Corn seed coating agent

Abstract

The invention relates to the technical field of plant growth regulators, in particular to a corn seed coating agent. The corn seed coating agent is prepared from the following components in parts by mass: 20 to 31 parts of chitosan, 18 to 20 parts of polyethylene glycol, 12 to 16 parts of xanthan gum, 8 to 14 parts of a Chinese prickly ash extract, 8 to 14 parts of a red clover extract, 7 to 11 parts of a dried orange peel extract, 4 to 6 parts of veratrine, 4 to 6 parts of sophocarpidine, 4 to 6 parts of azadirachtin, 2 to 4 parts of fusosporin, 0.05 to 1 part of potassium fulvate, 0.5 to 4 parts of a complex microbial inoculant and 0.4 to 0.8 part of plant warning toner. Compared with the prior art, the seed coating agent provided by the invention can ensure long-term storage of seeds, is more efficient and safer than a chemical insecticide, does not cause negative effects on the environment, and does not cause harm to health of grain storage personnel.

Description

Technical Field

[0001] The invention relates to the technical field of plant growth regulators, in particular to a corn seed coating agent. Background Art

[0002] Seed coating, as an important seed processing procedure, has been widely used in seed production. Coating agent is an important seed coating treatment agent processed according to the physiological and biochemical characteristics of crop (plant) seeds and seedlings, with pesticides, fertilizers, biological agents, etc. as active ingredients and film-forming agents, etc. as inactive ingredients. Corn is one of the main food crops in my country. Selecting high-quality coating agents for coating before sowing corn ensures that all corn seedlings are grown at once, and that the seedlings are even, uniform, and strong. This is one of the most important links in achieving high yields of corn. In addition, corn is prone to a variety of diseases and pests from sowing and germination to harvesting, which has a certain impact on the yield and quality of corn. However, unsuitable coating agents often directly affect the use of seeds due to quality problems, such as being unable to effectively prevent and control pests and diseases and help seeds overcome adverse external environments; unsuitable coating agents also have disadvantages such as long film-forming time, low coating uniformity, and poor adhesion; in addition, coating agents widely used on the market generally contain pesticides, such as furadan, carbendazim, etc., which inevitably cause seed damage, especially adversely affecting the safe storage of seeds. Seeds are the carriers of plant life and are important agricultural materials. Vigorously promoting the application of seed coating technology plays a very important role in promoting the development of modern agriculture. Therefore, how to provide a corn seed coating agent to solve the technical problems in the prior art that seed coating agents have poor pest and disease protection effects, great harm to the environment, low safety, and poor adhesion, which seriously affect the germination rate and final yield of corn seeds, is a technical problem that technicians in this field urgently need to solve. Summary of the invention

[0003] The purpose of the present invention is to provide a corn seed coating agent.

[0004] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions: The present invention provides a corn seed coating agent, which is prepared from the following components in parts by weight: 20-31 parts of chitosan, 18-20 parts of polyethylene glycol, 12-16 parts of xanthan gum, 8-14 parts of Zanthoxylum bungeanum extract, 8-14 parts of red clover extract, 7-11 parts of tangerine peel extract, 4-6 parts of veratridine, 4-6 parts of matrine, 4-6 parts of azadirachtin, 2-4 parts of fusine, 0.05-1 parts of potassium humate, 0.5-4 parts of composite bacterial agent, and 0.4-0.8 parts of plant warning color powder.

[0005] Preferably, the mass ratio of Burkholderia cepacia, Bacillus atrophaeus, Bacillus amyloliquefaciens, Trichoderma acanthosporium and Bacillus subtilis in the composite bacterial agent is 4-8:6-9:3-7:1-3:2-4.

[0006] Preferably, the viable count of each strain is ≥ 1×10 8 Cfu / g.

[0007] Preferably, the preparation method of the Zanthoxylum bungeanum, red clover or tangerine peel extract is: After the pepper, red clover or tangerine peel is dried and crushed, 12 to 18 times the volume of 75% ethanol is added, ultrasonic extraction is performed for 30 to 40 minutes, and the extraction is repeated 2 to 3 times to obtain the pepper, red clover or tangerine peel extract.

[0008] The present invention also provides a method for preparing the corn seed coating agent, comprising the following steps: (1) Dissolving chitosan, xanthan gum and polyethylene glycol in water in sequence to prepare a mixed solution; (2) Add Zanthoxylum bungeanum extract, red clover extract, tangerine peel extract, veratridine, matrine, azadirachtin, fusone, potassium humate, composite bacterial agent and plant warning color powder into the mixed solution, and stir evenly to prepare a corn seed coating agent.

[0009] Preferably, in step (1), the mass volume ratio of chitosan, polyethylene glycol, xanthan gum and water is 2-6 g:2-6 g:1-3 g:100 mL.

[0010] Preferably, the stirring temperature in step (2) is 35-45°C.

[0011] Preferably, when using the corn seed coating agent in step (2), the coating agent and corn seeds are evenly mixed until the surface of each seed is coated with the coating agent, and finally baked at a temperature of 30-35° C. for 9-12 hours.

[0012] Preferably, the mass ratio of the coating agent to the corn seeds is 1:120-280.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The corn seed coating agent described in the present application contains a composite bacterial agent, among which Burkholderia cepacia, Bacillus atrophaeus, Bacillus amyloliquefaciens, Trichoderma acanthosporium and Bacillus subtilis can induce corn to produce a variety of resistance substances after compounding, thereby effectively inhibiting the infection of corn by various pathogens such as corn leaf blight and stem rot, and can also significantly improve soil structure, increase soil nutrients, improve the utilization rate of other nutrients in the coating agent and the vitality and stress resistance of corn roots, thereby significantly improving the germination rate of corn seeds and the growth rate of seedlings, enhancing the disease and pest resistance of corn, and improving the soil environment, thereby improving the yield and quality of corn.

[0014] The corn seed coating agent of the present invention also includes a variety of plant-derived insecticides, among which veratridine has contact killing, stomach poisoning and growth inhibition effects, and can effectively prevent and control piercing-sucking pests and lepidopteran pests on various crops; matrine can interfere with the nervous system of insects, causing their muscles to contract non-functionally and die; azadirachtin has multiple effects on insects, such as repelling feeding, repelling, growth regulation, and sterilization; after the above three insecticides are mixed, they not only have high efficiency and broad spectrum, but also can effectively overcome the drug resistance of pests and improve the insecticidal and insect-resistant effects; in addition, pepper extract and tangerine peel extract The extracts of red clover and red clover are rich in volatile oils, flavonoids and other active substances, which not only have good insecticidal effects, but also have certain lethal effects and repellency to stored pests. In addition, with the extension of storage time, the content of active ingredients (such as total flavonoids and hesperidin) in the above extracts can also increase accordingly, thereby killing pests more effectively and ensuring long-term storage of seeds. The above plant-derived insecticidal ingredients described in the present invention are not only more efficient and safer than chemical pesticides, but also will not have a negative impact on the environment and will not harm the health of grain storage personnel.

[0015] Chitosan is used as a film-forming agent in the corn seed coating agent of the present invention. It is not only non-toxic and has good adhesion, but also has a porous structure that can control the slow release of active ingredients, so that the coating agent can exert its medicinal effect for a long time; the addition of xanthan gum can increase the viscosity of the corn seed coating agent, so that the coating agent is easy to adhere to the surface of the seed. The addition of polyethylene glycol can reduce the surface tension between water, the film-forming agent and the xanthan gum, so that various liquids are evenly dispersed. In addition, the addition of fusobacterium spores (Fc) can not only improve the germination rate and emergence rate of seeds in the field, but also is compatible with other ingredients without antagonism and can form a uniform film. Potassium humate can not only be used as a carrier component for microorganisms and enzymes to exert biological activity, but also is rich in active ingredients such as active enzymes, fulvic acid, free peptides, vitamins, amino acids and growth stimulating factors. These ingredients can provide necessary nutrition and environmental conditions for microorganisms to promote their growth and reproduction. Therefore, in combination with the above multiple ingredients, it can be ensured that the microbial active ingredients in the corn seed coating agent of the present invention can continuously and stably exert insecticidal effects, thereby extending the residual effect period of the microbial active ingredients and increasing crop yields. DETAILED DESCRIPTION

[0016] The present invention provides a corn seed coating agent, which is preferably prepared from the following components in parts by weight: 20-31 parts of chitosan, 18-20 parts of polyethylene glycol, 12-16 parts of xanthan gum, 8-14 parts of Zanthoxylum bungeanum extract, 8-14 parts of red clover extract, 7-11 parts of tangerine peel extract, 4-6 parts of veratridine, 4-6 parts of matrine, 4-6 parts of azadirachtin, 2-4 parts of fusine, 0.05-1 parts of potassium humate, 0.5-4 parts of composite bacterial agent, and 0.4-0.8 parts of plant warning color powder.

[0017] Further preferably, it is prepared from the following components in parts by weight: 22-29 parts of chitosan, 19 parts of polyethylene glycol, 13-15 parts of xanthan gum, 9-13 parts of Zanthoxylum bungeanum extract, 9-13 parts of red clover extract, 8-10 parts of tangerine peel extract, 5 parts of veratridine, 5 parts of matrine, 5 parts of azadirachtin, 3 parts of fusonidin, 0.06-0.09 parts of potassium humate, 0.6-3.5 parts of composite bacterial agent, and 0.5-0.7 parts of plant warning color powder.

[0018] Most preferably, it is prepared from the following components in parts by weight: 27 parts of chitosan, 19 parts of polyethylene glycol, 14 parts of xanthan gum, 11 parts of Zanthoxylum bungeanum extract, 12 parts of red clover extract, 9 parts of tangerine peel extract, 5 parts of veratridine, 5 parts of matrine, 5 parts of azadirachtin, 3 parts of fusine, 0.08 parts of potassium humate, 2 parts of composite bacterial agent, and 0.6 parts of plant warning color powder.

[0019] In the present invention, the mass ratio of Burkholderia cepacia, Bacillus atrophaeus, Bacillus amyloliquefaciens, Trichoderma acanthosporium and Bacillus subtilis in the composite bacterial agent is preferably 4-8:6-9:3-7:1-3:2-4, more preferably 5-7:7-9:4-6:2:3, and most preferably 6:8:5:2:3.

[0020] In the present invention, the viable count of each strain is preferably ≥ 1×10 8 Cfu / g, more preferably 1×10 8 Cfu / g~8×10 8 Cfu / g, the most preferred is 5×10 8 Cfu / g.

[0021] In the present invention, the preparation method of the Zanthoxylum bungeanum, red clover or tangerine peel extract is preferably: After drying and crushing the Zanthoxylum bungeanum, red clover or tangerine peel, add 12 to 18 times the volume of 75% ethanol, ultrasonically extract for 30 to 40 minutes, and repeat the extraction 2 to 3 times to obtain the Zanthoxylum bungeanum, red clover or tangerine peel extract. It is further preferred to add 13 to 17 times the volume of 75% ethanol, ultrasonically extract for 32 to 38 minutes, and repeat the extraction 3 times. It is most preferred to add 15 times the volume of 75% ethanol, ultrasonically extract for 35 minutes, and repeat the extraction 3 times.

[0022] The present invention also provides a method for preparing the corn seed coating agent, comprising the following steps: (1) Dissolving chitosan, xanthan gum and polyethylene glycol in water in sequence to prepare a mixed solution; (2) Add Zanthoxylum bungeanum extract, red clover extract, tangerine peel extract, veratridine, matrine, azadirachtin, fusone, potassium humate, composite bacterial agent and plant warning color powder into the mixed solution, and stir evenly to prepare a corn seed coating agent.

[0023] In the present invention, the mass volume ratio of chitosan, polyethylene glycol, xanthan gum and water in step (1) is preferably 2-6 g:2-6 g:1-3 g:100 mL, more preferably 3-5 g:3-5 g:2 g:100 mL, and most preferably 4 g:4 g:2 g:100 mL.

[0024] In the present invention, the stirring temperature in step (2) is preferably 35-45°C, more preferably 38-42°C, and most preferably 40°C.

[0025] In the present invention, the corn seed coating agent in step (2) is used by uniformly mixing the coating agent with the corn seeds until the surface of each seed is coated with the coating agent, and finally drying at a temperature of 30-35°C for 9-12 hours. The further preferred drying temperature is 31-34°C, the drying time is 10-11 hours, and the most preferred drying temperature is 32°C, and the drying time is 10 hours.

[0026] In the present invention, the mass ratio of the coating agent to the corn seeds is preferably 1:120-280, more preferably 1:130-260, and most preferably 1:220.

[0027] The technical solutions provided by the present invention are described in detail below in conjunction with the examples, but they should not be construed as limiting the scope of protection of the present invention. The strains used in Examples 1 to 3 of the present invention were all commercially available. Example 1

[0028] The present invention provides a corn seed coating agent, which is prepared from the following components in parts by weight: 20 parts of chitosan, 18 parts of polyethylene glycol, 12 parts of xanthan gum, 8 parts of Zanthoxylum bungeanum extract, 8 parts of red clover extract, 7 parts of tangerine peel extract, 4 parts of veratridine, 4 parts of matrine, 4 parts of azadirachtin, 2 parts of fusine, 0.05 parts of potassium humate, 0.5 parts of composite bacterial agent, and 0.4 parts of alkaline scarlet.

[0029] The mass ratio of Burkholderia cepacia, Bacillus atrophaeus, Bacillus amyloliquefaciens, Trichoderma acanthosporium and Bacillus subtilis in the composite bacterial agent is 4:6:3:1:2.

[0030] The viable count of each strain was 1×10 8 Cfu / g.

[0031] The preparation method of the Zanthoxylum bungeanum, red clover or tangerine peel extract is as follows: After the pepper, red clover or tangerine peel are dried and crushed, 12 times the volume of 75% ethanol is added, and ultrasonic extraction is performed for 30 minutes. The extraction is repeated twice to obtain the pepper, red clover or tangerine peel extract.

[0032] The present invention also provides a method for preparing the corn seed coating agent, comprising the following steps: (1) Dissolving chitosan, xanthan gum and polyethylene glycol in water in sequence to prepare a mixed solution; (2) Add Zanthoxylum bungeanum extract, red clover extract, tangerine peel extract, veratrine, matrine, azadirachtin, fusin, potassium humate, composite bacterial agent and alkaline red to the mixed solution, and stir evenly to prepare a corn seed coating agent.

[0033] The mass volume ratio of chitosan, polyethylene glycol, xanthan gum and water in step (1) is 2g:2g:1g:100mL.

[0034] The stirring temperature in step (2) is 35°C.

[0035] When using the corn seed coating agent in step (2), the coating agent and corn seeds are evenly mixed until the surface of each seed is coated with the coating agent, and finally baked at 30° C. for 9 hours; the mass ratio of the coating agent to the corn seeds is 1:120. Example 2

[0036] The present invention provides a corn seed coating agent, which is prepared from the following components in parts by weight: 31 parts of chitosan, 20 parts of polyethylene glycol, 16 parts of xanthan gum, 14 parts of Zanthoxylum bungeanum extract, 14 parts of red clover extract, 11 parts of tangerine peel extract, 6 parts of veratrine, 6 parts of matrine, 6 parts of azadirachtin, 4 parts of fusine, 1 part of potassium humate, 4 parts of composite bacterial agent, and 0.8 part of alkaline scarlet.

[0037] The mass ratio of Burkholderia cepacia, Bacillus atrophaeus, Bacillus amyloliquefaciens, Trichoderma acanthosporium and Bacillus subtilis in the composite bacterial agent is 8:9:7:3:4.

[0038] The viable count of each strain was 8×10 8 Cfu / g.

[0039] The preparation method of the Zanthoxylum bungeanum, red clover or tangerine peel extract is as follows: After the pepper, red clover or tangerine peel are dried and crushed, 18 times the volume of 75% ethanol is added, ultrasonic extraction is performed for 40 minutes, and the extraction is repeated 3 times to obtain the pepper, red clover or tangerine peel extract.

[0040] The present invention also provides a method for preparing the corn seed coating agent, comprising the following steps: (1) Dissolving chitosan, xanthan gum and polyethylene glycol in water in sequence to prepare a mixed solution; (2) Add Zanthoxylum bungeanum extract, red clover extract, tangerine peel extract, veratrine, matrine, azadirachtin, fusin, potassium humate, composite bacterial agent and alkaline red to the mixed solution, and stir evenly to prepare a corn seed coating agent.

[0041] The mass volume ratio of chitosan, polyethylene glycol, xanthan gum and water in step (1) is 6g:6g:3g:100mL.

[0042] The stirring temperature in step (2) is 45°C.

[0043] When using the corn seed coating agent in step (2), the coating agent and corn seeds are evenly mixed until the surface of each seed is coated with the coating agent, and finally baked at 35° C. for 12 hours; the mass ratio of the coating agent to the corn seeds is 1:280. Example 3

[0044] The present invention provides a corn seed coating agent, which is prepared from the following components in parts by weight: 27 parts of chitosan, 19 parts of polyethylene glycol, 14 parts of xanthan gum, 11 parts of Zanthoxylum bungeanum extract, 12 parts of red clover extract, 9 parts of tangerine peel extract, 5 parts of veratridine, 5 parts of matrine, 5 parts of azadirachtin, 3 parts of fusine, 0.08 parts of potassium humate, 2 parts of composite bacterial agent, and 0.6 parts of alkaline scarlet.

[0045] The mass ratio of Burkholderia cepacia, Bacillus atrophaeus, Bacillus amyloliquefaciens, Trichoderma acanthosporium and Bacillus subtilis in the composite bacterial agent is 6:8:5:2:3.

[0046] The viable count of each strain was 5×10 8 Cfu / g.

[0047] The preparation method of the Zanthoxylum bungeanum, red clover or tangerine peel extract is as follows: After the pepper, red clover or tangerine peel is dried and crushed, 15 times the volume of 75% ethanol is added, ultrasonic extraction is performed for 35 minutes, and the extraction is repeated 3 times to obtain the pepper, red clover or tangerine peel extract.

[0048] The present invention also provides a method for preparing the corn seed coating agent, comprising the following steps: (1) Dissolving chitosan, xanthan gum and polyethylene glycol in water in sequence to prepare a mixed solution; (2) Add Zanthoxylum bungeanum extract, red clover extract, tangerine peel extract, veratrine, matrine, azadirachtin, fusin, potassium humate, composite bacterial agent and alkaline red to the mixed solution, and stir evenly to prepare a corn seed coating agent.

[0049] The mass volume ratio of chitosan, polyethylene glycol, xanthan gum and water in step (1) is 4g:4g:2g:100mL.

[0050] The stirring temperature in step (2) is 40°C.

[0051] When using the corn seed coating agent in step (2), the coating agent and corn seeds are evenly mixed until the surface of each seed is coated with the coating agent, and finally baked at 32° C. for 10 hours; the mass ratio of the coating agent to the corn seeds is 1:220. Experimental Example 1

[0052] An experimental plot was selected to plant corn. The corn variety selected was Zhengdan 958. The experimental plots were divided and three plots were randomly treated in each experimental group.

[0053] Among them, the cultivation method of Example 3 was used as the experimental group; Control group 1, other methods are the same as Example 3, the only difference is that the coating agent prepared in Example 3 is replaced by a coating agent in the prior art (brand: Haishu; Changzhou Haishu New Material Technology Co., Ltd., the use method is in accordance with the instructions).

[0054] Control group 2: other methods are the same as those in Example 3, except that the composite bacterial agent in the coating agent is replaced with an equal amount of distilled water.

[0055] Control group 3: other methods are the same as those of Example 3, except that veratridine, matrine and azadirachtin are replaced by an equal amount of distilled water.

[0056] Except for the use of corn seed coating agents or plant growth regulators, the other growth management methods were the same in each test group. When the corn grew to the tasseling stage, each group sprayed 1×106 cfu / mL corn leaf blight conidia suspension, spray 5mL on each leaf surface, keep moist and culture for 24h, and manage water and fertilizer normally. Seven days after inoculation, the corn leaf blight disease index of different treatments was investigated, and the results were averaged, as shown in Table 1.

[0057] Ten corn plants of similar growth were selected from each group and inoculated with a spore suspension of Fusarium graminearum (1×10 6 cfu / mL, 5 mL was injected into each plant). The incidence of stem base rot was investigated during the peak period of stem base rot, and the results were averaged, as shown in Table 1.

[0058] After the corn was harvested, the corn yield of each plot was counted and the results were averaged, as shown in Table 2.

[0059] Corn leaf spot disease classification standard: Grade 0: no disease; Level 1: There are no lesions on the leaves or there are only sporadic lesions on the leaves below the ear, and the lesions occupy less than or equal to 5% of the leaf area; Level 3: There are a small number of lesions on the leaves below the ear, accounting for 6%-10% of the leaf area, and there are sporadic lesions on the leaves above the ear; Level 5: There are many lesions on the leaves below the ear, accounting for 11%-30% of the leaf area, and there are a few lesions on the leaves above the ear; Level 7: There are a large number of lesions on the leaves below the ear or on the leaves above the ear. The lesions are connected and occupy 31%-70% of the leaf area. Level 9: The leaves of the entire plant are basically covered with lesions and the leaves are dead.

[0060] The survey and grading standards for the disease index of stem base rot are as follows: Level 0: the plant grows normally; Level 1: the diseased plant withers from the bottom to the top, accounting for less than 1 / 4 of the leaves of the whole plant, and there are no symptoms in the 1st to 2nd nodes at the base of the stem; Level 3: the withered leaves account for about 1 / 2, and the 1st to 2nd nodes at the base of the stem are slightly water-soaked; Level 5: the withered leaves account for more than 2 / 3, the base of the stem becomes soft, and the fruit clusters begin to droop; Level 7: the leaves of the whole plant wither or die, the base of the stem becomes soft and turns brown, and the fruit clusters droop and fall over.

[0061] Disease index = ∑ (number of diseased leaves (plants) at each level × representative value at each level) / (total number of leaves (plants) surveyed × highest representative value) × 100; Table 1 Corn disease index questionnaire

[0062] As shown in Table 1, the coating agent provided by the present invention has excellent prevention and treatment effect on corn leaf spot. From the data of the control group, it can be seen that the use of the coating agent should be appropriate, otherwise the incidence of corn leaf spot will increase significantly, and only by using the complete coating agent formula of the present invention can the technical effect of effectively preventing and treating corn leaf spot be achieved.

[0063] Table 2 Corn yield

[0064] It can be seen from the contents recorded in Table 2 that the method of the present invention can significantly increase the yield of corn, and it also has the effect of preventing and controlling plant diseases, and can significantly increase the income of farmers who grow corn.

[0065] 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 corn seed coating agent, characterized in that: It is prepared from the following components in parts by weight: 20-31 parts of chitosan, 18-20 parts of polyethylene glycol, 12-16 parts of xanthan gum, 8-14 parts of Zanthoxylum bungeanum extract, 8-14 parts of red clover extract, 7-11 parts of tangerine peel extract, 4-6 parts of veratridine, 4-6 parts of matrine, 4-6 parts of azadirachtin, 2-4 parts of fusine, 0.05-1 parts of potassium humate, 0.5-4 parts of composite bacterial agent, and 0.4-0.8 parts of plant warning color powder.

2. The corn seed coating agent according to claim 1, characterized in that The mass ratio of Burkholderia cepacia, Bacillus atrophaeus, Bacillus amyloliquefaciens, Trichoderma acanthosporium and Bacillus subtilis in the composite bacterial agent is 4-8:6-9:3-7:1-3:2-4.

3. The corn seed coating agent according to claim 2, characterized in that: The viable count of each strain was ≥1×10 8 Cfu / g.

4. The corn seed coating agent according to claim 1, characterized in that The preparation method of the Zanthoxylum bungeanum, red clover or tangerine peel extract is as follows: After the pepper, red clover or tangerine peel is dried and crushed, 12 to 18 times the volume of 75% ethanol is added, ultrasonic extraction is performed for 30 to 40 minutes, and the extraction is repeated 2 to 3 times to obtain the pepper, red clover or tangerine peel extract.

5. A method for preparing the corn seed coating agent according to any one of claims 1 to 4, characterized in that: The following steps are involved: (1) Dissolving chitosan, xanthan gum and polyethylene glycol in water in sequence to prepare a mixed solution; (2) Add Zanthoxylum bungeanum extract, red clover extract, tangerine peel extract, veratridine, matrine, azadirachtin, fusone, potassium humate, composite bacterial agent and plant warning color powder into the mixed solution, and stir evenly to prepare a corn seed coating agent.

6. The preparation method according to claim 5, characterized in that: The mass volume ratio of the chitosan, polyethylene glycol, xanthan gum and water in step (1) is 2~6g:2~6g:1~3g:100mL.

7. The preparation method according to claim 5, characterized in that: The stirring temperature in step (2) is 35-45°C.

8. The preparation method according to claim 5, characterized in that: When using the corn seed coating agent in step (2), the coating agent and corn seeds are evenly mixed until the surface of each seed is coated with the coating agent, and finally baked at a temperature of 30-35° C. for 9-12 hours.

9. The preparation method according to claim 8, characterized in that: The mass ratio of the coating agent to the corn seeds is 1:120-280.

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