Special surfactant for balanced fertilizer and preparation method thereof

Abstract

The invention discloses a special surfactant for a balanced fertilizer and a preparation method of the special surfactant, and relates to the technical field of fertilizers. Comprising the following raw materials in parts by weight: urea ammonium nitrate, potassium carbonate, trace elements, a synergist, a surfactant, an organic silicon additive, deionized water, a chelating agent, a thickening agent and a fertilizer component, according to the fertilizer disclosed by the invention, the chelating agent is matched for use, and the chelating agent has a good dispersion characteristic and a chelating function, so that crops are promoted to absorb nutrients, and the absorption and utilization rate of the balanced fertilizer is further improved; by adding the surfactant and the organic silicon additive, the soil structure can be improved and the moisture can be maintained, so that the balanced fertilizer is stable in dispersion system and good in product activity in the use process, the fertilizer loss is reduced, the fertilizer application amount is reduced, the crop yield and quality are improved, and the fruit setting rate is increased; and the balance fertilizer composition prepared from the surfactant can improve the utilization rate of the balance fertilizer.

Description

Technical Field

[0001] This invention relates to the field of fertilizer technology, specifically to a surfactant for balanced fertilizer and its preparation method. Background Technology

[0002] Balanced fertilizer, also known as compound fertilizer, is a fertilization technique based on crop nutrient requirements, soil nutrient supply characteristics, and fertilizer effects. It involves rationally determining the appropriate amounts and proportions of nitrogen, phosphorus, potassium, and micronutrients, building upon the application of organic fertilizer, and employing corresponding scientific application methods. Balanced fertilization maximizes fertilizer utilization and reduces waste by applying fertilizers according to soil conditions and crop nutrient requirements. This saves on fertilization costs and reduces soil compaction caused by excessive use of chemical fertilizers. Balanced fertilizer offers significant advantages in improving fertilizer utilization, conserving agricultural water, reducing environmental pollution, improving crop quality, and reducing labor costs.

[0003] In recent years, insufficient micronutrient supply in the soil has limited crop yields, made pests and diseases difficult to control, and reduced the quality of agricultural products. Existing balanced fertilizers typically involve directly mixing various water-soluble fertilizer raw materials, resulting in generally low fertilizer absorption and utilization rates, which in turn affect crop absorption and utilization. Improving the utilization rate of balanced fertilizers is therefore urgent. However, the activity of surfactants added to fertilizer formulations during production and mixing is not considered, leading to reduced fertilizer efficacy. To address these issues, we propose a special surfactant for balanced fertilizers and its preparation method. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a surfactant specifically for balanced fertilizers and its preparation method, thereby resolving the problems mentioned in the background section.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a surfactant for balanced fertilizer, comprising the following raw materials in parts by weight: 16-18 parts of urea ammonium nitrate, 1-6 parts of potassium carbonate, 4-8 parts of trace elements, 2-5 parts of synergist, 8-10 parts of surfactant, 1-5 parts of organosilicon additive, 30-40 parts of deionized water, 5-10 parts of chelating agent, 3-5 parts of thickener, and 30-50 parts of fertilizer components.

[0006] To further optimize this technical solution, the fertilizer components include the following parts by weight: 4-8 parts magnesium sulfate heptahydrate, 2-8 parts zinc sulfate, 2-5 parts manganese sulfate, 1-3 parts copper sulfate, 2-6 parts ammonium molybdate, and 1-3 parts sodium borate decahydrate.

[0007] A method for preparing a surfactant specifically for balanced fertilizers includes the following steps:

[0008] S1. Mixing and stirring process

[0009] Urea ammonium nitrate, potassium carbonate and trace elements are put into a mixer and stirred to prepare the required mixture one, which is then set aside.

[0010] S2, Mixing and Stirring Process II

[0011] Add deionized water, surfactant and synergist to the mixer in step S1 in sequence, mix and stir evenly to obtain the desired mixture II;

[0012] S3, Mixing and Stirring Processing III

[0013] Add the silicone additive and chelating agent to the mixer in step S2, stir evenly, and obtain the desired mixture.

[0014] S4, Filtration Process

[0015] The mixture prepared in step S3 is filtered to obtain the desired liquid water-soluble surfactant for later use.

[0016] S5. Preparation of micelle solutions

[0017] Add the liquid water-soluble surfactant and thickener prepared in step S4 to water, and stir at 60-80℃ to form a micelle solution for later use;

[0018] S6. Finished Product Packaging

[0019] The micelle solution prepared in step S5 is metered and packaged to obtain the required surfactant for balanced fertilizer.

[0020] To further optimize this technical solution, the synergist in step S2 is a mixture of malonic acid and 3,4-dihydroxybenzaldehyde.

[0021] To further optimize this technical solution, in step S1, the urea ammonium nitrate and potassium carbonate are pulverized to 35-50 mesh before stirring and mixing, and then sieved through a 35-50 mesh sieve; the chemical reaction formula of urea ammonium nitrate and potassium carbonate is shown below:

[0022] 2NH4NO3 + K2CO3 → 2KNO3 + CO2 + H2O

[0023] To further optimize this technical solution, the urea ammonium nitrate in step S1 can be replaced by an equal amount of urea.

[0024] To further optimize this technical solution, the trace elements in step S1 are a mixture of amino acid chelated iron, sodium tartrate, ammonium molybdate, amino acid chelated zinc, and boric acid, wherein the sum of the masses of amino acid chelated zinc and boric acid in the trace elements is not less than 90-94 parts of the total mass of the trace elements.

[0025] To further optimize this technical solution, the organosilicon additive in step S3 is a macromolecular organosilicon, and the chelating agent in step S3 is the product of the reaction between disodium hydrogen phosphate and sodium dihydrogen phosphate, with the following chemical formula:

[0026] 2Na2HPO4+NaH2PO4→Na5P3O10+2H2O

[0027] To further optimize this technical solution, the surfactant is composed of sodium dodecylbenzenesulfonate and fatty alcohol polyoxyethylene ether in a mass ratio of 1:1.5.

[0028] To further optimize this technical solution, the micelle solution prepared in step S5 is coated onto the surface of the balanced fertilizer by impregnation or spraying, and dried at 80-100℃ to obtain a special surfactant for balanced fertilizer.

[0029] Beneficial effects

[0030] Compared with the prior art, the present invention provides a surfactant for balanced fertilizer and its preparation method, which has the following beneficial effects:

[0031] 1. The special surfactant for balanced fertilizer and its preparation method. The main components of the fertilizer of this invention are magnesium sulfate heptahydrate, zinc sulfate, manganese sulfate, copper sulfate, ammonium molybdate and sodium borate decahydrate. With the combined use of chelating agents, the chelating agents have good dispersion characteristics and chelating functions, promote crop absorption of nutrients, further improve the absorption and utilization rate of balanced fertilizer, and make trace elements more readily available to plants.

[0032] 2. The surfactant for balanced fertilizer and its preparation method: The addition of surfactant and organosilicon adjuvant in this invention can improve soil structure and retain moisture, making the dispersion system of balanced fertilizer stable during use, resulting in good product activity, reducing fertilizer loss, reducing fertilizer application amount, effectively improving crop yield and quality, and increasing fruit setting rate. In turn, the balanced fertilizer composition prepared by surfactant can improve the utilization rate of balanced fertilizer. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the process for preparing a surfactant for balanced fertilizer proposed in this invention. Detailed Implementation

[0034] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Example 1:

[0036] Please refer to Figure 1 A surfactant for balanced fertilizer comprises the following raw materials in parts by weight: 16 parts urea ammonium nitrate, 2 parts potassium carbonate, 4 parts trace elements, 4 parts synergist, 10 parts surfactant, 2 parts organosilicon additive, 35 parts deionized water, 8 parts chelating agent, 5 parts thickener, and 35 parts fertilizer components; wherein the fertilizer components comprise the following components in parts by weight: 4 parts magnesium sulfate heptahydrate, 8 parts zinc sulfate, 5 parts manganese sulfate, 3 parts copper sulfate, 6 parts ammonium molybdate, and 3 parts sodium borate decahydrate.

[0037] A method for preparing a surfactant specifically for balanced fertilizers includes the following steps:

[0038] S1. Mixing and stirring process

[0039] Urea ammonium nitrate, potassium carbonate, and trace elements are placed in a mixer and stirred. Before mixing, the urea ammonium nitrate and potassium carbonate are pulverized to 35-50 mesh and then sieved through a 35-50 mesh sieve. The chemical reaction formula for urea ammonium nitrate and potassium carbonate is as follows: 2NH4NO3 + K2CO3 → 2KNO3 + CO2 + H2O

[0040] Urea ammonium nitrate can be replaced by an equal amount of urea. The trace elements are a mixture of amino acid chelated iron, sodium tartrate, ammonium molybdate, amino acid chelated zinc and boric acid. The sum of the mass of amino acid chelated zinc and boric acid in the trace elements is not less than 90-94 parts of the total mass of the trace elements. Prepare the required mixture one for later use.

[0041] S2, Mixing and Stirring Process II

[0042] Deionized water, surfactant, and synergist are added sequentially to the mixer in step S1, and the mixture is stirred until homogeneous. The synergist is a mixture of malonic acid and 3,4-dihydroxybenzaldehyde. The surfactant is composed of sodium dodecylbenzenesulfonate and fatty alcohol polyoxyethylene ether in a mass ratio of 1:1.5 to obtain the desired mixture II.

[0043] S3, Mixing and Stirring Processing III

[0044] Add the organosilicon additive and chelating agent to the mixer in step S2, and stir until homogeneous. The organosilicon additive in step S3 is a macromolecular organosilicon, and the chelating agent in step S3 is the product of the reaction between disodium hydrogen phosphate and sodium dihydrogen phosphate, with the following chemical formula:

[0045] 2Na2HPO4+NaH2PO4→Na5P3O10+2H2O

[0046] S4, Filtration Process

[0047] The mixture prepared in step S3 is filtered to obtain the desired liquid water-soluble surfactant for later use.

[0048] S5. Preparation of micelle solutions

[0049] Add the liquid water-soluble surfactant and thickener prepared in step S4 to water, stir at 60-80℃ to form a micelle solution, and coat the surface of the balanced fertilizer with the micelle solution prepared in step S5 by impregnation or spraying, and dry at 80-100℃ to obtain the special surfactant for balanced fertilizer, for later use.

[0050] S6. Finished Product Packaging

[0051] The micelle solution prepared in step S5 is metered and packaged to obtain the required surfactant for balanced fertilizer.

[0052] Example 2:

[0053] Please refer to Figure 1 A surfactant for balanced fertilizer comprises the following raw materials in parts by weight: 17 parts urea ammonium nitrate, 5 parts potassium carbonate, 4 parts trace elements, 2 parts synergist, 8 parts surfactant, 3 parts organosilicon additive, 30 parts deionized water, 5 parts chelating agent, 5 parts thickener, and 30 parts fertilizer components; wherein the fertilizer components comprise the following components in parts by weight: 5 parts magnesium sulfate heptahydrate, 6 parts zinc sulfate, 5 parts manganese sulfate, 3 parts copper sulfate, 6 parts ammonium molybdate, and 3 parts sodium borate decahydrate.

[0054] A method for preparing a surfactant specifically for balanced fertilizers includes the following steps:

[0055] S1. Mixing and stirring process

[0056] Urea ammonium nitrate, potassium carbonate, and trace elements are placed in a mixer and stirred. Before mixing, the urea ammonium nitrate and potassium carbonate are pulverized to 35-50 mesh and then sieved through a 35-50 mesh sieve. The chemical reaction formula for urea ammonium nitrate and potassium carbonate is as follows: 2NH4NO3 + K2CO3 → 2KNO3 + CO2 + H2O

[0057] Urea ammonium nitrate can be replaced by an equal amount of urea. The trace elements are a mixture of amino acid chelated iron, sodium tartrate, ammonium molybdate, amino acid chelated zinc and boric acid. The sum of the mass of amino acid chelated zinc and boric acid in the trace elements is not less than 90-94 parts of the total mass of the trace elements. Prepare the required mixture one for later use.

[0058] S2. Mixing and stirring treatment two: Deionized water, surfactant and synergist are added sequentially to the mixer in step S1, and the mixture is stirred evenly. The synergist is a mixture of malonic acid and 3,4-dihydroxybenzaldehyde. The surfactant is composed of sodium dodecylbenzenesulfonate and fatty alcohol polyoxyethylene ether in a mass ratio of 1:1.5 to obtain the desired mixture two.

[0059] S3, Mixing and Stirring Processing III

[0060] Add the organosilicon additive and chelating agent to the mixer in step S2, and stir until homogeneous. The organosilicon additive in step S3 is a macromolecular organosilicon, and the chelating agent in step S3 is the product of the reaction between disodium hydrogen phosphate and sodium dihydrogen phosphate, with the following chemical formula:

[0061] 2Na₂HPO₄ + NaH₂PO₄ → Na₅P₃O 10 +2H2O;

[0062] S4, Filtration Process

[0063] The mixture prepared in step S3 is filtered to obtain the desired liquid water-soluble surfactant for later use.

[0064] S5. Preparation of micelle solutions

[0065] Add the liquid water-soluble surfactant and thickener prepared in step S4 to water, stir at 60-80℃ to form a micelle solution, and coat the surface of the balanced fertilizer with the micelle solution prepared in step S5 by impregnation or spraying, and dry at 80-100℃ to obtain the special surfactant for balanced fertilizer, for later use.

[0066] S6. Finished Product Packaging

[0067] The micelle solution prepared in step S5 is metered and packaged to obtain the required surfactant for balanced fertilizer.

[0068] Example 3:

[0069] Please refer to Figure 1 A surfactant for balanced fertilizer comprises the following raw materials in parts by weight: 18 parts urea ammonium nitrate, 5 parts potassium carbonate, 6 parts trace elements, 4 parts synergist, 8 parts surfactant, 3 parts organosilicon additive, 40 parts deionized water, 8 parts chelating agent, 5 parts thickener, and 40 parts fertilizer components; wherein the fertilizer components comprise the following components in parts by weight: 8 parts magnesium sulfate heptahydrate, 5 parts zinc sulfate, 2 parts manganese sulfate, 3 parts copper sulfate, 6 parts ammonium molybdate, and 3 parts sodium borate decahydrate.

[0070] A method for preparing a surfactant specifically for balanced fertilizers includes the following steps:

[0071] S1. Mixing and stirring process

[0072] Urea ammonium nitrate, potassium carbonate, and trace elements are placed in a mixer and stirred. Before mixing, the urea ammonium nitrate and potassium carbonate are pulverized to 35-50 mesh and then sieved through a 35-50 mesh sieve. The chemical reaction formula for urea ammonium nitrate and potassium carbonate is as follows: 2NH4NO3 + K2CO3 → 2KNO3 + CO2 + H2O

[0073] Urea ammonium nitrate can be replaced by an equal amount of urea. The trace elements are a mixture of amino acid chelated iron, sodium tartrate, ammonium molybdate, amino acid chelated zinc and boric acid. The sum of the mass of amino acid chelated zinc and boric acid in the trace elements is not less than 90-94 parts of the total mass of the trace elements. Prepare the required mixture one for later use.

[0074] S2, Mixing and Stirring Process II

[0075] Deionized water, surfactant, and synergist are added sequentially to the mixer in step S1, and the mixture is stirred until homogeneous. The synergist is a mixture of malonic acid and 3,4-dihydroxybenzaldehyde. The surfactant is composed of sodium dodecylbenzenesulfonate and fatty alcohol polyoxyethylene ether in a mass ratio of 1:1.5 to obtain the desired mixture II.

[0076] S3, Mixing and Stirring Processing III

[0077] In step S2, an organosilicon additive and a chelating agent are added to the mixer and stirred until homogeneous. In step S3, the organosilicon additive is a macromolecular organosilicon, and the chelating agent is the product of the reaction between disodium hydrogen phosphate and sodium dihydrogen phosphate, with the following chemical formula:

[0078] 2Na2HPO4+NaH2PO4→Na5P3O10+2H2O

[0079] S4, Filtration Process

[0080] The mixture prepared in step S3 is filtered to obtain the desired liquid water-soluble surfactant for later use.

[0081] S5. Preparation of micelle solutions

[0082] Add the liquid water-soluble surfactant and thickener prepared in step S4 to water, stir at 60-80℃ to form a micelle solution, coat the surface of the balanced fertilizer by impregnation or spraying, and dry at 80-100℃ to obtain the special surfactant for balanced fertilizer, for later use.

[0083] S6. Finished Product Packaging

[0084] The micelle solution prepared in step S5 is metered and packaged to obtain the required surfactant for balanced fertilizer.

[0085] Example 4: Please refer to Figure 1 A surfactant for balanced fertilizer comprises the following raw materials in parts by weight: 17 parts urea ammonium nitrate, 5.5 parts potassium carbonate, 5 parts trace elements, 3 parts synergist, 9 parts surfactant, 2.5 parts organosilicon additive, 38 parts deionized water, 7 parts chelating agent, 4 parts thickener, and 33 parts fertilizer components; wherein the fertilizer components comprise the following components in parts by weight: 6 parts magnesium sulfate heptahydrate, 2 parts zinc sulfate, 5 parts manganese sulfate, 3 parts copper sulfate, 6 parts ammonium molybdate, and 3 parts sodium borate decahydrate.

[0086] A method for preparing a surfactant specifically for balanced fertilizers includes the following steps:

[0087] S1. Mixing and stirring process

[0088] Urea ammonium nitrate, potassium carbonate, and trace elements are placed in a mixer and stirred. Before mixing, the urea ammonium nitrate and potassium carbonate are pulverized to 35-50 mesh and then sieved through a 35-50 mesh sieve. The chemical reaction formula for urea ammonium nitrate and potassium carbonate is as follows: 2NH4NO3 + K2CO3 → 2KNO3 + CO2 + H2O

[0089] Urea ammonium nitrate can be replaced by an equal amount of urea. The trace elements are a mixture of amino acid chelated iron, sodium tartrate, ammonium molybdate, amino acid chelated zinc and boric acid. The sum of the mass of amino acid chelated zinc and boric acid in the trace elements is not less than 90 parts of the total mass of the trace elements. Prepare the required mixture one for later use.

[0090] S2, Mixing and Stirring Process II

[0091] Deionized water, surfactant, and synergist are added sequentially to the mixer in step S1, and the mixture is stirred until homogeneous. The synergist is a mixture of malonic acid and 3,4-dihydroxybenzaldehyde. The surfactant is composed of sodium dodecylbenzenesulfonate and fatty alcohol polyoxyethylene ether in a mass ratio of 1:1.5 to obtain the desired mixture II.

[0092] S3, Mixing and Stirring Processing III

[0093] Add the organosilicon additive and chelating agent to the mixer in step S2, and stir until homogeneous. The organosilicon additive in step S3 is a macromolecular organosilicon, and the chelating agent in step S3 is the product of the reaction between disodium hydrogen phosphate and sodium dihydrogen phosphate, with the following chemical formula: 2Na2HPO4 + NaH2PO4 → Na5P3O 10 +2H2O

[0094] S4, Filtration Process

[0095] The mixture prepared in step S3 is filtered to obtain the desired liquid water-soluble surfactant for later use.

[0096] S5. Preparation of micelle solutions

[0097] Add the liquid water-soluble surfactant and thickener prepared in step S4 to water, stir at 60-80℃ to form a micelle solution, and coat the surface of the balanced fertilizer with the micelle solution prepared in step S5 by impregnation or spraying, and dry at 80℃ to obtain the special surfactant for balanced fertilizer, for later use.

[0098] S6. Finished Product Packaging

[0099] The micelle solution prepared in step S5 is metered and packaged to obtain the required surfactant for balanced fertilizer.

[0100] Judgment criteria: Table 1 is a summary table of surfactants for balanced fertilizer prepared in Examples 1 to 4. The results are shown in Table 1 below:

[0101] Example Example 1 Example 2 Example 3 Example 4 Urea ammonium nitrate 16 17 18 17 Potassium carbonate 2 5 5 5.5 Trace elements 4 4 6 5 Synergist 4 2 4 3 surfactants 10 8 8 9 Organosilicon additives 2 3 3 2.5 Deionized water 35 30 40 38 Chelating agents 8 5 8 7 Thickener 5 5 5 4 Fertilizer components 35 30 40 33

[0102] Table 1

[0103] Table 2 shows the experimental results of fruit setting rate (%) and single fruit weight (g) after the application of the special surfactant for balanced fertilizer to different crops:

[0104] See Table 2 below.

[0105]

[0106] Test Results and Evaluation: Analysis and comparison of growth height data of 30 crop plants before and after application of the surfactant for the balanced fertilizer prepared in this invention.

[0107] See Table 3 below:

[0108]

[0109] As shown in Tables 1-3, the crop fruit setting rate (%) and single fruit weight (g) of the surfactant for balanced fertilizer prepared in this invention can be seen from the test data in Table 2 above; the growth height test data is obtained from the test data in Table 3 above; the surfactant for balanced fertilizer prepared in this invention has broad application prospects. Through comparison of four embodiments, the best effect is shown in Embodiment 1. Therefore, Embodiment 1 is selected as the best embodiment. Specific changes in quantity are also within the scope of protection of this technical solution.

[0110] The beneficial effects of this invention are as follows: The surfactant for balanced fertilizer and its preparation method are as follows. The main components of the fertilizer of this invention are magnesium sulfate heptahydrate, zinc sulfate, manganese sulfate, copper sulfate, ammonium molybdate, and sodium borate decahydrate. With the combined use of chelating agents, the chelating agents have good dispersion characteristics and chelating functions, promoting crop nutrient absorption and further improving the absorption and utilization rate of balanced fertilizer. Micronutrients are better utilized by plants. The addition of surfactants and organosilicon adjuvants of this invention can improve soil structure and retain moisture, making the dispersion system of balanced fertilizer stable during use, with good product activity, reducing fertilizer loss, reducing fertilizer application amount, and effectively improving crop yield and quality. In this way, the balanced fertilizer composition prepared by surfactants can improve the utilization rate of balanced fertilizer.

[0111] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A surfactant specifically for balanced fertilizers, characterized in that, The raw materials include the following parts by weight: 16-18 parts of urea ammonium nitrate, 1-6 parts of potassium carbonate, 4-8 parts of trace elements, 2-5 parts of synergist, 8-10 parts of surfactant, 1-5 parts of organosilicon additive, 30-40 parts of deionized water, 5-10 parts of chelating agent, 3-5 parts of thickener, and 30-50 parts of fertilizer components.

2. The surfactant for balanced fertilizer according to claim 1, characterized in that: The fertilizer composition includes the following components by weight: 4-8 parts magnesium sulfate heptahydrate, 2-8 parts zinc sulfate, 2-5 parts manganese sulfate, 1-3 parts copper sulfate, 2-6 parts ammonium molybdate, and 1-3 parts sodium borate decahydrate.

3. A method for preparing a surfactant for balanced fertilizer according to any one of claims 1-2, characterized in that, Includes the following steps: S1. Mixing and stirring process Urea ammonium nitrate, potassium carbonate and trace elements are put into a mixer and stirred to prepare the required mixture one, which is then set aside. S2, Mixing and Stirring Process II Add deionized water, surfactant and synergist to the mixer in step S1 in sequence, mix and stir evenly to obtain the desired mixture II; S3, Mixing and Stirring Processing III Add the silicone additive and chelating agent to the mixer in step S2, stir evenly, and obtain the desired mixture. S4, Filtration Process The mixture prepared in step S3 is filtered to obtain the desired liquid water-soluble surfactant for later use. S5. Preparation of micelle solutions Add the liquid water-soluble surfactant and thickener prepared in step S4 to water, and stir at 60-80℃ to form a micelle solution for later use; S6. Finished product packaging: The micelle solution prepared in step S5 is metered and packaged to obtain the required surfactant for balanced fertilizer.

4. The method for preparing a surfactant for balanced fertilizer according to claim 3, characterized in that, The synergist in step S2 is a mixture of malonic acid and 3,4-dihydroxybenzaldehyde.

5. The method for preparing a surfactant for balanced fertilizer according to claim 3, characterized in that, In step S1, the urea ammonium nitrate and potassium carbonate are pulverized to 35-50 mesh before being stirred and mixed, and then sieved through a 35-50 mesh sieve. The chemical reaction formulas for urea ammonium nitrate and potassium carbonate are shown below: 2NH4NO3+K2CO3→2KNO3+CO2+H2O.

6. The method for preparing a surfactant for balanced fertilizer according to claim 3, characterized in that, The urea ammonium nitrate in step S1 can be replaced by an equal amount of urea.

7. The method for preparing a surfactant for balanced fertilizer according to claim 3, characterized in that, The trace elements in step S1 are a mixture of amino acid chelated iron, sodium tartrate, ammonium molybdate, amino acid chelated zinc, and boric acid. The sum of the masses of amino acid chelated zinc and boric acid in the trace elements is not less than 90-94 parts of the total mass of the trace elements.

8. The method for preparing a surfactant for balanced fertilizer according to claim 3, characterized in that, The organosilicon additive in step S3 is a macromolecular organosilicon, and the chelating agent in step S3 is the product of the reaction between disodium hydrogen phosphate and sodium dihydrogen phosphate, with the following chemical formula: 2Na2HPO4+NaH2PO4→Na5P3O10+2H2O.

9. The method for preparing a surfactant for balanced fertilizer according to claim 3, characterized in that, The surfactant is composed of sodium dodecylbenzenesulfonate and fatty alcohol polyoxyethylene ether in a mass ratio of 1:1.

5.

10. The method for preparing a surfactant for balanced fertilizer according to claim 3, characterized in that, The micelle solution prepared in step S5 is coated onto the surface of the balanced fertilizer by immersion or spraying, and then dried at 80-100℃ to obtain a special surfactant for balanced fertilizer.

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