Composite liquid medical fertilizer as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of pesticide fertilizers for crops, and particularly relates to a composite liquid pesticide fertilizer as well as a preparation method and application thereof. The compound liquid pesticide fertilizer integrates the dual effects of fertilizer and pesticide, and aims to improve the yield and quality of wheat through a specific formula and a specific preparation process, and effectively prevent and treat wheat stem rot at the same time. The compound liquid medical fertilizer is prepared from the following raw materials: zein, carboxymethyl chitosan, ZnNO3, KCl, MgCl2, sodium phenylacetate, tebuconazole, brassinolide and the like, and the components provide nutrients required by crops and play a role in preventing and treating diseases. The compound liquid pesticide fertilizer provided by the invention is an efficient and environment-friendly pesticide fertilizer product. The medical fertilizer not only can provide required nutrition for wheat and promote healthy growth, but also can effectively prevent and treat wheat stem rot and improve yield and quality, and has a wide application prospect.

Description

Technical Field

[0001] The invention belongs to the technical field of crop pesticide fertilizers, and in particular relates to a composite liquid pesticide fertilizer and a preparation method and application thereof. Background Art

[0002] Wheat stem rot is a disease caused by a variety of pathogens, which mainly harms the stem base of wheat. This disease can occur during the wheat growth cycle, but generally begins to show symptoms during the wheat greening period, and the disease peaks during the grain filling period. Brown spots will appear at the base of the stem of the affected wheat. As the disease progresses, the spots gradually expand and spread around the stem, eventually causing the stem to break and the plant to die. Wheat stem rot can cause dry white ears in the field, thin and even seedless grains, which has a serious impact on wheat yield and quality.

[0003] Fertilizer products are usually designed in easy-to-use dosage forms, such as granules, powders or liquids, so that farmers can flexibly apply them according to crop needs and land conditions. The fungicide components in fertilizers can help crops resist diseases and reduce losses, while the fertilizer components can provide the nutrients needed by crops, promote healthy growth of crops, and improve the stress resistance of crops. As a new type of high-efficiency compound fertilizer, liquid fertilizers are in a form that makes them easier for crops to absorb, so they can quickly take effect and meet the nutrition and disease control needs of crops. However, the active ingredients of traditional liquid fertilizer products are often limited by molecular size and solubility, which makes it easy for plants to release nutrients at uneven rates and difficult to be effectively absorbed, resulting in insufficient biological activity.

[0004] In recent years, the rapid development of nanotechnology has led to the widespread application of nanomaterials in the field of pesticide formulations, greatly promoting the sustainable development of pesticides. The development of new multifunctional nano-delivery systems has significantly improved the biological activity of active ingredients such as pesticides or fertilizers, increased their utilization rate and prolonged their effectiveness. Preparing fertilizer products into nanoparticles can give fertilizer particles a larger specific surface area, enhance the solubility and absorption rate of active ingredients, and promote plant absorption of nutrients.

[0005] Therefore, providing a bio-friendly composite liquid fertilizer is of great significance for the application of nanomaterials in pesticides. Summary of the invention

[0006] In view of this, in order to solve this problem, the purpose of the present invention is to provide a composite liquid fertilizer and a preparation method and application thereof.

[0007] It should be noted that traditional fertilization and pesticide application are two separate steps, and pesticide fertilizer realizes the two-in-one of pesticide and fertilizer. Farmers can complete the operation of fertilization and pesticide application at one time when using it, thereby reducing repetitive labor and saving time and labor costs. Composite liquid pesticide fertilizer is suitable for various application methods such as sprinkler irrigation, drip irrigation or watering. It is not only easy to use, but also can achieve the effect of killing two birds with one stone. The composite liquid pesticide fertilizer does not cool down during the dissolution and dilution process. After application, it can be evenly distributed in the soil, avoiding the problem of excessive local salt caused by concentrated fertilization of traditional solid fertilizers, thereby reducing the risk of root seedling frostbite. The composite liquid pesticide fertilizer described in the present invention can effectively improve the utilization rate of fertilizer and enable plants to better absorb nutrients. At the same time, it can also enhance the adaptability of plants, promote root growth, activate the rhizosphere state, and regulate plant growth and development.

[0008] In order to achieve the above object, the present invention adopts the following technical solution:

[0009] The first technical purpose of the present invention is to provide a composite liquid fertilizer, wherein the raw materials of the composite liquid fertilizer are measured by weight and include:

[0010] 20-30 parts of zein, 60-80 parts of anionic polysaccharides, 100-300 parts of ZnNO 3 , 100-300 parts KCl, 100-300 parts MgCl 2 , 5-10 parts of pesticide preservatives, 30-100 parts of tebuconazole, 0.1-0.5 parts of brassinolide, and 3000-5000 parts of water.

[0011] Furthermore, the composite liquid fertilizer comprises the following raw materials:

[0012] 20-30g zein, 60-80g anionic polysaccharide, 100-300g ZnNO 3 , 100~300g KCl, 100~300gMgCl 2 , 5-10g pesticide preservative, 30-100g tebuconazole, 0.1-0.5g brassinolide, 3-5L water.

[0013] Preferably, the anionic polysaccharide includes carboxymethyl chitosan and carboxymethyl cellulose, and the pesticide preservative includes sodium phenylacetate and potassium sorbate.

[0014] It should be noted that the tebuconazole with an active ingredient content of 95% is a low-toxic fungicide. Adding a small amount of tebuconazole to the liquid fertilizer can effectively prevent and control wheat stem base rot; zein can make tebuconazole better dispersed, and at the same time, it can also make the substances in the foliar fertilizer stably and evenly distributed and better dissolved in the mixed solution.

[0015] The brassinolide with an active ingredient content of 90% can promote the growth and development of wheat roots and leaves, make the root system more developed, and make the leaves thicker and darker green; it can increase the wheat's ability to absorb water and nutrients, thereby improving the yield and quality of wheat, and is an important plant growth regulator in agricultural production.

[0016] The composite liquid fertilizer of the present invention is a light yellow uniform liquid, which may slightly precipitate after being stored for a long time, but does not affect the efficacy. After being shaken well, it can be used after being diluted 300-1000 times with water.

[0017] A second technical object of the present invention is to provide a method for preparing the composite liquid fertilizer as described above, comprising the following steps:

[0018] (1) 75% ethanol solution was measured, and zein, tebuconazole and brassinolide were added, and the mixture was fully stirred to obtain a homogeneous and transparent solution A.

[0019] It should be noted that the substances in solution A that are poorly soluble in water must be fully and evenly dissolved.

[0020] (2) Take an appropriate amount of purified water, add carboxymethyl chitosan and sodium phenylacetate thereto, and stir until they are completely dissolved to obtain a homogeneous and transparent solution B.

[0021] (3) Solution B is continuously stirred at a stirring speed of 500 rpm-700 rpm and a temperature of 40-45° C., preferably at a speed of 500 rpm and a temperature of 40° C. After the temperature stabilizes, solution A is added dropwise to solution B at a rate of 1-3 mL / min to ensure sufficient mixing, thereby obtaining solution C.

[0022] (4) At a shear rate of 3000-5000 rpm, ZnNO 3 MgCl 2 and KCl aqueous solution, and stir evenly for a period of time to ensure thorough mixing.

[0023] (5) using a rotary evaporator to remove ethanol from the solution, and finally collecting the finished medicinal fertilizer product.

[0024] It should be noted that for every 1L of liquid fertilizer, the total amount of N element added is 30.22-43.50g, the amount of Zn element added is 6.88-22.91g, the amount of Mg element added is 5.10-16.98g, and the amount of K element added is 10.48-22.98g.

[0025] The third technical purpose of the present invention is to provide an application of the composite liquid fertilizer as described above in the prevention and treatment of crop diseases.

[0026] Specifically, the composite liquid fertilizer can prevent and treat wheat stem base rot.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] (1) The composite liquid fertilizer disclosed in the present invention combines the dual functions of fertilizer and medicine, and can be used as a spray to cover crop leaves, or can be used as a root irrigation to allow the active ingredients to evenly penetrate into the soil around the root system.

[0029] (2) The composite liquid fertilizer for preventing and treating wheat stem base rot of the present invention has good plant absorbability, can better meet the nutritional needs of plants during the growth period, optimize the growth state of crops, and thus achieve a significant increase in crop yields.

[0030] (3) The addition of Mg can significantly improve the photosynthesis efficiency of wheat leaves and provide sufficient energy for the healthy growth of wheat; the addition of K helps maintain the osmotic balance of wheat cells and enhances stress resistance; the addition of Zn can effectively regulate the growth rate of wheat, making the plants stronger and the root system more developed, ensuring high and stable yields of wheat.

[0031] (4) The main ingredients of the present invention, zein and carboxymethyl chitosan, can self-crosslink to form nanoparticles, which have natural film-forming properties while increasing the dispersibility of the emulsion, replacing the negative effects of adding dispersants to the environment in traditional water-soluble fertilizers, and are pollution-free to the human environment and are safe and environmentally friendly.

[0032] (5) The composite liquid fertilizer provided by the present invention can not only provide necessary nutrients for wheat and promote its healthy growth, but also effectively prevent and treat diseases such as wheat stem rot, thereby greatly reducing the losses of crops caused by diseases. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0034] Figure 1 Schematic diagram of a liquid fertilizer product of Example 1 of the present invention under a scanning electron microscope. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] The word "embodiment" used here as an "exemplary" does not necessarily mean that any embodiment described is superior to or better than other embodiments. Unless otherwise specified, the performance index tests in the embodiments of this application are performed using conventional test methods in the art. It should be understood that the terms described in this application are only used to describe specific implementation methods and are not used to limit the content disclosed in this application.

[0037] Unless otherwise specified, the technical and scientific terms used in this document have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs; other experimental methods and technical means not specifically specified in this application refer to experimental methods and technical means commonly used by ordinary technicians in this field.

[0038] In order to better illustrate the content of the present application, numerous specific details are provided in the specific examples below. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In the embodiments, some methods, means, instruments, equipment, etc. well known to those skilled in the art are not described in detail in order to highlight the main purpose of the present application.

[0039] Under the premise of no conflict, the technical features disclosed in the embodiments of the present application can be combined arbitrarily, and the resulting technical solutions belong to the contents disclosed in the embodiments of the present application.

[0040] The invention discloses a composite liquid medicinal fertilizer and a preparation method and application thereof.

[0041] In order to better understand the present invention, the present invention is further specifically described below through the following examples, but it should not be understood as limiting the present invention. Some non-essential improvements and adjustments made by technicians in this field based on the above invention content are also considered to fall within the protection scope of the present invention.

[0042] It should be noted that the raw materials in the following examples include industrial-grade zein with a content of ≥99%, carboxymethyl chitosan with a substitution degree of 40%, 95% tebuconazole technical, 90% brassinolide powder, and 99% sodium phenylacetate.

[0043] Example 1

[0044] A composite liquid fertilizer for preventing and treating wheat stem base rot comprises the following raw materials in parts by weight:

[0045] 20g zein, 80g carboxymethyl chitosan, 100g ZnNO 3 , 200g KCl, 100g MgCl 2 , 5g sodium phenylacetate, 50g tebuconazole, 0.2g brassinolide, 5L water.

[0046] A method for preparing a composite liquid fertilizer capable of inhibiting and preventing wheat stem base rot comprises the following steps:

[0047] (1) 500 g of 75% ethanol solution was measured, 20 g of zein, 50 g of tebuconazole and 0.2 g of brassinolide were added, and the mixture was fully mixed under mechanical stirring at 500 rpm. After the mixture was completely dissolved, a solution A was obtained by collecting the mixture.

[0048] (2) Take 4 L of deionized water, add 80 g of carboxymethyl chitosan and 5 g of sodium phenylacetate under mechanical stirring at 500 rpm, and continue stirring until they are completely dissolved to obtain a homogeneous and transparent solution B.

[0049] (3) Solution B was continuously stirred at a speed of 500 rpm and a temperature of 40° C. After the temperature stabilized, solution A was added dropwise to solution B using a flow pump. After cross-linking for 1 h, the solution was collected to obtain solution C.

[0050] (4) Adjust the shear speed to 3000 rpm and add 100 g ZnNO 3 、100gMgCl 2 and 200 g of KCl aqueous solution (each metal salt ion is dissolved in 300 g of water), and cut evenly for 30 minutes to ensure sufficient mixing.

[0051] (5) The mixed solution was transferred to a rotary evaporator to remove the ethanol in the solution, and the remaining solution was collected and diluted to 5 L of water to obtain a finished medicinal fertilizer product.

[0052] When using, take the above-prepared compound fertilizer solution, dilute it 1000 times with water, and spray it on the leaves of wheat in the green stage. Use a sprayer to evenly spray the fertilizer liquid on the leaves and rhizomes of the crop. When spraying, make sure that the front and back of the leaves are evenly covered with the fertilizer liquid to improve the absorption efficiency of nutrients and ensure that the active ingredients are retained on the leaves and rhizomes to the maximum extent.

[0053] Example 2

[0054] A composite liquid fertilizer for preventing and treating wheat stem base rot, comprising the following raw materials in weight fractions:

[0055] 20g zein, 80g carboxymethyl chitosan, 100g ZnNO 3 , 200g KCl, 100g MgCl2 , 5g sodium phenylacetate, 100g tebuconazole, 0.2g brassinolide, 5L water.

[0056] A method for preparing a composite liquid fertilizer for preventing and treating wheat stem base rot comprises the following steps:

[0057] (1) 500 g of 75% ethanol solution was measured, 20 g of zein, 100 g of tebuconazole and 0.2 g of brassinolide were added, and the mixture was fully mixed under mechanical stirring at 500 rpm. After the mixture was completely dissolved, a solution A was obtained.

[0058] (2) Take 4 L of deionized water, add 80 g of carboxymethyl chitosan and 5 g of sodium phenylacetate under mechanical stirring at 500 rpm, and continue stirring until they are completely dissolved to obtain a homogeneous and transparent solution B.

[0059] (3) Solution B was continuously stirred at a speed of 500 rpm and a temperature of 40° C. After the temperature stabilized, solution A was added dropwise to solution B using a flow pump. After cross-linking for 1 h, the solution was collected to obtain solution C.

[0060] (4) Adjust the shear speed to 3000 rpm and add 100 g ZnNO 3 、100gMgCl 2 and 200 g of KCl aqueous solution (each metal salt ion is dissolved in 300 g of water), and cut evenly for 30 minutes to ensure sufficient mixing.

[0061] (5) The mixed solution was transferred to a rotary evaporator to remove the ethanol in the solution, and the remaining solution was collected and diluted to 5 L of water to obtain a finished medicinal fertilizer product.

[0062] When using, take the above-prepared compound fertilizer solution, dilute it 1000 times with water, and spray it on the leaves of wheat in the green stage. Use a sprayer to evenly spray the fertilizer liquid on the leaves and rhizomes of the crop. When spraying, make sure that the front and back of the leaves are evenly covered with the fertilizer liquid to improve the absorption efficiency of nutrients and ensure that the active ingredients are retained on the leaves and rhizomes to the maximum extent.

[0063] Example 3

[0064] A composite liquid fertilizer for preventing and treating wheat stem base rot, comprising the following raw materials in weight fractions:

[0065] 30g zein, 80g carboxymethyl chitosan, 200g ZnNO 3 , 100g KCl, 100g MgCl 2 , 10g sodium phenylacetate, 100g tebuconazole, 0.2g brassinolide, 5L water.

[0066] A method for preparing a composite liquid fertilizer for preventing and treating wheat stem base rot comprises the following steps:

[0067] (1) 500 g of 75% ethanol solution was measured, 30 g of zein, 100 g of tebuconazole and 0.2 g of brassinolide were added, and the mixture was fully mixed under mechanical stirring at 500 rpm. After the mixture was completely dissolved, a solution A was obtained.

[0068] (2) Take 4 L of deionized water, add 80 g of carboxymethyl chitosan and 10 g of sodium phenylacetate under mechanical stirring at 500 rpm, and continue stirring until they are completely dissolved to obtain a homogeneous and transparent solution B.

[0069] (3) Solution B was continuously stirred at a speed of 500 rpm and a temperature of 40° C. After the temperature stabilized, solution A was added dropwise to solution B using a flow pump. After cross-linking for 1 h, the solution was collected to obtain solution C.

[0070] (4) Adjust the shear speed to 3000 rpm and add 200 g ZnNO 3 、100gMgCl 2 and 100 g of KCl aqueous solution (each metal salt ion is dissolved in 300 g of water), and cut evenly for 30 minutes to ensure sufficient mixing.

[0071] (5) The mixed solution was transferred to a rotary evaporator to remove the ethanol in the solution, and the remaining solution was collected and diluted to 5 L of water to obtain a finished medicinal fertilizer product.

[0072] When using, take the above-prepared compound fertilizer solution, dilute it 300 times with water and irrigate the roots during the greening period. When irrigating the roots, ensure that the fertilizer solution can evenly penetrate into the soil around the roots so that the roots can better absorb nutrients.

[0073] Example 4

[0074] A composite liquid fertilizer for preventing and treating wheat stem base rot, comprising the following raw materials in weight fractions:

[0075] 20g zein, 80g carboxymethyl chitosan, 200g ZnNO 3 , 300g KCl, 200g MgCl 2 , 10g sodium phenylacetate, 50g tebuconazole, 0.4g brassinolide, 4L water.

[0076] A method for preparing a composite liquid fertilizer for preventing and treating wheat stem base rot comprises the following steps:

[0077] (1) 300 g of 75% ethanol solution was measured, 20 g of zein, 50 g of tebuconazole and 0.4 g of brassinolide were added, and the mixture was fully mixed under mechanical stirring at 500 rpm. After the mixture was completely dissolved, a solution A was obtained.

[0078] (2) Take 3 L of deionized water, add 80 g of carboxymethyl chitosan and 10 g of sodium phenylacetate under mechanical stirring at 500 rpm, and continue stirring until they are completely dissolved to obtain a homogeneous and transparent solution B.

[0079] (3) Solution B was continuously stirred at a speed of 500 rpm and a temperature of 40° C. After the temperature stabilized, solution A was added dropwise to solution B using a flow pump. After cross-linking for 1 h, the solution was collected to obtain solution C.

[0080] (4) Adjust the shear speed to 3000 rpm and add 200 g ZnNO 3 、200gMgCl 2 and 300 g of KCl aqueous solution (each metal salt ion is dissolved in 300 g of water), and cut evenly for 30 minutes to ensure sufficient mixing.

[0081] (5) The mixed solution was transferred to a rotary evaporator to remove the ethanol in the solution, and the remaining solution was collected and diluted to 4 L of water to obtain a finished medicinal fertilizer product.

[0082] When using, take the above-prepared compound fertilizer solution, dilute it 300 times with water and irrigate the roots of wheat in the green stage. When irrigating the roots, ensure that the fertilizer solution can evenly penetrate into the soil around the roots so that the roots can better absorb nutrients.

[0083] Example 5

[0084] A composite liquid fertilizer for preventing and treating wheat stem base rot comprises the following raw materials in parts by weight:

[0085] 10g zein, 60g carboxymethyl chitosan, 200g ZnNO 3 , 200g KCl, 100g MgCl 2 , 5g sodium phenylacetate, 30g tebuconazole, 0.3g brassinolide, 5L water.

[0086] A method for preparing a composite liquid fertilizer capable of inhibiting and preventing wheat stem base rot comprises the following steps:

[0087] (1) 500 g of 75% ethanol solution was measured, 10 g of zein, 30 g of tebuconazole and 0.3 g of brassinolide were added, and the mixture was fully mixed under mechanical stirring at 500 rpm. After the mixture was completely dissolved, a solution A was obtained.

[0088] (2) Take 4 L of deionized water, add 60 g of carboxymethyl chitosan and 5 g of sodium phenylacetate under mechanical stirring at 500 rpm, and continue stirring until they are completely dissolved to obtain a homogeneous and transparent solution B.

[0089] (3) Solution B was continuously stirred at a speed of 500 rpm and a temperature of 40° C. After the temperature stabilized, solution A was added dropwise to solution B using a flow pump. After cross-linking for 1 h, the solution was collected to obtain solution C.

[0090] (4) Adjust the shear speed to 3000 rpm and add 200 g ZnNO 3 、100gMgCl 2 and 200 g of KCl aqueous solution (each metal salt ion is dissolved in 300 g of water), and cut evenly for 30 minutes to ensure sufficient mixing.

[0091] (5) The mixed solution was transferred to a rotary evaporator to remove the ethanol in the solution, and the remaining solution was collected and diluted to 5 L of water to obtain a finished medicinal fertilizer product.

[0092] When using, take the above-prepared compound fertilizer solution, dilute it 300 times with water and irrigate the roots of wheat in the green stage. When irrigating the roots, ensure that the fertilizer solution can evenly penetrate into the soil around the roots so that the roots can better absorb nutrients.

[0093] All experimental operations were carried out according to the following process:

[0094] The pseudograminearum fungus of wheat stem rot was cultured indoors, and the bacterial solution was evenly applied to the wheat soil that had just entered the green period. After the bacterial solution was fully absorbed, the experimental method given in each embodiment was operated, and a clear water control was set up to treat the roots by irrigation. 15 days after the application of the agent, the wheat plant height, root length, diseased plant rate and other indicators were measured and recorded.

[0095] The test results are shown in the following table:

[0096] Table 1 Disease rate, plant height and root length of wheat after compound pesticide and fertilizer treatment

[0097]

[0098] The results of Table 1 show that the diseased plant rates of Examples 1 to 5 are significantly lower than those of the clear water control group (51.11%), indicating that the drug-fertilizer treatment significantly improves the disease resistance of wheat. Among them, the diseased plant rate of Example 2 is the lowest, at 15.56%, indicating that the treatment method is most effective in preventing and treating wheat stem base rot. At the same time, the plant height of Example 2 is the highest, at 15.45 cm, indicating that the treatment method is not only effective in disease resistance, but also can promote the growth of wheat. The plant height of the clear water control group is the lowest, at 12.28 cm, indicating that when the drug-fertilizer treatment is not performed, the plant height of wheat is significantly lower than that of Example 1, Example 2, Example 4 and Example 5. The root length of Example 1, Example 2, Example 4 and Example 5 is significantly higher than that of the clear water control group, indicating that the treatment method significantly promotes the growth of wheat roots. The root length of the clear water control group is the shortest, at only 6.10 cm, which is significantly different from that of the other treatment groups, indicating that the application of nanocomposite liquid drug-fertilizer has a significant promoting effect on root growth.

[0099] In general, the nanocomposite liquid fertilizer treatment had a significant effect on the disease resistance, plant height and root length of wheat, especially Example 2, which showed the best effect in all indicators. These data show that different liquid fertilizer treatment methods have a regulatory effect on wheat growth, further proving the potential of the composite liquid fertilizer in improving crop disease resistance and promoting growth.

[0100] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A composite liquid fertilizer, characterized in that: The raw materials of the composite liquid fertilizer include, by weight: 20-30 parts of zein, 60-80 parts of anionic polysaccharides, 100-300 parts of ZnNO3, 100-300 parts of KCl, 100-300 parts of MgCl2, 5-10 parts of pesticide preservatives, 30-100 parts of tebuconazole, 0.1-0.5 parts of brassinolide, and 3000-5000 parts of water.

2. The composite liquid fertilizer according to claim 1, characterized in that: The anionic polysaccharide includes carboxymethyl chitosan and carboxymethyl cellulose, and the pesticide preservative includes sodium phenylacetate and potassium sorbate.

3. A method for preparing the composite liquid fertilizer according to claim 1, characterized in that: The preparation steps include: S1. Measure 75% ethanol solution, add zein, tebuconazole and brassinolide, and stir well to obtain a homogeneous and transparent solution A; S2, taking an appropriate amount of purified water, adding carboxymethyl chitosan and sodium phenylacetate thereto, stirring until completely dissolved, to obtain a homogeneous transparent solution B; S3, continue stirring solution B, and after the temperature stabilizes, add solution A dropwise to solution B at a rate of 1-3 mL / min to ensure sufficient mixing, to obtain solution C; S4, adding ZnNO3, MgCl2 and KCl aqueous solutions to solution C in sequence, and stirring evenly to ensure adequate mixing; S5. Use a rotary evaporator to remove ethanol from the solution, and finally collect the liquid fertilizer product.

4. The method for preparing the composite liquid fertilizer according to claim 3, characterized in that: In S1, the substances in solution A that are poorly soluble in water must be fully and evenly dissolved.

5. The preparation method of the composite liquid fertilizer according to claim 3, characterized in that: In S3, when adding solution A to solution B, the stirring speed is 500 rpm-700 rpm and the temperature is 40-45°C.

6. The method for preparing the composite liquid fertilizer according to claim 3, characterized in that: In S4, the shear rate when adding the substance is 3000 to 5000 rpm.

7. Use of the composite liquid pesticide fertilizer according to claim 1 or the composite liquid pesticide fertilizer prepared by the method according to claim 3 in preventing and controlling crop diseases.

8. The use according to claim 7, characterized in that: The composite liquid fertilizer can prevent and treat wheat stem base rot.

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