MPa for 5 hours. After pulverizing, pass through a 150-mesh sieve to obtain hydrolyzed polypeptide powder; wherein the mass ratio of deionized water, gelatin and sulfuric acid aqueous solution is 100:15.5:15.5.

[0025] (2) Add deionized water and hydrolyzed polypeptide powder to the reactor and stir at 90 rpm for 35 minutes at 50°C. Then add magnesium sulfate heptahydrate and zinc sulfate monohydrate and continue stirring for 2.5 hours. Then spray dry the mixture, controlling the inlet air temperature at 140°C and the outlet air temperature at 90°C to obtain chelate powder. The mass ratio of hydrolyzed polypeptide powder, deionized water, magnesium sulfate heptahydrate and zinc sulfate monohydrate is 100:550:20:6.

[0026] (3) Under nitrogen protection, deionized water, sodium dodecyl sulfate, polyoxyethylene dehydrated sorbitan monooleate, acrylic acid and octadecyl methacrylate were added to the reactor. The mixture was stirred at 350 rpm for 15 minutes at 25±5℃, and the temperature was raised to 75℃. Then, a 6.5% ammonium persulfate aqueous solution was added dropwise over 100 minutes. After the addition was completed, the mixture was stirred for 2.5 hours and spray-dried. The inlet air temperature was controlled at 130℃ and the outlet air temperature at 85℃ to obtain a hydrophobic agent. The mass ratio of deionized water, sodium dodecyl sulfate, polyoxyethylene dehydrated sorbitan monooleate, acrylic acid, octadecyl methacrylate and ammonium persulfate aqueous solution was 250:3:3:12.5:70:7.5.

[0027] (4) Place the chelate powder, potassium polyacrylate with a weight average molecular weight of 4000 and the hydrophobic agent in a mixer and mix at 650 rpm for 25 minutes at 25±5℃ to obtain the anti-caking agent; wherein the mass ratio of the chelate powder, potassium polyacrylate and the hydrophobic agent is 100:7:40.

[0028] (5) Mix the anti-caking agent, urea, ammonium dihydrogen phosphate and potassium sulfate, and mix at 30 rpm for 35 minutes at 25±5℃ to obtain a compound water-soluble fertilizer. The mass ratio of the anti-caking agent, urea, ammonium dihydrogen phosphate and potassium sulfate is 12:46.5:13.5:17. Example 3

[0029] (1) Add deionized water and gelatin to the reaction vessel, stir at 150 rpm for 40 minutes at 60°C, then cool to 25±5°C, and slowly add 20% sulfuric acid aqueous solution over 60 minutes. After the addition is complete, reflux and stir at 150 rpm for 6 hours at 100°C, then cool to 25±5°C, adjust the pH to 6.0 with 11% sodium hydroxide aqueous solution, and then dry at 70°C and vacuum degree -0.095MPa for 6 hours. After pulverizing, pass through a 200-mesh sieve to obtain hydrolyzed polypeptide powder; wherein the mass ratio of deionized water, gelatin and sulfuric acid aqueous solution is 100:16.7:16.7.

[0030] (2) Add deionized water and hydrolyzed polypeptide powder to the reactor, stir at 100 rpm for 40 minutes at 55°C, then add magnesium sulfate heptahydrate and zinc sulfate monohydrate, continue stirring for 3 hours, and then spray dry, controlling the inlet air temperature to 150°C and the outlet air temperature to 95°C to obtain chelate powder; wherein the mass ratio of hydrolyzed polypeptide powder, deionized water, magnesium sulfate heptahydrate and zinc sulfate monohydrate is 100:600:25:8.

[0031] (3) Under nitrogen protection, deionized water, sodium dodecyl sulfate, polyoxyethylene dehydrated sorbitan monooleate, acrylic acid and octadecyl methacrylate were added to the reactor. The mixture was stirred at 400 rpm for 20 minutes at 25±5℃. The temperature was raised to 80℃, and then an 8% ammonium persulfate aqueous solution was added dropwise over 110 minutes. After the addition was completed, the mixture was stirred for 3 hours and spray-dried. The inlet air temperature was controlled at 140℃ and the outlet air temperature at 90℃ to obtain a hydrophobic agent. The mass ratio of deionized water, sodium dodecyl sulfate, polyoxyethylene dehydrated sorbitan monooleate, acrylic acid, octadecyl methacrylate and ammonium persulfate aqueous solution was 300:4:4:15:80:10.

[0032] (4) Place the chelate powder, potassium polyacrylate with a weight average molecular weight of 5000 and the hydrophobic agent in a mixer and mix at 800 rpm for 30 minutes at 25±5℃ to obtain an anti-caking agent; wherein the mass ratio of the chelate powder, potassium polyacrylate and the hydrophobic agent is 100:10:50.

[0033] (5) Mix the anti-caking agent, urea, ammonium dihydrogen phosphate and potassium sulfate, and mix at 25±5℃ and 35 rpm for 40 minutes to obtain a compound water-soluble fertilizer. The mass ratio of the anti-caking agent, urea, ammonium dihydrogen phosphate and potassium sulfate is 15:48:15:18.

[0034] Comparative Example 1 The only difference between Comparative Example 1 and Example 1 is that no anti-caking agent is added.

[0035] Comparative Example 2 The only difference between Comparative Example 2 and Example 1 is that potassium polyacrylate is not added.

[0036] Comparative Example 3 The only difference between Comparative Example 3 and Example 1 is that no hydrophobic agent is added.

[0037] Agglomeration rate: Weigh 500 grams of each sample and place them in a breathable bag. Store for 30 days at 40℃ and 75% relative humidity. After storage, drop the sample naturally from a height of 1 meter, once on each side. Then, sieve the fertilizer through a 5mm standard sieve and weigh the mass of agglomerates that failed to pass through the sieve. Agglomeration rate (%) = (mass of agglomerates / total sample mass) × 100%. Repeat the test 3 times and take the average value.

[0038] Table 1 below shows the performance analysis results of the embodiments and comparative examples of the present invention.

[0039] Table 1

[0040] Experimental data from the examples and comparative examples show that this invention uses hydrolyzed peptides as organic chelating agents, potassium polyacrylate as a polymeric dispersant, octadecyl methacrylate as a hydrophobic monomer, and ammonium persulfate as an initiator. The hydrolyzed peptides form chelates by coordinating and complexing with magnesium and zinc ions through the abundant carboxyl and amino groups on their molecular chains. The sulfate radicals generated from the decomposition of ammonium persulfate can initiate a copolymerization reaction between octadecyl methacrylate and acrylic acid, generating a hydrophobic polymer. The potassium polyacrylate and peptide segments in the anti-caking agent, due to their hydrophilicity and polarity, can adsorb onto the surface of easily hygroscopic fertilizer granules such as urea and ammonium dihydrogen phosphate, thus preventing caking. The hydrophobic agent in the block fertilizer forms a dense hydrophobic film on the surface of the fertilizer granules, effectively preventing moisture in the environment from directly contacting the granules and delaying moisture absorption. At the same time, the potassium polyacrylate and polypeptide chains adsorbed on the granule surface physically isolate the fertilizer granules through the steric hindrance effect of their long-chain structure, thus playing a dispersing role. More importantly, the magnesium and zinc ions chelated by the polypeptides exist in a stable organic state, which greatly reduces the concentration of free metal ions, thereby inhibiting the side reaction of forming insoluble complex salts with phosphate and salt bridges between granules. Through the triple synergistic effect of hydrophobic barrier, steric hindrance, and salt bridge inhibition, the clumping rate of compound water-soluble fertilizer is ultimately reduced from multiple angles.

[0041] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No markings in the claims should be construed as limiting the scope of the claims.

Claims

1. A compound water-soluble fertilizer, characterized in that, The compound water-soluble fertilizer is obtained by mixing an anti-caking agent, urea, ammonium dihydrogen phosphate, and potassium sulfate; the anti-caking agent is obtained by mixing a chelate powder, potassium polyacrylate, and a hydrophobic agent; the hydrophobic agent is prepared from deionized water, sodium dodecyl sulfate, polyoxyethylene dehydrated sorbitan monooleate, acrylic acid, octadecyl methacrylate, and an aqueous solution of ammonium persulfate; the chelate powder is obtained by spray drying deionized water, hydrolyzed polypeptide powder, magnesium sulfate heptahydrate, and zinc sulfate monohydrate; the hydrolyzed polypeptide powder is prepared from deionized water, gelatin, an aqueous solution of sulfuric acid, and an aqueous solution of sodium hydroxide.

2. The compound water-soluble fertilizer according to claim 1, characterized in that: The mass fraction of sulfuric acid aqueous solution is 10-20%.

3. The compound water-soluble fertilizer according to claim 1, characterized in that: The mass fraction of ammonium persulfate aqueous solution is 5-8%.

4. The compound water-soluble fertilizer according to claim 1, characterized in that: The weight-average molecular weight of potassium polyacrylate is 3000-5000.

5. A method for preparing a compound water-soluble fertilizer, applied to the compound water-soluble fertilizer according to any one of claims 1-4, characterized in that, Includes the following steps: (1) Add deionized water and gelatin to the reaction vessel, stir at 120-150 rpm at 50-60℃ for 30-40 minutes, then cool to 25±5℃, slowly add sulfuric acid aqueous solution over 40-60 minutes, after the addition is complete, reflux and stir at 120-150 rpm at 90-100℃ for 5-6 hours, then cool to 25±5℃, adjust the pH value to 5.5-6.0 with sodium hydroxide aqueous solution of 9-11% by mass, then dry at 65-70℃ and vacuum degree -0.095MPa for 4-6 hours, pulverize and pass through a 100-200 mesh sieve to obtain hydrolyzed polypeptide powder; (2) Add deionized water and hydrolyzed peptide powder to the reaction vessel, stir at 80-100 rpm for 30-40 minutes at 45-55℃, then add magnesium sulfate heptahydrate and zinc sulfate monohydrate, continue stirring for 2-3 hours, and then spray dry, controlling the inlet air temperature at 130-150℃ and the outlet air temperature at 85-95℃ to obtain chelate powder; (3) Under nitrogen protection, deionized water, sodium dodecyl sulfate, polyoxyethylene dehydrated sorbitan monooleate, acrylic acid and octadecyl methacrylate are added to the reaction vessel. The mixture is stirred at 300-400 rpm for 10-20 minutes at 25±5℃. The temperature is raised to 70-80℃, and then ammonium persulfate aqueous solution is added dropwise over 90-110 minutes. After the addition is complete, stirring is continued for 2-3 hours. Spray drying is carried out, and the inlet air temperature is controlled at 120-140℃ and the outlet air temperature at 80-90℃ to obtain a hydrophobic agent. (4) Place the chelate powder, potassium polyacrylate and hydrophobic agent in a mixer and mix at 500-800 rpm for 20-30 minutes at 25±5℃ to obtain an anti-caking agent; (5) Mix the anti-caking agent, urea, ammonium dihydrogen phosphate and potassium sulfate, and mix at 25±5℃ and 25-35 rpm for 30-40 minutes to obtain a compound water-soluble fertilizer.

6. The preparation method of the compound water-soluble fertilizer according to claim 5, characterized in that: In step (1), the mass ratio of deionized water, gelatin and sulfuric acid aqueous solution is 100:14.3-16.7:14.3-16.

7.

7. The preparation method of the compound water-soluble fertilizer according to claim 5, characterized in that: In step (2), the mass ratio of hydrolyzed polypeptide powder, deionized water, magnesium sulfate heptahydrate and zinc sulfate monohydrate is 100:500-600:15-25:4-8.

8. The preparation method of the compound water-soluble fertilizer according to claim 5, characterized in that: In step (3), the mass ratio of deionized water, sodium dodecyl sulfate, polyoxyethylene sorbitan monooleate, acrylic acid, octadecyl methacrylate and ammonium persulfate aqueous solution is 200-300:2-4:2-4:10-15:60-80:5-10.

9. The preparation method of the compound water-soluble fertilizer according to claim 5, characterized in that: In step (4), the mass ratio of chelate powder, potassium polyacrylate and hydrophobic agent is 100:5-10:30-50.

10. The preparation method of the compound water-soluble fertilizer according to claim 5, characterized in that: In step (5), the mass ratio of anti-caking agent, urea, ammonium dihydrogen phosphate and potassium sulfate is 10-15:45-48:12-15:16-18.

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