Special soil testing formula fertilizer for wheat-cotton system and preparation method of special soil testing formula fertilizer

Abstract

The invention relates to a special soil testing formula fertilizer for a wheat cotton system and a preparation method thereof, and belongs to the technical field of fertilizers. The preparation method comprises the following steps: creatively taking pretreated straws fermented by an EM microbial agent, livestock and poultry manure and vinasse as organic fertilizers, monoammonium phosphate, urea and potassium chloride as inorganic fertilizers, and mint, plantain herb and radix stemonae as a Chinese herbal medicine mixture, and sequentially mixing and granulating the three components with trace elements and an adhesive to prepare a first component; then coating the first component with a coating solution obtained by sequentially dissolving chitosan in deionized water / glacial acetic acid, cross-linking glutaraldehyde and mixing polyglutamic acid, and finally drying to obtain the soil testing formula fertilizer, which is very suitable for being applied to the planting of a wheat and cotton system, and has the advantages of high nutrient utilization rate and high yield. The yield of wheat and cotton is effectively improved, and the market application prospect is very good.

Description

Technical Field

[0001] The invention belongs to the technical field of fertilizers, and in particular relates to a soil testing formula fertilizer special for wheat and cotton systems and a preparation method thereof. Background Art

[0002] The wheat-cotton system is an agricultural production system that combines wheat and cotton planting. A large number of studies have shown that the planting pattern of the wheat-cotton system can effectively form a high-low composite group structure, make full use of vertical space, and increase the number of crops planted and the output per unit area of ​​land. Among them, planting with special soil-tested and formulated fertilizers on the basis of the wheat-cotton system can often bring more substantial benefits. The so-called soil-tested and formulated fertilizers are based on soil testing and fertilizer field trials. According to the fertilizer requirements of crops, soil fertilizer supply performance and fertilizer effects, on the basis of reasonable application of organic fertilizers, the application amount and application method of fertilizers such as nitrogen, phosphorus, potassium and medium and trace elements are proposed. However, the existing special soil-tested and formulated fertilizers for wheat-cotton systems still have certain disadvantages that limit their actual application effect. This is because, on the one hand, these special soil-tested and formulated fertilizers for wheat-cotton systems are still insufficient to increase yields. On the other hand, they are similar to ordinary fertilizers, and the utilization rate of nutrients is not high. Most of the nutrients are lost before crops have a chance to absorb them, which not only causes waste but also is not conducive to crop growth. Summary of the Invention

[0003] In response to the problems existing in the prior art, the present invention aims to provide a soil-testing formula fertilizer specifically for wheat-cotton systems and a preparation method thereof. The present invention creatively uses pretreated straw, livestock manure and wine lees fermented with EM microbial agents as organic fertilizers, monoammonium phosphate, urea and potassium chloride as inorganic fertilizers, and mint, plantain and stemonae as a mixture of Chinese herbal medicines, so that the three are mixed with trace elements and an adhesive in sequence and granulated to prepare a first component. The first component is then coated with a coating solution obtained by dissolving chitosan in deionized water / glacial acetic acid, cross-linking with glutaraldehyde and mixing with polyglutamic acid, and finally dried to obtain a soil-testing formula fertilizer that is very suitable for use in the cultivation of wheat-cotton systems, has a high nutrient utilization rate, effectively increases the yield of wheat and cotton, and has very good market application prospects.

[0004] The purpose of the present invention can be achieved through the following technical solutions:

[0005] A method for preparing a soil-testing formula fertilizer specifically for wheat and cotton systems, the method comprising the following steps:

[0006] Step A: 40-50 parts by weight of organic fertilizer, inorganic fertilizer, 3-5 parts by weight of a Chinese herbal medicine mixture, 0.5-1 parts by weight of trace elements, and 8-10 parts by weight of a binder are mixed, and granulated using a disc granulator to obtain a first component;

[0007] Step B: coating the first component with a coating liquid in a coating pan, drying, and forming a coating layer with a thickness of 80-100 microns. The preparation is completed.

[0008] As a preferred technical solution of the present invention, the organic fertilizer described in step A is prepared by the following steps:

[0009] The pretreated straw, livestock manure and wine dregs are mixed in a mass ratio of 8:2-3:1-2, and then deionized water is added until the water content is 45-50% to obtain a fermentation material; the fermentation material, brown sugar and EM bacterial agent are mixed in a mass ratio of 500:10-12:1-1.5, and then fermented at room temperature for 7-8 days, and finally vacuum dried at 30-35°C for 20-24 hours, crushed, and passed through a 10-30 mesh sieve to complete the preparation.

[0010] Furthermore, the pre-treatment of the corn straw refers to crushing the corn straw and passing it through a 10-20 mesh sieve.

[0011] Furthermore, the livestock manure is cow dung.

[0012] As a preferred technical solution of the present invention, the inorganic fertilizer in step A includes monoammonium phosphate, urea and potassium chloride; the phosphorus element of the inorganic fertilizer accounts for 4-5% of the weight of the first component; the nitrogen element of the inorganic fertilizer accounts for 10-12% of the weight of the first component; and the potassium element of the inorganic fertilizer accounts for 8-10% of the weight of the first component.

[0013] As a preferred technical solution of the present invention, the Chinese herbal medicine mixture in step A is prepared by the following steps:

[0014] The mint, plantain and stemonae are mixed in a mass ratio of 1:1-2:0.5-1, crushed, and passed through a 10-30 mesh sieve to complete the preparation.

[0015] As a preferred technical solution of the present invention, the trace elements in step A include ferrous sulfate, zinc sulfate, magnesium sulfate, copper sulfate and manganese sulfate; the mass ratio of the ferrous sulfate, the zinc sulfate, the magnesium sulfate, the copper sulfate and the manganese sulfate is 1:0.5-1:0.3:0.5-1:0.8.

[0016] As a preferred technical solution of the present invention, the adhesive in step A is prepared by the following steps:

[0017] The preparation is completed by mixing bentonite and deionized water in a mass ratio of 9-10:3-4.

[0018] As a preferred technical solution of the present invention, the particle size of the granulation in step A is 5 mm.

[0019] As a preferred technical solution of the present invention, the working parameters of the coating pan in step B are as follows: the inlet air temperature is controlled at 50-60°C, and the outlet air temperature is controlled at 35-40°C.

[0020] As a preferred technical solution of the present invention, the coating solution in step B is prepared by the following steps:

[0021] Add 1-2 parts by weight of glacial acetic acid and 2-3 parts by weight of chitosan to 60-80 parts by weight of deionized water, then stir at room temperature until completely dissolved, add 0.2-0.25 parts by weight of glutaraldehyde, continue stirring for 18-20 hours, then add 0.5-1 parts by weight of polyglutamic acid, stir for 30-60 minutes, and the preparation is complete.

[0022] As a preferred technical solution of the present invention, the drying in step B refers to drying at 40-50° C. for 24 hours.

[0023] A soil testing formula fertilizer specially used for wheat and cotton system is prepared by the preparation method described above.

[0024] Beneficial effects of the present invention:

[0025] (1) The present invention creatively uses pretreated straw, livestock manure and wine dregs fermented with EM microbial agent as organic fertilizer, monoammonium phosphate, urea and potassium chloride as inorganic fertilizer, and mint, plantain and stemona as a mixture of Chinese herbal medicines, so that the three are mixed with trace elements and adhesives in sequence and granulated to prepare a first component, and then the first component is coated with a coating solution obtained by dissolving chitosan in deionized water / glacial acetic acid, cross-linking with glutaraldehyde and mixing with polyglutamic acid, and finally dried to obtain a soil-testing formula fertilizer, which is very suitable for use in the cultivation of wheat and cotton systems, has high nutrient utilization, effectively increases the yield of wheat and cotton, and has very good market application prospects.

[0026] (2) The present invention creatively compounds a Chinese herbal medicine mixture consisting of mint, plantain and stemona on the basis of organic fertilizers, inorganic fertilizers and trace elements, so as to promote the absorption of nutrients of soil-tested fertilizer formula by the wheat and cotton system during the planting process, thereby increasing the yield. Mint, as a perennial herb of the Lamiaceae family, is rich in flavonoids and terpenoid compounds, and has a good inhibitory and regulatory effect on relevant crop pathogens, effectively ensuring the healthy growth of wheat and cotton, especially for the early stage of planting, the effect is particularly obvious. Plantain itself contains a certain amount of nutrients, which can not only provide nitrogen, phosphorus, potassium and other elements, but also is conducive to the formation of beneficial microbial communities, indirectly promoting the absorption of nutrients by wheat and cotton. As for stemona, it contains a variety of different alkaloids, which mainly play a strong allelopathic role, and produce excellent synergistic effects with mint and plantain, thereby enhancing the stress resistance and adaptability of wheat and cotton.

[0027] (3) In order to solve the problem that nutrients in fertilizers are easily lost and their utilization rate is low, the present invention creatively uses a coating solution obtained by successively dissolving chitosan in deionized water / glacial acetic acid, cross-linking with glutaraldehyde, and mixing polyglutamic acid to coat the fertilizer, thereby enhancing stability, achieving a sustained release effect, and improving utilization rate. On the one hand, chitosan has high strength after cross-linking with glutaraldehyde, which fundamentally provides feasibility for coating. On the other hand, polyglutamic acid itself acts as a synergist for fertilizers, which can amplify the efficacy of fertilizers. At the same time, when it is used as part of the coating layer, Afterwards, it can form hydrogen bonds with the cross-linked chitosan by virtue of its large number of carboxyl groups, thereby improving the crystallinity to a certain extent and changing the sustained-release behavior. It is not only more suitable for the planting and application of the wheat-cotton system, but also promotes the strength of the coating layer. In addition, the time of adding polyglutamic acid in the preparation process of the coating solution is very critical. Since it contains amino groups, it can also react with the aldehyde group of glutaraldehyde. Therefore, if polyglutamic acid is added in advance and then cross-linked, the crystallinity of the coating layer will be changed, which will have an adverse effect on the sustained-release effect and correspondingly reduce the yield of wheat and cotton. DETAILED DESCRIPTION

[0028] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in combination with the embodiments.

[0029] The EM bacterial agents in all the embodiments and comparative examples of the present invention were purchased directly from the market, purchased from Luoyang Oukebaik Biotechnology Co., Ltd., product number OKH0601; chitosan was purchased directly from the market, purchased from Shanghai Aladdin Biochemical Technology Co., Ltd., product number C105799; polyglutamic acid was purchased directly from the market, purchased from Shenzhen Lefu Biotechnology Co., Ltd., product number LF0902.

[0030] Example 1

[0031] A method for preparing a soil-testing formula fertilizer specifically for wheat and cotton systems, the method comprising the following steps:

[0032] Step A: 40 parts by weight of organic fertilizer, inorganic fertilizer, 3 parts by weight of a Chinese herbal medicine mixture, 0.5 parts by weight of trace elements, and 8 parts by weight of a binder are mixed and granulated using a disc granulator to obtain a first component;

[0033] Step B: coating the first component with a coating liquid in a coating pan, drying, and forming a coating layer with a thickness of 80 microns. The preparation is completed.

[0034] The organic fertilizer described in step A is prepared by the following steps:

[0035] The pretreated straw, livestock manure and wine dregs are mixed in a mass ratio of 8:2:1, and then deionized water is added until the water content is 45% to obtain a fermentation material; the fermentation material, brown sugar and EM bacterial agent are mixed in a mass ratio of 500:10:1, and then fermented at room temperature for 7 days, and finally vacuum dried at 30°C for 20 hours, crushed, and passed through a 10-mesh sieve to complete the preparation.

[0036] The straw pretreatment is to crush the corn straw and pass it through a 10-mesh sieve.

[0037] The livestock excrement is cow dung.

[0038] In step A, the inorganic fertilizer comprises monoammonium phosphate, urea and potassium chloride; the phosphorus element of the inorganic fertilizer accounts for 4% of the weight of the first component; the nitrogen element of the inorganic fertilizer accounts for 10% of the weight of the first component; and the potassium element of the inorganic fertilizer accounts for 8% of the weight of the first component.

[0039] The Chinese herbal medicine mixture described in step A is prepared by the following steps:

[0040] Mix mint, plantain and stemona root in a mass ratio of 1:1:0.5, grind, and pass through a 10-mesh sieve to complete the preparation.

[0041] The trace elements in step A include ferrous sulfate, zinc sulfate, magnesium sulfate, copper sulfate and manganese sulfate; the mass ratio of the ferrous sulfate, the zinc sulfate, the magnesium sulfate, the copper sulfate and the manganese sulfate is 1:0.5:0.3:0.5:0.8.

[0042] The adhesive of step A is prepared by the following steps:

[0043] The preparation is completed by mixing bentonite and deionized water in a mass ratio of 9:3.

[0044] The particle size of the granulation in step A is 5 mm.

[0045] The working parameters of the coating pan in step B are as follows: the inlet air temperature is controlled at 50°C and the outlet air temperature is controlled at 35°C.

[0046] The coating solution of step B is prepared by the following steps:

[0047] Add 1 part by weight of glacial acetic acid and 2 parts by weight of chitosan to 60 parts by weight of deionized water, then stir at room temperature until completely dissolved, add 0.2 parts by weight of glutaraldehyde, continue stirring for 18 hours, then add 0.5 parts by weight of polyglutamic acid, stir for 30 minutes, and the preparation is complete.

[0048] The drying in step B refers to drying at 40° C. for 24 hours.

[0049] A soil testing formula fertilizer specially used for wheat and cotton system is prepared by the preparation method described above.

[0050] Example 2

[0051] A method for preparing a soil-testing formula fertilizer specifically for wheat and cotton systems, the method comprising the following steps:

[0052] Step A: 50 parts by weight of organic fertilizer, inorganic fertilizer, 5 parts by weight of a Chinese herbal medicine mixture, 1 part by weight of trace elements, and 10 parts by weight of a binder are mixed, and granulated using a disc granulator to obtain a first component;

[0053] Step B: coating the first component with a coating liquid in a coating pan, drying, and forming a coating layer with a thickness of 100 microns. The preparation is completed.

[0054] The organic fertilizer described in step A is prepared by the following steps:

[0055] The pretreated straw, livestock manure and wine dregs are mixed in a mass ratio of 8:3:2, and then deionized water is added until the water content is 50% to obtain a fermentation material; the fermentation material, brown sugar and EM bacterial agent are mixed in a mass ratio of 500:12:1.5, and then fermented at room temperature for 8 days, and finally vacuum dried at 35°C for 24 hours, crushed, and passed through a 30-mesh sieve to complete the preparation.

[0056] The straw pretreatment is to crush the corn straw and pass it through a 20-mesh sieve.

[0057] The livestock excrement is cow dung.

[0058] In step A, the inorganic fertilizer comprises monoammonium phosphate, urea and potassium chloride; the phosphorus element of the inorganic fertilizer accounts for 5% of the weight of the first component; the nitrogen element of the inorganic fertilizer accounts for 12% of the weight of the first component; and the potassium element of the inorganic fertilizer accounts for 10% of the weight of the first component.

[0059] The Chinese herbal medicine mixture described in step A is prepared by the following steps:

[0060] Mix mint, plantain and stemona root in a mass ratio of 1:2:1, grind, and pass through a 30-mesh sieve to complete the preparation.

[0061] The trace elements in step A include ferrous sulfate, zinc sulfate, magnesium sulfate, copper sulfate and manganese sulfate; the mass ratio of the ferrous sulfate, the zinc sulfate, the magnesium sulfate, the copper sulfate and the manganese sulfate is 1:1:0.3:1:0.8.

[0062] The adhesive of step A is prepared by the following steps:

[0063] The preparation is completed by mixing bentonite and deionized water in a mass ratio of 10:4.

[0064] The particle size of the granulation in step A is 5 mm.

[0065] The working parameters of the coating pan in step B are as follows: the inlet air temperature is controlled at 60°C, and the outlet air temperature is controlled at 40°C.

[0066] The coating solution of step B is prepared by the following steps:

[0067] Add 2 parts by weight of glacial acetic acid and 3 parts by weight of chitosan to 80 parts by weight of deionized water, then stir at room temperature until completely dissolved, add 0.25 parts by weight of glutaraldehyde, continue stirring for 20 hours, then add 1 part by weight of polyglutamic acid, stir for 60 minutes, and the preparation is complete.

[0068] The drying in step B refers to drying at 50° C. for 24 hours.

[0069] A soil testing formula fertilizer specially used for wheat and cotton system is prepared by the preparation method described above.

[0070] Example 3

[0071] A method for preparing a soil-testing formula fertilizer specifically for wheat and cotton systems, the method comprising the following steps:

[0072] Step A: 45 parts by weight of organic fertilizer, inorganic fertilizer, 4 parts by weight of a Chinese herbal medicine mixture, 0.8 parts by weight of trace elements, and 9 parts by weight of a binder are mixed and granulated using a disc granulator to obtain a first component;

[0073] Step B: coating the first component with a coating liquid in a coating pan, drying, and forming a coating layer with a thickness of 90 microns. The preparation is completed.

[0074] The organic fertilizer described in step A is prepared by the following steps:

[0075] The pretreated straw, livestock manure and wine dregs were mixed in a mass ratio of 8:2.5:1.5, and then deionized water was added until the water content was 47% to obtain a fermentation material; the fermentation material, brown sugar and EM bacterial agent were mixed in a mass ratio of 500:11:1.3, and then fermented at room temperature for 7 days, and finally vacuum dried at 33°C for 22 hours, crushed, and passed through a 20-mesh sieve to complete the preparation.

[0076] The straw pretreatment is to crush the corn straw and pass it through a 15-mesh sieve.

[0077] The livestock excrement is cow dung.

[0078] In step A, the inorganic fertilizer comprises monoammonium phosphate, urea and potassium chloride; the phosphorus element of the inorganic fertilizer accounts for 4.5% of the weight of the first component; the nitrogen element of the inorganic fertilizer accounts for 11% of the weight of the first component; and the potassium element of the inorganic fertilizer accounts for 9% of the weight of the first component.

[0079] The Chinese herbal medicine mixture described in step A is prepared by the following steps:

[0080] Mix mint, plantain and stemona root in a mass ratio of 1:1.5:0.8, grind, and pass through a 20-mesh sieve to complete the preparation.

[0081] The trace elements in step A include ferrous sulfate, zinc sulfate, magnesium sulfate, copper sulfate and manganese sulfate; the mass ratio of the ferrous sulfate, the zinc sulfate, the magnesium sulfate, the copper sulfate and the manganese sulfate is 1:0.8:0.3:0.7:0.8.

[0082] The adhesive of step A is prepared by the following steps:

[0083] The preparation is completed by mixing bentonite and deionized water in a mass ratio of 9.5:3.5.

[0084] The particle size of the granulation in step A is 5 mm.

[0085] The working parameters of the coating pan in step B are as follows: the inlet air temperature is controlled at 55°C, and the outlet air temperature is controlled at 38°C.

[0086] The coating solution of step B is prepared by the following steps:

[0087] To 70 parts by weight of deionized water, add 1.5 parts by weight of glacial acetic acid and 2.5 parts by weight of chitosan, then stir at room temperature until completely dissolved, add 0.23 parts by weight of glutaraldehyde, continue stirring for 19 hours, then add 0.8 parts by weight of polyglutamic acid, stir for 45 minutes, and the preparation is complete.

[0088] The drying in step B refers to drying at 45° C. for 24 hours.

[0089] A soil testing formula fertilizer specially used for wheat and cotton system is prepared by the preparation method described above.

[0090] Comparative Example 1

[0091] On the basis of Example 3, mint was changed to plantain of equal weight, and the rest remained unchanged.

[0092] Comparative Example 2

[0093] On the basis of Example 3, plantain was changed to mint of equal weight, and the rest remained unchanged.

[0094] Comparative Example 3

[0095] On the basis of Example 3, the stemonae were changed to peppermint of equal weight, and the rest remained unchanged.

[0096] Comparative Example 4

[0097] On the basis of Example 3, the stemonae were changed to plantain of equal weight, and the rest remained unchanged.

[0098] Comparative Example 5

[0099] Based on Example 3, the Chinese herbal medicine mixture was not added in step A, and the rest remained unchanged.

[0100] Comparative Example 6

[0101] Based on Example 3, the polyglutamic acid was replaced with an equal weight of deionized water, and the rest remained unchanged.

[0102] Comparative Example 7

[0103] Based on Example 3, the preparation steps of the coating solution were changed to add 1.5 parts by weight of glacial acetic acid, 2.5 parts by weight of chitosan and 0.8 parts by weight of polyglutamic acid to 70 parts by weight of deionized water, and then stirred at room temperature until completely dissolved, and 0.23 parts by weight of glutaraldehyde was added, and stirring was continued for 19 hours to complete the preparation; the rest remained unchanged.

[0104] Comparative Example 8

[0105] Based on Example 3, step B was omitted and the rest remained unchanged.

[0106] Test Example 1

[0107] Wheat-cotton system planting test:

[0108] Ten experimental plots of equal area and identical soil properties were divided for planting wheat-cotton system, specifically "three-in-one" wheat-cotton intercropping. During the planting period, the soil-testing formula fertilizers for wheat-cotton system prepared in Example 3 and Comparative Examples 1-8 were used for fertilization (one of the plots was a blank group, fertilized with conventional compound fertilizers, which were sourced from Anhui Salt Fertilizer Co., Ltd., and the product name was Gaota Chloro-25-13-7). The yield increase of wheat and cotton in the first round of maturity relative to the blank group was calculated, i.e., the yield increase rate, rounded to the nearest integer (the area of ​​the experimental plots was 1000 square meters). 1,000 square meters, wheat will be sown on October 1, 2022, and cotton will be sown on April 15 of the following year. Fertilizers will be applied to wheat and cotton before sowing, with the dosage being 70 kg per mu for wheat and 50 kg per mu for cotton respectively. Fertilizer will be applied again 150 days, 190 days and 220 days after wheat sowing, with the dosage being 20 kg per mu, 20 kg per mu and 15 kg per mu respectively. Fertilizer will be applied again 65 days, 85 days, 110 days and 150 days after cotton sowing, with the dosage being 10 kg per mu, 15 kg per mu, 15 kg per mu and 8 kg per mu respectively).

[0109] Table 1. Wheat-cotton system planting test results

[0110] Wheat yield increase rate / % Cotton yield increase rate / % Example 3 19.3 8.4 Comparative Example 1 16.6 6.0 Comparative Example 2 17.0 6.5 Comparative Example 3 16.3 7.0 Comparative Example 4 16.8 6.8 Comparative Example 5 14.5 4.9 Comparative Example 6 16.1 6.6 Comparative Example 7 15.7 6.3 Comparative Example 8 12.9 5.2

[0111] From Test Example 1, it can be seen from the comparison between Example 3 and Comparative Examples 1-8 that the soil-tested formula fertilizer specially prepared for the wheat-cotton system of the present invention can achieve a more excellent planting effect, and the yield of both wheat and cotton is greatly improved.

[0112] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make some changes or modifications to equivalent embodiments using the technical contents disclosed above. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A method for preparing a soil testing formula fertilizer specifically for wheat and cotton system, characterized in that: The preparation method comprises the following steps: Step A: 40-50 parts by weight of organic fertilizer, inorganic fertilizer, 3-5 parts by weight of a Chinese herbal medicine mixture, 0.5-1 parts by weight of trace elements and 8-10 parts by weight of a binder are mixed, and granulated using a disc granulator to obtain a first component; Step B: coating the first component with a coating liquid in a coating pan, drying, and forming a coating layer with a thickness of 80-100 microns, and the preparation is completed.

2. The method for preparing a soil testing formula fertilizer specifically for wheat and cotton system according to claim 1, characterized in that: The organic fertilizer described in step A is prepared by the following steps: The pretreated straw, livestock manure and wine dregs are mixed in a mass ratio of 8:2-3:1-2, and then deionized water is added until the water content is 45-50% to obtain a fermentation material; the fermentation material, brown sugar and EM bacterial agent are mixed in a mass ratio of 500:10-12:1-1.5, and then fermented at room temperature for 7-8 days, and finally vacuum dried at 30-35°C for 20-24h, crushed, and passed through a 10-30 mesh sieve to complete the preparation.

3. The method for preparing a soil testing formula fertilizer specifically for wheat and cotton system according to claim 1, characterized in that: In step A, the inorganic fertilizer comprises monoammonium phosphate, urea and potassium chloride; the phosphorus element of the inorganic fertilizer accounts for 4-5% of the weight of the first component; the nitrogen element of the inorganic fertilizer accounts for 10-12% of the weight of the first component; and the potassium element of the inorganic fertilizer accounts for 8-10% of the weight of the first component.

4. The method for preparing a soil testing formula fertilizer specifically for wheat and cotton system according to claim 1, characterized in that: The Chinese herbal medicine mixture described in step A is prepared by the following steps: The preparation is completed by mixing mint, plantain and stemona in a mass ratio of 1:1-2:0.5-1, crushing, and passing through a 10-30 mesh sieve.

5. The method for preparing a soil testing formula fertilizer specifically for wheat and cotton system according to claim 1, characterized in that: The trace elements in step A include ferrous sulfate, zinc sulfate, magnesium sulfate, copper sulfate and manganese sulfate; the mass ratio of the ferrous sulfate, the zinc sulfate, the magnesium sulfate, the copper sulfate and the manganese sulfate is 1:0.5-1:0.3:0.5-1:0.

8.

6. The method for preparing a soil testing formula fertilizer specifically for wheat and cotton system according to claim 1, characterized in that: The adhesive of step A is prepared by the following steps: The preparation is completed by mixing bentonite and deionized water in a mass ratio of 9-10:3-4.

7. The method for preparing a soil testing formula fertilizer specifically for wheat and cotton system according to claim 1, characterized in that: The working parameters of the coating pan in step B are as follows: the inlet air temperature is controlled at 50-60°C, and the outlet air temperature is controlled at 35-40°C.

8. The method for preparing a soil testing formula fertilizer specifically for wheat and cotton system according to claim 1, characterized in that: The coating solution in step B is prepared by the following steps: Add 1-2 parts by weight of glacial acetic acid and 2-3 parts by weight of chitosan to 60-80 parts by weight of deionized water, and then stir at room temperature until completely dissolved, add 0.2-0.25 parts by weight of glutaraldehyde, continue stirring for 18-20 hours, then add 0.5-1 parts by weight of polyglutamic acid, stir for 30-60 minutes, and the preparation is complete.

9. The method for preparing a soil testing formula fertilizer specifically for wheat and cotton system according to claim 1, characterized in that: The drying in step B refers to drying at 40-50° C. for 24 hours.

10. A soil testing formula fertilizer specially used for wheat-cotton system prepared by the preparation method according to any one of claims 1 to 9.