Biological organic foliar fertilizer as well as preparation method and application thereof

Abstract

The invention discloses a biological organic leaf fertilizer as well as a preparation method and application thereof, and belongs to the technical field of agricultural planting. Comprising the following raw materials in parts by weight: 40-55 parts of soybean protein fermentation liquor, 8-12 parts of nano silicon dioxide aerogel, 10-15 parts of bacillus subtilis, 13-20 parts of an algal polysaccharide extract, 6-9 parts of fulvic acid, 3-8 parts of trace elements, 3-5 parts of a chitosan derivative and 0.1-2 parts of a film-forming agent. The components in the foliar fertilizer provided by the invention have a synergistic effect, so that the foliar fertilizer not only can effectively provide comprehensive nutrition for soybeans and promote growth and development of the soybeans, but also can enhance the stress resistance of the soybeans, especially has outstanding performance in the aspect of relieving waterlogging damage, and is beneficial to improving the yield and quality of the soybeans. The preparation method provided by the invention is simple and easy for large-scale production, and has remarkable economic benefits.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of agricultural planting, and particularly relates to a biological organic leaf fertilizer as well as a preparation method and application thereof. BACKGROUND

[0002] As a global important oil crop, the yield stability of soybean is significantly affected by environmental stress, among which waterlogging is a key abiotic stress factor restricting soybean production. The damage of waterlogging to soybean presents multi-stage and systemic characteristics: when encountering waterlogging at the seedling stage to the grain filling stage, the oxygen content in the soil decreases rapidly, and the root tips turn brown and rot due to the production of toxins such as ethanol and lactic acid by anaerobic respiration of the roots, and the nitrogen fixation ability of rhizobium decreases, resulting in reduced nitrogen uptake by the plant; although adventitious roots can be formed in the waterlogged layer at the base of the stem to replace the function of old roots, the nutrient transport efficiency of the adventitious roots is only 40%-60% of that of normal roots, which cannot meet the high nutrient demand of the flowering and podding stage. The aboveground part shows leaf wilting, yellowing, and shedding, and the photosynthetic efficiency decreases, ultimately leading to a decrease in the number of pods and the weight of 100 seeds. In addition, waterlogging environment also induces excessive synthesis of ethylene, accelerates leaf senescence, and induces proliferation of pathogenic fungi such as root rot and rust, forming a "waterlogging-disease" combined stress.

[0003] At present, the traditional waterlogging relief measures have limitations, and although the construction of farmland water conservancy can reduce the groundwater level, the drainage efficiency is insufficient under extreme weather conditions; although short-term supplementation of nitrate nitrogen fertilizer can alleviate nitrogen starvation, it is easy to be lost with runoff, causing secondary pollution; although chemical regulators such as cytokinin analogs can delay leaf senescence, they need to be applied at the right time, and the problem of root activity recovery has not been solved; and the existing fertilizer products mainly focus on the supply of conventional nutrients, and lack of a coordinated solution to the problems of root repair, toxin degradation, and disease resistance under waterlogging stress.

[0004] Therefore, how to provide a soybean special fertilizer with the functions of root detoxification, nutrient slow release, and disease resistance induction is a technical problem that needs to be solved by those skilled in the art. SUMMARY

[0005] To solve the above technical problems, the present application provides a biological organic leaf fertilizer as well as a preparation method and application thereof.

[0006] To achieve the above-mentioned purposes, the present application provides the following technical solutions:

[0007] A biological organic leaf fertilizer, comprising the following raw materials in parts by weight:

[0008] 40-55 parts of soybean protein fermentation liquor, 8-12 parts of nano-silicon dioxide aerogel, 10-15 parts of bacillus subtilis, 13-20 parts of algal polysaccharide extract, 6-9 parts of fulvic acid, 3-8 parts of trace elements, 3-5 parts of chitosan derivatives, and 0.1-2 parts of film-forming agent.

[0009] Beneficial effects: The foliar fertilizer provided by the application is prepared by scientifically proportioning soybean protein fermentation liquor, nano silicon dioxide aerogel, bacillus subtilis and other components. The components have synergistic effect. The foliar fertilizer can not only effectively provide comprehensive nutrition for soybeans and promote the growth and development of soybeans, but also enhance the stress resistance of soybeans, especially in relieving waterlogging damage, which is helpful to improve the yield and quality of soybeans. The soybean protein fermentation liquor is rich in various amino acids, small molecule peptides and active substances, which can provide rich nutrient sources for crops and promote the growth of crops. The nano silicon dioxide aerogel has high specific surface area and excellent adsorption performance, can adsorb and carry other nutrients, enhance the adhesion and absorption of nutrients on the leaf surface, and improve the microenvironment of the leaf surface. The bacillus subtilis can produce various beneficial metabolites, regulate the soil microbial community structure, enhance the stress resistance of crops, and create a healthier growth environment for crops in cooperation with the soybean protein fermentation liquor. The alginate polysaccharide extract contains various plant growth regulators, can stimulate cell division and elongation of crops, and regulate the physiological metabolism process of crops in cooperation with fulvic acid, thereby enhancing the absorption and utilization efficiency of crops to nutrients. The trace elements exist in a stable form and are easy to be absorbed by crops, which can supplement the trace elements required for the growth of crops and meet the comprehensive nutritional needs of crops in cooperation with other raw materials. The chitosan derivative has the effects of antibiosis and inducing plant resistance, thereby enhancing the disease resistance of crops. The film forming agent forms a protective film on the leaf surface, reduces nutrient loss, prolongs the nutrient supply time, and cooperates with other raw materials to synergistically act on the aspects of nutrient supply, stress resistance enhancement, nutrient absorption and utilization, thereby comprehensively improving the growth quality and stress resistance of crops.

[0010] Preferably, the preparation method of the soybean protein fermentation liquor comprises the following steps: cooking soybeans, adding water to prepare a homogenate, mixing the homogenate with a compound fermentation bacteria, and then performing aerobic fermentation. After the aerobic fermentation is completed, filtration is performed to obtain the soybean protein fermentation liquor.

[0011] Preferably, the inoculation density of the compound fermentation bacteria is 10 6 -10 8 CFU / mL.

[0012] Preferably, the compound fermentation bacteria is a mixture of bacillus subtilis and yeast in a mass ratio of (2-4):1.

[0013] Preferably, the temperature of the aerobic fermentation is 30-42℃, and the time is 12-48h.

[0014] Beneficial effects: the soybean protein fermentation liquor obtained by the above specific preparation method is rich in various active substances such as amino acids, small molecule peptides and vitamins. The composite fermentation bacteria (Bacillus subtilis and yeast mixed in a specific ratio) with specific inoculation density can fully decompose the protein and other components in soybeans under suitable aerobic fermentation temperature and time conditions, so that the nutrient components in the fermentation liquor are more easily absorbed and utilized by soybeans, further improving the nutritional value and fertilizer efficiency of the leaf fertilizer and providing more sufficient nutrient support for the growth of soybeans.

[0015] Preferably, the trace elements include one or more of amino acid chelated zinc, EDTA-Ca, sugar alcohol zinc, ammonium molybdate, amino acid chelated iron, EDTA-Mn and B-mannitol.

[0016] More preferably, the trace elements are amino acid chelated iron, EDTA-Ca, sugar alcohol zinc and ammonium molybdate mixed in a mass ratio of 0.6:0.5:0.1:0.02.

[0017] Beneficial effects: the above trace elements can exist in a more stable and more easily absorbed form by plants. Amino acid chelated iron can effectively prevent and correct soybean iron deficiency chlorosis and promote chlorophyll synthesis; EDTA-Ca can enhance the stability of cell walls and improve the lodging resistance of soybeans; sugar alcohol zinc helps to improve the photosynthetic efficiency of soybeans; ammonium molybdate has an important promoting effect on the nitrogen fixation of soybeans. The synergistic effect of various trace elements fully meets the needs of soybeans for trace elements at different growth stages, and enhances the physiological functions and stress resistance of soybeans.

[0018] Preferably, the film-forming agent includes one or more of low molecular weight chitosan, sodium alginate, carboxymethyl cellulose sodium and starch derivatives.

[0019] More preferably, the film-forming agent includes carboxymethyl cellulose sodium and / or sodium alginate, and more preferably carboxymethyl cellulose sodium.

[0020] Beneficial effects: carboxymethyl cellulose sodium has good film-forming property, adhesion and stability, and can be synergized with nano-silicon dioxide aerogel to improve the wear resistance of the film layer, form a dense and durable film structure on the leaf surface, and effectively protect the nutrients.

[0021] Sodium alginate has a large number of carboxyl groups (-COOH) in its molecular structure, and these carboxyl groups have negative charges, which can repel each other in the solution, making the sodium alginate molecules fully stretched. In the present application, sodium alginate interacts with active ingredients in the seaweed polysaccharide extract to form a more stable active complex. This complex not only protects the active substances in the seaweed polysaccharide extract from damage by external environment (such as light, oxidation, etc.), prolongs its action time, but also enhances the adhesion of these active substances on the leaf surface, so that they can more persistently play the role of promoting growth and regulating metabolism.

[0022] More preferably, the low molecular weight chitosan has a molecular weight of 10000-50000.

[0023] Beneficial effects: The low molecular weight chitosan in this molecular weight range has good solubility and biological activity, is easy to disperse in solution, and can be better mixed with other raw materials; at the same time, it can produce a certain synergistic effect with chitosan derivatives in this range, quickly forming a film structure on the leaf surface, and the film has moderate flexibility and adhesion, which can effectively protect nutrients and will not cause damage to the leaf, and improve the overall performance of the foliar fertilizer.

[0024] More preferably, the nano-silica aerogel is a hydrophilic nano-silica aerogel with an average particle size of ≤50μm.

[0025] Beneficial effects: Under this condition, the nano-silica aerogel has a large specific surface area and excellent adsorption performance, can quickly adsorb moisture and nutrients in the surrounding environment, and slowly release them to the soybean plants, playing a role in water and fertilizer conservation. In the case of drought or uneven water supply, it can provide a relatively stable water and nutrient environment for soybeans and enhance the drought resistance of soybeans. At the same time, its nano structure helps to improve the physical properties of the soil, increase the air permeability and water retention of the soil, and create more favorable conditions for the growth of soybean roots.

[0026] A preparation method of a biological organic foliar fertilizer, comprising the following steps:

[0027] After mixing the raw materials, dissolve them in 500-800 times the mass of water to obtain the biological organic foliar fertilizer.

[0028] Beneficial effects: The preparation method provided by the present application is simple and easy to mass-produce, and the dilution ratio of 500-800 times can ensure that the concentration of effective ingredients in the foliar fertilizer is appropriate for soybean leaf absorption and utilization, and can also reduce the use cost and improve the economic benefit.

[0029] Application of a biological organic foliar fertilizer in relieving soybean waterlogging damage.

[0030] Preferably, the application period of the biological organic foliar fertilizer includes a rainfall warning period and a post-flooding repair period.

[0031] The application amount in the rainfall warning period is 15-25L / acre.

[0032] The application amount in the post-flooding repair period is 20-30L / acre.

[0033] Beneficial effects: the biological organic foliar fertilizer can effectively alleviate the soybean waterlogging damage when it is applied in the rainfall warning period and the post-flood repair period. In the rainfall warning period, the application can enhance the stress resistance of soybean in advance, so that the soybean can better adapt to the waterlogging environment and reduce the physiological obstacles caused by waterlogging. In the post-flood repair period, the application can rapidly supply nutrients to the soybean after waterlogging, repair the damaged root system and leaf tissue, and promote the recovery of soybean growth. Moreover, the suitable application amount in the application can ensure the best effect of the foliar fertilizer, and will not cause waste or adverse effects on soybean due to overuse.

[0034] More preferably, the rainfall warning period is 48 hours after the meteorological forecast shows that there will be continuous rainfall.

[0035] The post-flood repair period is after the field is treated by drainage after the rainfall ends.

[0036] The post-flood repair period is sprayed twice, the first time is in the post-flood repair period, which can accelerate the recovery of root function; the second time is within 3-5 days after the first spraying, which can continuously provide nutrient support for soybean and promote the growth of the aboveground part, so that the soybean can recover to the normal growth state as soon as possible and reduce the loss caused by waterlogging.

[0037] Compared with the prior art, the application has the following advantages and technical effects:

[0038] The components in the foliar fertilizer provided by the application have a synergistic effect, which not only can effectively provide comprehensive nutrition for soybean and promote its growth and development, but also can enhance the stress resistance of soybean, especially in alleviating waterlogging, which is helpful to improve the yield and quality of soybean. The preparation method provided by the application is simple and easy to mass produce, and has significant economic benefits. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the application will be described below in a clear and complete manner. Obviously, the described embodiments are only a part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the application.

[0040] In order to make the above-mentioned purposes, features and advantages of the application more obvious and easy to understand, the application will be further described in detail below with specific embodiments.

[0041] Unless otherwise specified, the raw materials in the embodiments of the application are obtained by market purchase;

[0042] Among them, the yeast and bacillus subtilis are purchased from Jinan Luoya Biological Technology Co., Ltd.

[0043] The nano-silica aerogel is purchased from Langfang Shangchenyi Energy Saving Technology Co., Ltd. and is a hydrophilic nano-silica aerogel.

[0044] The fucoidan extract is purchased from Xi'an Xinlu Biological Technology Co., Ltd.

[0045] The chitosan derivative is purchased from Hubei Xinyu Hong Biological Medicine Technology Co., Ltd.

[0046] The low-molecular-weight chitosan has a molecular weight of 10,000-50,000.

[0047] Unless otherwise specified, room temperature or normal temperature in the embodiments of the present application refers to 25±3℃.

[0048] Embodiment 1

[0049] A bio-organic foliar fertilizer comprises the following raw materials in weight fractions:

[0050] 45 parts of soybean protein fermentation liquor, 10 parts of nano-silica aerogel, 12 parts of Bacillus subtilis, 15 parts of fucoidan extract, 8 parts of fulvic acid, 6 parts of trace elements (amino acid chelated iron, EDTA-Ca, sugar alcohol zinc, and ammonium molybdate mixed at a mass ratio of 0.6:0.5:0.1:0.02), 4 parts of chitosan derivative, and 1.5 parts of film-forming agent (sodium carboxymethyl cellulose).

[0051] A preparation method of a bio-organic foliar fertilizer comprises the following steps:

[0052] (1) The soybeans are soaked overnight and then cooked, and then the cooked soybeans are mixed with 3 times the mass of water to form a homogenate, and then the homogenate is inoculated with a composite fermentation bacteria (Bacillus subtilis and yeast at a mass ratio of 3:1) at an inoculation density of 10 7 CFU / mL, and then the mixture is uniformly mixed and subjected to aerobic fermentation at 30℃ for 24h, and then filtered to obtain soybean protein fermentation liquor.

[0053] (2) The nano-silica aerogel is crushed to an average particle size of ≤50μm, and then mixed with the above-mentioned soybean protein fermentation liquor, Bacillus subtilis, fucoidan extract, fulvic acid, trace elements, chitosan derivative, and film-forming agent, and dissolved in 600 times the mass of water to obtain the bio-organic foliar fertilizer.

[0054] Embodiment 2

[0055] A bio-organic foliar fertilizer comprises the following raw materials in weight fractions:

[0056] Soybean protein fermentation liquor 40 parts, nano-silica aerogel 8 parts, Bacillus subtilis 15 parts, alginate extract 13 parts, fulvic acid 6 parts, trace elements (amino acid chelated iron, EDTA-Ca, zinc sugar alcohol, ammonium molybdate are mixed in a mass ratio of 0.6:0.5:0.1:0.02) 8 parts, chitosan derivative 5 parts and film forming agent (low molecular weight chitosan) 0.5 parts.

[0057] A preparation method of a bio-organic foliar fertilizer, comprising the following steps:

[0058] (1) After soaking the soybeans overnight, the soybeans are cooked, and then 3 times the mass of water is added to the cooked soybeans to make a homogenate, and then a composite fermentation bacteria (Bacillus subtilis and yeast bacteria in a mass ratio of 2:1) is inoculated at an inoculation density of 10 6 CFU / mL, and after being uniformly mixed, aerobic fermentation is carried out at 42°C for 12h, and then filtration is performed after the fermentation is completed, to obtain soybean protein fermentation liquor.

[0059] (2) The nano-silica aerogel is crushed to an average particle size of ≤50μm, and then mixed with the soybean protein fermentation liquor, Bacillus subtilis, alginate extract, fulvic acid, trace elements, chitosan derivative and film forming agent, and dissolved in 500 times the mass of water, to obtain the bio-organic foliar fertilizer.

[0060] Example 3

[0061] A bio-organic foliar fertilizer, comprising the following raw materials in weight fractions:

[0062] Soybean protein fermentation liquor 55 parts, nano-silica aerogel 12 parts, Bacillus subtilis 10 parts, alginate extract 20 parts, fulvic acid 9 parts, trace elements (amino acid chelated iron, EDTA-Ca, zinc sugar alcohol, ammonium molybdate are mixed in a mass ratio of 0.6:0.5:0.1:0.02) 3 parts, chitosan derivative 3 parts and film forming agent (sodium alginate) 2 parts.

[0063] A preparation method of a bio-organic foliar fertilizer, comprising the following steps:

[0064] (1) After soaking the soybeans overnight, the soybeans are cooked, and then 3 times the mass of water is added to the cooked soybeans to make a homogenate, and then a composite fermentation bacteria (Bacillus subtilis and yeast bacteria in a mass ratio of 4:1) is inoculated at an inoculation density of 10 8 CFU / mL, and after being uniformly mixed, aerobic fermentation is carried out at 38°C for 48h, and then filtration is performed after the fermentation is completed, to obtain soybean protein fermentation liquor.

[0065] (2) The nano-silica aerogel is crushed to an average particle size of ≤50 μm, and then mixed with the above soybean protein fermentation liquor, Bacillus subtilis, alginate polysaccharide extract, fulvic acid, trace elements, chitosan derivative and film-forming agent, and dissolved in 800 times the mass of water, to obtain the bio-organic foliar fertilizer.

[0066] Comparative Example 1

[0067] The difference from Example 1 is only that the film-forming agent is not included. The remaining raw materials and addition amounts, as well as the process steps and parameters, are the same as those of Example 1.

[0068] Comparative Example 2

[0069] The difference from Example 1 is only that the chitosan derivative is not included. The remaining raw materials and addition amounts, as well as the process steps and parameters, are the same as those of Example 1.

[0070] Comparative Example 3

[0071] The difference from Example 1 is only that the nano-silica aerogel is not included. The remaining raw materials and addition amounts, as well as the process steps and parameters, are the same as those of Example 1.

[0072] Comparative Example 4

[0073] The difference from Example 1 is only that the fulvic acid is not included. The remaining raw materials and addition amounts, as well as the process steps and parameters, are the same as those of Example 1.

[0074] Comparative Example 5

[0075] The difference from Example 1 is only that the nano-silica aerogel and the film-forming agent are not included. The remaining raw materials and addition amounts, as well as the process steps and parameters, are the same as those of Example 1.

[0076] Comparative Example 6

[0077] The difference from Example 2 is only that the film-forming agent and the chitosan derivative are not included. The remaining raw materials and addition amounts, as well as the process steps and parameters, are the same as those of Example 1.

[0078] Technical Effects:

[0079] In late March 2024, spring soybeans (Sudou No. 8) were planted in a soybean planting base in Nanjing City, and multiple test areas of the same planting scale were divided, and the field management was the same as the conventional field management method. During the planting of soybeans, it was learned through weather forecasting that there would be continuous rainfall in the next 48 hours (rainfall warning period), and the biological organic foliar fertilizer obtained by the present application examples 1-3 and comparative examples 1-6 was sprayed in different test areas, the spraying amount per mu was 18L, after the continuous rainfall ended (after the repair period), the field was drained, and the biological organic foliar fertilizer obtained by the present application examples 1-3 and comparative examples 1-6 was sprayed within 24 hours after the drainage ended, the spraying amount per mu was 25L, and after 3-5 days, the biological organic foliar fertilizer obtained by the present application examples 1-3 and comparative examples 1-6 was sprayed again, the spraying amount per mu was 20L. During the spraying process, the back of the soybean leaf (the stomatal dense area) and the stem base were mainly sprayed, and the leaf surface was uniformly covered but not dripped.

[0080] A blank group and two control groups were set, and the only difference from the application method in the foregoing was that: the blank group did not apply the biological organic foliar fertilizer in the present application; the control group 1 only sprayed the biological organic foliar fertilizer obtained by example 1 in the rainfall warning period; the control group 2 only sprayed the biological organic foliar fertilizer obtained by example 1 in the after-repair period. The remaining steps and parameters were the same as those in the application method in the foregoing.

[0081] During the planting of soybeans, the occurrence rate of diseases and pests of soybeans was counted, in the early and middle of July, the soybean harvesting period was entered, and after harvesting, the yield and quality (protein content and fat content, etc.) of soybeans were detected and counted. The results are shown in Table 1:

[0082] Table 1

[0083] Protein content (%) Fat content (%) Disease and pest incidence (%) Hundred-grain weight (g) Yield per mu (kg) Example 1 42.6 21.6 8.2 29.5 258 Example 2 41.8 20.8 8.5 28.7 253 Example 3 42.2 21.3 8.3 28.9 255 Comparative Example 1 39.4 19.4 12.5 26.2 235 Comparative Example 2 38.2 19.8 11.8 26.4 240 Comparative Example 3 38.9 18.3 13.2 25.3 230 Comparative Example 4 38.3 18.1 14.1 24.1 225 Comparative Example 5 38.7 18.6 13.4 24.7 228 Comparative Example 6 39.1 19.1 12.3 25.1 232 Control Group 1 40.1 19.6 10.1 27.3 245 Control Group 2 39.9 19.8 10.3 26.9 242 Blank Group 36.8 17.2 15.5 23.2 210

[0084] As can be seen from Table 1, the biological organic foliar fertilizer provided by the embodiment of the present application can greatly alleviate the negative effects of soybean in waterlogging, relative to the comparative examples and the blank group and the control group, the soybean in the embodiment 1-3 has a significantly reduced occurrence rate of diseases and insect pests during planting, and the protein content and the fat content in the obtained soybean have a significant increase, effectively improving the quality of soybean, at the same time, the yield per mu of soybean in the embodiment 1-3 also has a significant increase. In addition, comparing the comparative examples 1, 3 and 5 with the embodiment 1 can see that, in the comparative example 1, there is no film-forming agent, and the loss of the foliar fertilizer is large due to rainwater washing, reducing the fertilizer utilization rate; in the comparative example 3, the stomatal regulation effect of nano silicon dioxide is lacking, thereby affecting the accumulation of photosynthetic products, so that the single seed weight of soybean is significantly reduced; combining the comparative examples 1, 3 and 5 can obviously see that, the nano silicon dioxide and the sodium hydroxymethyl cellulose in the present application have a certain synergistic effect, specifically, the film layer wear resistance can be improved, a dense and durable film structure is formed on the leaf surface, thereby effectively improving the yield and quality of soybean. Comparing the comparative examples 1, 2 and 6 can see that, in the comparative example 2, the antibacterial property of the chitosan derivative is missing, and combining the comparative examples 1, 2 and 6 can obviously see that, the chitosan and the low molecular weight chitosan in the present application have a certain synergistic effect, specifically, the foliar fertilizer can be promoted to quickly form a film structure on the leaf surface, and the film has moderate flexibility and adhesion, which can effectively protect the nutrients and will not cause damage to the leaves. In the comparative example 4, the protein, fat content and single seed weight of soybean are obviously reduced, which is because the fulvic acid can be synergized with trace elements, the addition of fulvic acid promotes the absorption of trace elements by the soybean leaf, thereby effectively improving the quality of soybean.

[0085] The above merely describes the preferred embodiments of the present application, but the protection scope of the present application is not limited thereto, any changes or replacements within the technical range disclosed by the present application can be easily thought by those skilled in the art, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A bio-organic foliar fertilizer, characterized by, The raw materials include the following weight fractions: 40-55 parts of soybean protein fermentation liquor, 8-12 parts of nano-silica aerogel, 10-15 parts of Bacillus subtilis, 13-20 parts of fucoidan extract, 6-9 parts of fulvic acid, 3-8 parts of trace elements, 3-5 parts of chitosan derivatives, and 0.1-2 parts of film forming agent.

2. The bio-organic foliar fertilizer according to claim 1, characterized in that, The preparation method of the soybean protein fermentation liquor includes the following steps: After the soybean is cooked, water is added to prepare a homogenate, which is then mixed with the composite fermentation bacteria and subjected to aerobic fermentation.

3. The bio-organic foliar fertilizer according to claim 2, characterized in that, The inoculation density of the complex fermentation bacteria is 10 6 -10 8 CFU / mL.

4. The bio-organic foliar fertilizer according to claim 2, characterized in that, The composite fermentation bacteria are Bacillus subtilis and yeast bacteria mixed at a mass ratio of (2-4):

1.

5. The bio-organic foliar fertilizer according to claim 2, characterized in that, The aerobic fermentation is carried out at a temperature of 30-42℃ for 12-48h.

6. The bio-organic foliar fertilizer according to claim 1, characterized in that, The trace elements include one or more of amino acid chelated zinc, EDTA-Ca, sugar alcohol zinc, amino acid chelated iron, ammonium molybdate, EDTA-Mn, and B-mannitol.

7. The bio-organic foliar fertilizer according to claim 1, characterized in that, The film forming agent includes one or more of low molecular weight chitosan, sodium alginate, sodium carboxymethyl cellulose, and starch derivatives.

8. A process for the preparation of a bio-organic foliar fertilizer as claimed in any one of claims 1 to 7, characterized in that, The method includes the following steps: After the raw materials are mixed, they are dissolved in 500-800 times the mass of water to obtain the bio-organic foliar fertilizer.

9. Use of the bio-organic foliar fertilizer according to any one of claims 1-7 in relieving soybean waterlogging damage.

10. Use according to claim 9, characterized in that, The application time of the bio-organic foliar fertilizer includes a rainfall warning period and a post-waterlogging repair period. The application amount in the rainfall warning period is 15-25L / acre. The application amount in the post-waterlogging repair period is 20-30L / acre.