Disease-resistant water-soluble fertilizer

By adding a specific proportion of components such as potassium dihydrogen phosphate and manganese sulfate to the water-soluble fertilizer, combined with biologically active ingredients such as trans asarum ether and lemon essential oil, the problem of low content of active ingredients in existing water-soluble fertilizers is solved, and the crop's disease resistance and environmental friendliness are significantly improved.

CN119859077APending Publication Date: 2025-04-22SHANDONG ACADEMY OF AGRICULTURAL SCIENCES
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Patent Information

Application Number
CN202411911257.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-24
Publication Date
2025-04-22

AI Technical Summary

Technical Problem

The existing solid powder-based water-soluble fertilizer has low active ingredients, resulting in limited improvement in the disease resistance of crops.

Method used

A disease-resistant water-soluble fertilizer is used, including potassium dihydrogen phosphate, manganese sulfate, potassium sulfate, trans asarum, lemon essential oil, eugenol, vitamin C, vitamin E, calcium chloride, sodium chloride and biological agents. Through the reasonable proportion and combination of these components, the crop's disease resistance is enhanced.

Benefits of technology

It improves the disease resistance of crops, reduces the frequency and severity of diseases, and reduces the negative impact on the environment, and extends the shelf life of water-soluble fertilizers.

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Abstract

The invention provides a disease-resistant water-soluble fertilizer, and belongs to the technical field of crop control. The disease-resistant water-soluble fertilizer comprises 15-25 parts of monopotassium phosphate, 10-15 parts of manganese sulfate, 10-15 parts of potassium sulfate, 8-15 parts of trans-asarone, 8-15 parts of lemon essential oil, 8-15 parts of eugenol, 5-10 parts of vitamin C, 5-10 parts of vitamin E, 3-8 parts of calcium chloride, 3-8 parts of sodium chloride and 10-15 parts of a biological agent. The disease-resistant water-soluble fertilizer provided by the invention provides rich nutrient elements for crop soil, and has a remarkable growth promoting effect on crop growth; besides, the properties such as stress resistance, oxidation resistance and disease resistance of crops can be remarkably improved, so that the crops have higher disease resistance, and finally, the crops have higher yield and quality.
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Description

Technical Field

[0001] The invention relates to the technical field of crop prevention and treatment, and in particular to a disease-resistant water-soluble fertilizer. Background Art

[0002] Water-soluble fertilizer is a multi-component compound fertilizer that can be completely soluble in water. It can dissolve quickly in water and is more easily absorbed and utilized by crops. The main functions of water-soluble fertilizers include providing nutrition for crops, improving crop disease resistance, increasing crop yields, and improving the quality of agricultural products. Compared with traditional superphosphate and granulated compound fertilizers, water-soluble fertilizers have the advantages of small dosage, convenient use, low cost, fast crop absorption, and high fertilizer utilization rate. In addition, they can be applied to facility agriculture such as sprinkler and drip irrigation to achieve water-fertilizer integration and achieve the effect of saving water, fertilizer, and labor. Its origin can be traced back to the mid-20th century. At that time, with the development of agricultural irrigation technology, especially the rise of water-saving irrigation technologies such as drip irrigation and sprinkler irrigation, traditional solid fertilizers were prone to blockage and other problems in these irrigation systems. In order to adapt to new irrigation methods and meet the needs of efficient fertilization, water-soluble fertilizers came into being.

[0003] In modern agricultural production, crop diseases have always been a key factor affecting yield and quality. According to statistics, the annual crop loss caused by diseases in the world can reach 20%-40%. The traditional prevention and control method mainly uses chemical pesticides, but the long-term and large-scale use of chemical pesticides has brought many problems, such as pesticide residues, environmental pollution, and increased resistance of pests. In order to find a more environmentally friendly and efficient way to prevent and control diseases, disease-resistant water-soluble fertilizers came into being. For example, in vegetable cultivation, common diseases such as downy mildew of cucumbers and late blight of tomatoes occur frequently. Disease-resistant water-soluble fertilizers can provide nutrients for crops while enhancing the disease resistance of crops themselves and reducing the frequency and severity of diseases.

[0004] Compared with traditional chemical pesticides, the use of disease-resistant water-soluble fertilizers can reduce the amount of chemical pesticides applied. The large-scale use of chemical pesticides will cause environmental problems such as pesticide residues, soil pollution and water pollution. Disease-resistant water-soluble fertilizers mainly prevent and control diseases by enhancing the disease resistance of plants themselves, reducing the negative impact on the environment. However, the current water-soluble fertilizer products on the domestic market are mainly in the form of solid powder and liquid. Most solid powder water-soluble fertilizers have low content of active ingredients, low plant utilization rate, and limited improvement in crop disease resistance. Based on this, it is of great practical significance to provide a disease-resistant water-soluble fertilizer with a high content of active ingredients that can improve crop disease resistance. Summary of the invention

[0005] The purpose of the present invention is to provide a disease-resistant water-soluble fertilizer, aiming to solve the technical problems in the prior art that the solid powder water-soluble fertilizer has a low content of effective ingredients and has limited improvement on the disease resistance of crops.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0007] The present invention provides a disease-resistant water-soluble fertilizer, comprising the following components:

[0008] Potassium dihydrogen phosphate, manganese sulfate, potassium sulfate, trans-asarone, lemon essential oil, eugenol, vitamin C, vitamin E, calcium chloride, sodium chloride and biological bacteria agent.

[0009] Furthermore, the mass parts of the components are: 15-25 parts of potassium dihydrogen phosphate, 10-15 parts of manganese sulfate, 10-15 parts of potassium sulfate, 8-15 parts of trans-asarone, 8-15 parts of lemon essential oil, 8-15 parts of eugenol, 5-10 parts of vitamin C, 5-10 parts of vitamin E, 3-8 parts of calcium chloride, 3-8 parts of sodium chloride and 10-15 parts of biological bacterial agent.

[0010] Furthermore, the biological agent is one or more of actinomycetes, Bacillus subtilis and Bacillus amyloliquefaciens.

[0011] The present invention also provides a method for preparing the disease-resistant water-soluble fertilizer described in the above technical solution, comprising the following steps:

[0012] Dissolving potassium dihydrogen phosphate, manganese sulfate and potassium sulfate in water for a first mixing to obtain a disease-resistant water-soluble fertilizer matrix;

[0013] Adding calcium chloride and sodium chloride to the disease-resistant water-soluble fertilizer matrix and mixing them to obtain a first mixture;

[0014] Trans-asarone, lemon essential oil, eugenol, vitamin C, vitamin E and biological bacterial agent are added to the first mixture for a second mixing to obtain the disease-resistant water-soluble fertilizer.

[0015] Furthermore, the mass ratio of potassium dihydrogen phosphate to water in the first mixture is 2-3:4-6.

[0016] Furthermore, the temperature of the first mixing is 35-45° C., and the time is 40-60 minutes.

[0017] Furthermore, the temperature of the second mixing is 25-30° C., and the time is 20-30 minutes.

[0018] Furthermore, the second mixing is to add the first mixture, trans-asarone, lemon essential oil, eugenol, vitamin C, vitamin E and biological bacterial agent into a high-speed mixer for mixing, stirring and extruding, and then granulating with a granulator and drying to form.

[0019] The present invention also provides the use of the disease-resistant water-soluble fertilizer described in the above technical solution or the disease-resistant water-soluble fertilizer obtained by the preparation method described in the above technical solution in crop prevention and control.

[0020] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0021] (1) Potassium dihydrogen phosphate, manganese sulfate, potassium sulfate, calcium chloride and sodium chloride are added to the disease-resistant water-soluble fertilizer of the present invention, which provides rich elements such as phosphorus, potassium and manganese, and has a significant promoting effect on the growth of crops; wherein potassium dihydrogen phosphate and potassium sulfate can regulate the physiological and biochemical processes in the plant body to enhance stress resistance, it can regulate the osmotic pressure in the plant cells, so that the cells can maintain normal turgor pressure to a certain extent, and ensure the normal operation of the physiological functions of the plants; the manganese element in manganese sulfate can participate in the synthesis of antioxidant enzymes such as superoxide dismutase (SOD) in the plant body, help crops to remove excessive active oxygen free radicals in the body, and reduce the damage of oxidative stress to crops. When crops are subjected to adverse stress, such as heavy metal pollution, high temperature, etc., the supply of manganese sulfate can enhance the antioxidant capacity of crops and maintain the normal physiological functions of crop cells. The present invention provides rich nutrient elements for crop growth by adding potassium dihydrogen phosphate, manganese sulfate, potassium sulfate, calcium chloride and sodium chloride, and enhances the stress resistance and antioxidant properties of crops;

[0022] (2) The present invention further adds trans-asarone, lemon essential oil and eugenol, wherein trans-asarone and lemon essential oil have certain antibacterial activity, can inhibit the growth and reproduction of some plant pathogens and pests, reduce the risk of crop infection, reduce the damage of pests to plants, and the breeding and spread of pathogens on the surface of plants, thereby indirectly promoting the growth and development of crops, and eugenol has a strong bactericidal power, can inhibit the growth and reproduction of some harmful microorganisms that may exist in water-soluble fertilizers, prevent the water-soluble fertilizers from deteriorating and mildewing during storage and use, extend the shelf life of the water-soluble fertilizers, and can also reduce crop diseases caused by microbial breeding;

[0023] (3) The present invention also improves the disease resistance of crops by adding vitamin C and vitamin E, and adds beneficial microorganisms to the crop soil by adding biological agents, thereby improving the soil structure and promoting the growth of crops. DETAILED DESCRIPTION

[0024] In modern agricultural production, crop diseases have always been a key factor affecting yield and quality. According to statistics, the annual crop loss caused by diseases in the world can reach 20%-40%. The traditional prevention and control method mainly uses chemical pesticides, but the long-term and large-scale use of chemical pesticides has brought many problems, such as pesticide residues, environmental pollution, and increased resistance of pests. In order to find a more environmentally friendly and efficient way to prevent and control diseases, disease-resistant water-soluble fertilizers came into being. For example, in vegetable cultivation, common diseases such as downy mildew of cucumbers and late blight of tomatoes occur frequently. Disease-resistant water-soluble fertilizers can provide nutrients for crops while enhancing the disease resistance of crops themselves and reducing the frequency and severity of diseases.

[0025] Compared with traditional chemical pesticides, the use of disease-resistant water-soluble fertilizers can reduce the amount of chemical pesticides applied. The large-scale use of chemical pesticides will cause environmental problems such as pesticide residues, soil pollution and water pollution. Disease-resistant water-soluble fertilizers mainly prevent and control diseases by enhancing the plant's own disease resistance, reducing the negative impact on the environment. However, the current water-soluble fertilizer products on the domestic market are mainly in the form of solid powder and liquid. Most solid powder water-soluble fertilizers have a low content of active ingredients, low plant utilization rate, and limited improvement in crop disease resistance. Based on this, it is of great practical significance to provide a disease-resistant water-soluble fertilizer with a high content of active ingredients that can improve crop disease resistance.

[0026] The present invention provides a disease-resistant water-soluble fertilizer, comprising the following components:

[0027] Potassium dihydrogen phosphate, manganese sulfate, potassium sulfate, trans-asarone, lemon essential oil, eugenol, vitamin C, vitamin E, calcium chloride, sodium chloride and biological bacteria agent.

[0028] In the present invention, the mass parts of the components are preferably: 15-25 parts of potassium dihydrogen phosphate, 10-15 parts of manganese sulfate, 10-15 parts of potassium sulfate, 8-15 parts of trans-asarone, 8-15 parts of lemon essential oil, 8-15 parts of eugenol, 5-10 parts of vitamin C, 5-10 parts of vitamin E, 3-8 parts of calcium chloride, 3-8 parts of sodium chloride and 10-15 parts of biological bacterial agent; further preferably, 15-20 parts of potassium dihydrogen phosphate, 10-12 parts of manganese sulfate, 10-12 parts of potassium sulfate, 8-10 parts of trans-asarone, 8-10 parts of lemon essential oil, 8-10 parts of eugenol, 5-8 parts of vitamin C, 5-8 parts of vitamin E, 3-5 parts of calcium chloride, 3-5 parts of sodium chloride and 10-12 parts of biological bacterial agent.

[0029] In the present invention, the biological agent is preferably one or more of actinomycetes, Bacillus subtilis and Bacillus amyloliquefaciens. When multiple biological agents are used, the present invention does not impose any special limitation on the dosage ratio, and any ratio can be adopted according to actual usage.

[0030] The present invention also provides a method for preparing the disease-resistant water-soluble fertilizer described in the above technical solution, comprising the following steps:

[0031] Dissolving potassium dihydrogen phosphate, manganese sulfate and potassium sulfate in water for a first mixing to obtain a disease-resistant water-soluble fertilizer matrix;

[0032] Adding calcium chloride and sodium chloride to the disease-resistant water-soluble fertilizer matrix and mixing them to obtain a first mixture;

[0033] Trans-asarone, lemon essential oil, eugenol, vitamin C, vitamin E and biological bacterial agent are added to the first mixture for a second mixing to obtain the disease-resistant water-soluble fertilizer.

[0034] Dissolving potassium dihydrogen phosphate, manganese sulfate and potassium sulfate in water for a first mixing to obtain a disease-resistant water-soluble fertilizer matrix;

[0035] The invention provides rich nutrient elements for crop growth by adding potassium dihydrogen phosphate, manganese sulfate and potassium sulfate. The potassium dihydrogen phosphate and potassium sulfate can regulate the physiological and biochemical processes in the plant to enhance stress resistance. The potassium dihydrogen phosphate and potassium sulfate can regulate the osmotic pressure in the plant cells, so that the cells can maintain normal turgor pressure to a certain extent, and ensure the normal operation of the physiological functions of the plants. The manganese element in the manganese sulfate can participate in the synthesis of antioxidant enzymes such as superoxide dismutase (SOD) in the plant body, help the plant to remove excessive active oxygen free radicals in the body, and reduce the damage of oxidative stress to the plant. When the plant is subjected to adverse stress, such as heavy metal pollution, high temperature, etc., the supply of manganese sulfate can enhance the antioxidant capacity of the plant and maintain the normal physiological functions of the plant cells.

[0036] In the present invention, the mass ratio of potassium dihydrogen phosphate to water in the first mixture is preferably 2-3:4-6, and more preferably 2-3:4-5.

[0037] In the present invention, the temperature of the first mixing is preferably 35 to 45° C., more preferably 35 to 40° C., and the time is preferably 40 to 60 minutes, more preferably 40 to 50 minutes.

[0038] The invention dissolves potassium dihydrogen phosphate, manganese sulfate and potassium sulfate in water, and promotes the solubility thereof by limiting the dissolution temperature, thereby increasing the effective components in the final disease-resistant water-soluble fertilizer.

[0039] Adding calcium chloride and sodium chloride to the disease-resistant water-soluble fertilizer matrix and mixing them to obtain a first mixture;

[0040] The present invention provides chlorine and calcium elements for crop growth by adding calcium chloride and sodium chloride, and can also improve the physical properties of the water-soluble fertilizer, reduce the freezing point of the water-soluble fertilizer, prevent the water-soluble fertilizer from freezing in a low-temperature environment, and facilitate the storage and transportation of the water-soluble fertilizer.

[0041] Trans-asarone, lemon essential oil, eugenol, vitamin C, vitamin E and biological bacterial agent are added to the first mixture for a second mixing to obtain the disease-resistant water-soluble fertilizer.

[0042] The invention adds trans-asarone, lemon essential oil and eugenol, wherein the trans-asarone and the lemon essential oil have certain antibacterial activity, can inhibit the growth and reproduction of some plant pathogens and pests, reduce the risk of crop infection, reduce the damage of pests to plants, and the breeding and spread of pathogens on the surface of plants, thereby indirectly promoting the growth and development of crops, and the eugenol has a strong bactericidal power, can inhibit the growth and reproduction of some harmful microorganisms that may exist in water-soluble fertilizers, prevent the water-soluble fertilizers from deteriorating and mildewing during storage and use, prolong the shelf life of the water-soluble fertilizers, and also can reduce crop diseases caused by the breeding of microorganisms; vitamin C and vitamin E are used to enhance the disease resistance of crops, and beneficial microorganisms are added to crop soil by adding biological microbial agents, so as to improve the soil structure and promote the growth of crops.

[0043] In the present invention, the second mixing temperature is preferably 25 to 30° C., more preferably 25 to 27° C., and the mixing time is preferably 20 to 30 minutes, more preferably 20 to 25 minutes.

[0044] In the present invention, the second mixing is preferably adding the obtained first mixture, trans-asarone, lemon essential oil, eugenol, vitamin C, vitamin E and biological bacterial agent into a high-speed mixer for mixing, stirring and extruding, and then granulating with a granulator and drying to form.

[0045] The present invention also provides the use of the disease-resistant water-soluble fertilizer described in the above technical solution or the disease-resistant water-soluble fertilizer obtained by the preparation method described in the above technical solution in crop prevention and control.

[0046] In the present invention, unless otherwise specified, the required raw materials for preparation are all commercially available products well known to those skilled in the art.

[0047] The technical solutions provided by the present invention are described in detail below in conjunction with the embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0048] Example 1

[0049] (1) at a temperature of 35° C., 15 parts of potassium dihydrogen phosphate, 10 parts of manganese sulfate and 10 parts of potassium sulfate were dissolved in 30 parts of water and mixed for 40 minutes, and after mixing evenly, a disease-resistant water-soluble fertilizer matrix was obtained;

[0050] (2) adding 3 parts of calcium chloride and 3 parts of sodium chloride to the disease-resistant water-soluble fertilizer matrix, stirring and mixing, and mixing evenly to obtain a first mixture;

[0051] (3) then adding 8 parts of trans-asarone, 8 parts of lemon essential oil, 8 parts of eugenol, 5 parts of vitamin C, 5 parts of vitamin E, 5 parts of actinomycetes and 5 parts of Bacillus subtilis to the first mixture at a temperature of 25° C. and mixing for 20 minutes. After mixing evenly, a mixture of disease-resistant water-soluble fertilizer is obtained;

[0052] (4) Finally, the mixture of the disease-resistant water-soluble fertilizer is added into a high-speed mixer for mixing, stirring and extrusion, and then granulated by a granulator, dried and formed to obtain the disease-resistant water-soluble fertilizer.

[0053] Example 2

[0054] (1) at a temperature of 40° C., 20 parts of potassium dihydrogen phosphate, 12 parts of manganese sulfate and 12 parts of potassium sulfate were dissolved in 40 parts of water and mixed for 50 minutes, and after mixing evenly, a disease-resistant water-soluble fertilizer matrix was obtained;

[0055] (2) adding 5 parts of calcium chloride and 5 parts of sodium chloride to the disease-resistant water-soluble fertilizer matrix, stirring and mixing, and mixing evenly to obtain a first mixture;

[0056] (3) then adding 10 parts of trans-asarone, 10 parts of lemon essential oil, 10 parts of eugenol, 8 parts of vitamin C, 8 parts of vitamin E, 6 parts of actinomycetes and 6 parts of Bacillus subtilis to the first mixture at a temperature of 27° C. and mixing for 25 minutes to obtain a mixture of disease-resistant water-soluble fertilizer after mixing evenly;

[0057] (4) Finally, the mixture of the disease-resistant water-soluble fertilizer is added into a high-speed mixer for mixing, stirring and extrusion, and then granulated by a granulator, dried and formed to obtain the disease-resistant water-soluble fertilizer.

[0058] Example 3

[0059] (1) dissolving 25 parts of potassium dihydrogen phosphate, 15 parts of manganese sulfate and 15 parts of potassium sulfate in 50 parts of water and mixing for 60 minutes at a temperature of 45° C., and mixing evenly to obtain a disease-resistant water-soluble fertilizer matrix;

[0060] (2) adding 8 parts of calcium chloride and 8 parts of sodium chloride to the disease-resistant water-soluble fertilizer matrix, stirring and mixing, and mixing evenly to obtain a first mixture;

[0061] (3) then adding 15 parts of trans-asarone, 15 parts of lemon essential oil, 15 parts of eugenol, 10 parts of vitamin C, 10 parts of vitamin E, 7 parts of Bacillus amyloliquefaciens and 8 parts of Bacillus subtilis to the first mixture at a temperature of 30° C. and mixing for 20 minutes. After mixing evenly, a mixture of disease-resistant water-soluble fertilizer was obtained;

[0062] (4) Finally, the mixture of the disease-resistant water-soluble fertilizer is added into a high-speed mixer for mixing, stirring and extrusion, and then granulated by a granulator, dried and formed to obtain the disease-resistant water-soluble fertilizer.

[0063] Application Example 1

[0064] The disease-resistant water-soluble fertilizer obtained in Example 1 was diluted 300 times with water, and the prepared fertilizer solution was applied to the farmland along with irrigation water. The fertilizer solution was evenly distributed in the soil with the help of water flow, so that the wheat root system could absorb nutrients.

[0065] Comparative application example 1

[0066] Dilute ordinary fertilizer 300 times with water, and apply the prepared fertilizer solution to the farmland along with irrigation water. Use the water flow to evenly distribute the fertilizer solution in the soil so that the wheat roots can absorb nutrients.

[0067] After the corn matures, observe and record the inhibition rate of corn pathogens and yield. The results are as follows: The yield of wheat obtained in Application Example 1 is 7056kg / hm 2 The inhibition rate of pathogens was 94%; the yield of wheat obtained in comparative example 1 was 6532kg / hm 2 , the inhibition rate of pathogens is 63%. Based on the above, the disease-resistant water-soluble fertilizer of the present invention has a higher growth-promoting effect on crops, and can make crops have a higher growth-promoting effect.

[0068] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A disease-resistant water-soluble fertilizer, characterized in that: Includes the following components: Potassium dihydrogen phosphate, manganese sulfate, potassium sulfate, trans-asarone, lemon essential oil, eugenol, vitamin C, vitamin E, calcium chloride, sodium chloride and biological bacteria agent.

2. The disease-resistant water-soluble fertilizer according to claim 1, characterized in that The components are respectively in parts by weight: 15 to 25 parts of potassium dihydrogen phosphate, 10 to 15 parts of manganese sulfate, 10 to 15 parts of potassium sulfate, 8 to 15 parts of trans-asarone, 8 to 15 parts of lemon essential oil, 8 to 15 parts of eugenol, 5 to 10 parts of vitamin C, 5 to 10 parts of vitamin E, 3 to 8 parts of calcium chloride, 3 to 8 parts of sodium chloride and 10 to 15 parts of biological bacterial agent.

3. The disease-resistant water-soluble fertilizer according to claim 1, characterized in that The biological bacterial agent is one or more of actinomycetes, Bacillus subtilis and Bacillus amyloliquefaciens.

4. A method for preparing the disease-resistant water-soluble fertilizer according to any one of claims 1 to 3, characterized in that: The following steps are involved: Dissolving potassium dihydrogen phosphate, manganese sulfate and potassium sulfate in water for a first mixing to obtain a disease-resistant water-soluble fertilizer matrix; Adding calcium chloride and sodium chloride to the disease-resistant water-soluble fertilizer matrix and mixing them to obtain a first mixture; Trans-asarone, lemon essential oil, eugenol, vitamin C, vitamin E and biological bacterial agent are added to the first mixture for a second mixing to obtain the disease-resistant water-soluble fertilizer.

5. The preparation method of disease-resistant water-soluble fertilizer according to claim 4, characterized in that, The mass ratio of potassium dihydrogen phosphate to water in the first mixture is 2-3:4-6.

6. The method for preparing the disease-resistant water-soluble fertilizer according to claim 4, characterized in that: The temperature of the first mixing is 35-45° C., and the time is 40-60 minutes.

7. The method for preparing the disease-resistant water-soluble fertilizer according to claim 4, characterized in that: The temperature of the second mixing is 25-30° C., and the time is 20-30 minutes.

8. The method for preparing the disease-resistant water-soluble fertilizer according to claim 4, characterized in that: The second mixing is to add the first mixture, trans-asarone, lemon essential oil, eugenol, vitamin C, vitamin E and biological bacterial agent into a high-speed mixer, mix, stir and extrude, and then granulate with a granulator and dry to form.

9. Use of the disease-resistant water-soluble fertilizer according to any one of claims 1 to 3 or the disease-resistant water-soluble fertilizer obtained by the preparation method according to any one of claims 4 to 8 in crop control.