Small molecule peptide organic composite synergistic foliar fertilizer and preparation method thereof

Abstract

The present invention relates to the field of fertilizers, and specifically discloses a small molecule peptide organic composite synergistic foliar fertilizer and a preparation method thereof. The foliar fertilizer comprises the following raw materials, calculated by mass percentage of 100%, including 2-6% small molecule peptides, 15-25% fulvic acid, 4-7% microbial natural active enzymes, 3-8% adhesives, 1-3% stabilizers, and the remainder is deionized water; the adhesive is prepared by oxidation and phosphorylation of non-monosaccharides. The composite synergistic foliar fertilizer of the present invention is mainly composed of small molecule peptides, fulvic acid and microbial natural active enzymes, and improves the growth quality of plants through the interaction between the three, and improves the utilization rate of foliar fertilizer on the leaf surface through the adhesive.

Description

Technical Field

[0001] The invention belongs to the technical field of fertilizers, and in particular relates to a small-molecule peptide organic composite synergistic foliar fertilizer and a preparation method thereof. Background Art

[0002] Foliar fertilizer is a plant nutrient sprayed on the surface of crop leaves. Compared with traditional agricultural fertilization, it is simple, fast, efficient, high in nutrients, and easy for plants to absorb and utilize. According to the composition and function of foliar fertilizers, it can be divided into the following six categories: (1) Nutritional foliar fertilizers: Contains macroelements or trace elements required for crop growth, such as nitrogen, phosphorus, potassium, etc., which can promote crop growth and prevent diseases, such as potassium dihydrogen phosphate, potassium phosphite, etc.; (2) Regulatory foliar fertilizers: Contains plant growth regulators, which can effectively regulate crop growth and development, such as auxins, plant growth inhibitors, etc.; (3) Biological foliar fertilizers: Contains microorganisms, seaweed and other organisms that are symbiotic or mutualistic with crops, or includes their fermentation or metabolites, which can promote crop growth and metabolism, improve stress resistance, and prevent diseases and pests, such as ammonia. (4) Fertilizer-type foliar fertilizer: a nutrient fertilizer containing some fungicides or plant disease-resistant substances, which can promote crop growth and development and improve the ability of crops to prevent diseases and pests; (5) Rare earth foliar fertilizer: contains rare earth elements, which can promote seed germination and emergence, enhance crop resistance, improve photosynthesis, and help improve quality; (6) Composite foliar fertilizer: composed of a variety of ingredients, it can be mixed with macroelements and trace elements, as well as amino acids, humic acid and other substances. It has various functions. While providing comprehensive nutrition for crops, it can also promote plant photosynthesis and regulate growth and development.

[0003] In recent years, the application of foliar fertilizer has become an efficient cultivation technology to promote crop growth. Although the research on foliar fertilizer in my country started relatively late, it has made rapid progress. For example, patent CN118496029A discloses a water-soluble fertilizer made by mixing small molecule peptide stock solution, mineral source potassium humate and elemental fertilizer, which contains a large number of elements or trace elements required for crop growth, and the nutrition is relatively comprehensive, which can improve the growth rate and yield of plants. For example, patent CN112640711B uses nano-selenium, small molecule peptides, amino acids, and EM bacteria solutions to spray the leaves and trunks of grapefruit trees comprehensively, which can effectively prevent and treat grapefruit tree Huanglongbing, and is a special fertilizer under the medicinal subdivision field. The fertilizers provided by the above patents are all liquid fertilizers that can be sprayed. Liquid fertilizers can be applied as foliar fertilizers, but their adhesion on the leaves will affect the absorption of effective substances by plants. Therefore, a high-adhesion foliar fertilizer is urgently needed on the market. Summary of the invention

[0004] In order to overcome the deficiencies of the above-mentioned prior art, the present invention takes small molecule peptides, fulvic acid and microbial natural active enzymes as the main body, and obtains a composite synergistic foliar fertilizer through the interaction between the three, which can improve the growth quality of plants; in addition, the present invention obtains a non-toxic and harmless adhesive by oxidizing and phosphorylating non-monosaccharides, and utilizes hydrogen bonding or chemical bonding with hydroxyl groups or other functional groups on the leaf surface to improve the utilization rate of foliar fertilizer on the leaf surface. On this basis, the activity of the enzyme and the adhesion of the adhesive are guaranteed by a stabilizer.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] On the one hand, the present invention provides a small molecule peptide organic composite synergistic foliar fertilizer, which comprises the following raw materials, calculated by mass percentage of 100%, including 2-6% small molecule peptide, 15-25% fulvic acid, 4-7% microbial natural active enzyme, 3-8% adhesive, 1-3% stabilizer, and the balance is deionized water; the adhesive is prepared from non-monosaccharide through oxidation and phosphorylation.

[0007] The present invention utilizes the interaction between small molecule peptides, fulvic acid and natural active enzymes of microorganisms to improve the growth quality of plants. Among them, fulvic acid has the effects of promoting plant growth, controlling stomatal opening, reducing transpiration, improving drought resistance, improving stress resistance and increasing yield of crops. After entering the plant body, it can activate the activity of multiple enzymes, regulate crop metabolic activities, thereby promoting the synthesis and accumulation of substances such as sugars, starch, and protein, promoting growth and improving quality. Small molecule peptides can be recognized and combined by plant cells at extremely low concentrations, open the intercellular signal transduction process, regulate the growth and proliferation of plants, and because of their rapid absorption and transport characteristics, can improve the nutrient absorption efficiency and biostimulation of plants. Bioactive enzymes can promote the activity of enzymes in plants, accelerate various biochemical reactions in the process of plant growth, thereby improving the utilization efficiency of nutrients by plants, and enhancing the stress resistance of plants.

[0008] In some embodiments, the non-monosaccharide is any one of sucrose, trehalose, and maltose.

[0009] Preferably, the non-monosaccharide is trehalose.

[0010] Trehalose is a non-reducing disaccharide formed by the dehydration of two molecules of glucose. Compared with other non-monosaccharides, trehalose has good stability under acidic conditions, will not be easily hydrolyzed, and is conducive to the formation of aldehyde groups. At the same time, the molecular size of the adhesive obtained with trehalose as the matrix is ​​appropriate, with good fluidity and wettability, and can be smoothly spread on the leaf surface. The trehalose base of the adhesive sprayed on the leaf surface can maintain the cell osmotic regulation level and reduce the damage caused by low temperature stress.

[0011] In some embodiments, the preparation steps of the adhesive are as follows:

[0012] Dissolve non-monosaccharide in deionized water, introduce nitrogen, add sodium periodate in three equal batches at 10-15°C, stir for 6-10 hours after the addition is completed, then add barium chloride, continue stirring for 0.5-1.0 hours, filter to obtain a saccharide aldehyde solution, then add a composite phosphoric acid solution with a concentration of 1-3wt%, stir for 0.5-1.0 hours, and obtain an adhesive.

[0013] The raw materials of the adhesive prepared by the invention are environmentally friendly and non-toxic and harmless to crops. Firstly, polysaccharides are oxidized by sodium periodate to obtain saccharide aldehydes. The electron-absorbing aldehyde groups can form hydrogen bonds or chemical bonds with hydroxyl groups or other functional groups on the leaf surface to improve the adhesion on the leaf surface. On this basis, the invention phosphorylates the remaining hydroxyl groups of the obtained aldehyde polysaccharide. The phosphate groups have a large negative charge density and a hydration film, and can form stable hydrogen bonds or salt bridges with enzymes, thereby mediating interactions between or within molecules and improving the stability and activity of the enzymes.

[0014] In some embodiments, the molar ratio of the non-monosaccharide to sodium periodate is 1:(2-5).

[0015] The present invention controls the molar ratio of non-monosaccharide to sodium periodate to ensure that the aldehyde group obtained by oxidation can provide sufficient adhesion; at the same time, a certain amount of hydroxyl groups available for phosphorylation can be retained to ensure the stability and activity of the enzyme.

[0016] In some embodiments, the composite phosphoric acid solution is prepared by dissolving sodium tripolyphosphate and sodium trimetaphosphate in deionized water.

[0017] The sodium tripolyphosphate-sodium trimetaphosphate composite solution used in the present invention has mild reaction conditions and efficient phosphorylation effect in the phosphorylation reaction.

[0018] In some embodiments, the mass ratio of sodium tripolyphosphate to sodium trimetaphosphate is (5-8):1.

[0019] In some embodiments, the ratio of the non-monosaccharide to the complex phosphoric acid solution is 1 mol: (250-500) mL.

[0020] The invention ensures the introduction of a certain amount of phosphate groups by controlling the dosage of the composite phosphoric acid solution and the ratio of sodium tripolyphosphate to sodium trimetaphosphate therein.

[0021] In some embodiments, the small molecule peptide is any one or more of fish protein peptide, soybean peptide, corn peptide or yeast peptide.

[0022] Preferably, the small molecule peptide is a fish protein peptide.

[0023] Fish protein peptides are usually composed of 2-10 amino acids, with a molecular weight of less than 1000 Daltons, which makes them easier to enter cells than other small molecule peptides and speed up the absorption of plants. Their combination with fulvic acid can further improve the absorption and operation of trace elements in plants. In addition, the amino acids in fish protein can increase the synthesis of disease-resistant substances in plants, thereby enhancing the disease resistance of plants; the unsaturated fatty acids contained in fish protein can maintain the fluidity of plant cell membranes, maintain the integrity of cell membranes, and lower the freezing point of water in plants, thereby improving the resistance of crops to low temperatures; the bioactive glycolipids contained in fish protein can activate the leaves of crops and promote the absorption of nutrients by plants, thereby improving the utilization rate of fertilizers and prolonging the fertilizer effect, and improving the disease resistance, anti-aging and stress resistance of crops.

[0024] In some embodiments, the preparation step of the stabilizer is as follows: N-methylpyrrolidone and citric acid are stirred at 50-60° C. for 20-60 min to obtain the stabilizer.

[0025] In some embodiments, the molar ratio of N-methylpyrrolidone to citric acid is 1:(1.0-1.3).

[0026] Since the phosphate group in the adhesive can affect the electron density distribution of the aldehyde group through electron displacement, it may affect the stability of the conjugated electron system of the aldehyde group, thereby causing a decrease in adhesion. Citric acid may improve the stability of the aldehyde group by competing with the phosphate group. On this basis, the present invention reacts citric acid with N-methylpyrrolidone to obtain a viscous liquid, maintains the rigidity of the enzyme through electrostatic interaction, and enhances the stability of the enzyme structure.

[0027] On the other hand, the present invention provides a method for preparing the above-mentioned small molecule peptide organic composite synergistic foliar fertilizer, comprising the following preparation steps: first dissolving the adhesive in deionized water, then adding the microbial natural active enzyme and the stabilizer, stirring for 10-20 minutes, then sequentially adding the small molecule peptide and fulvic acid, and stirring evenly to obtain the small molecule peptide organic composite synergistic foliar fertilizer.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The present invention utilizes the interaction between small molecule peptides, fulvic acid and natural active enzymes of microorganisms to obtain a composite synergistic foliar fertilizer. The foliar fertilizer can promote the photosynthesis of plants well through the absorption capacity of plants for small molecule peptides, the organic matter of fulvic acid, and the combination of biologically active enzymes, thereby improving the growth quality of plants and increasing the yield of fruits.

[0030] 2. The present invention provides an adhesive prepared by oxidation and phosphorylation of a non-monosaccharide. The raw material of the adhesive is environmentally friendly, non-toxic and harmless to crops. It can improve the adhesion on the leaf surface by hydrogen bonding or chemical bonding with hydroxyl groups or other functional groups on the leaf surface, and has good fluidity and wettability, and can be smoothly spread on the leaf surface; at the same time, the phosphate group obtained by phosphorylation has a large negative charge density and hydration film, which can form a stable hydrogen bond or salt bridge with the enzyme, thereby improving the stability and activity of the enzyme.

[0031] 3. The present invention accelerates the absorption rate of plants through the specifically selected fish protein peptides, and the combination of the fish protein peptides and fulvic acid can further improve the absorption and operation capacity of plants for trace elements.

[0032] 4. The present invention utilizes a stabilizer to improve the activity of the enzyme and the stability of the aldehyde group in the attachment agent. DETAILED DESCRIPTION

[0033] The present invention will be described below in conjunction with specific embodiments. It should be noted that the following embodiments are examples of the present invention and are only used to illustrate the present invention, but not to limit the present invention. Other combinations and various modifications within the concept of the present invention may be performed without departing from the spirit or scope of the present invention.

[0034] It is worth noting that the raw materials used in the following preparation examples and embodiments, unless otherwise specified, are from any commercially available manufacturer:

[0035] Microbial natural active enzymes were purchased from Yunnan Hedi Fertilizer Co., Ltd.

[0036] Preparation Example 1

[0037] The preparation steps of adhesive A are as follows:

[0038] 1 mol of trehalose was dissolved in 5 L of deionized water, nitrogen was introduced, and a total of 3.5 mol of sodium periodate was added in three batches at 12°C. After the addition was completed, it was stirred for 8 hours, and then 2 mol of barium chloride was added. The stirring was continued for 0.5 hours, and the solution was filtered to obtain a saccharide aldehyde solution. Then, 350 mL of a 2 wt % composite phosphoric acid solution was added, in which the mass ratio of sodium tripolyphosphate to sodium trimetaphosphate was 6:1. The solution was stirred for 0.5 hours to obtain an adhesive A.

[0039] Preparation Example 2

[0040] The preparation steps of adhesive B are as follows:

[0041] Dissolve 1 mol of trehalose in 5 L of deionized water, introduce nitrogen, and add a total of 3.5 mol of sodium periodate in three equal batches at 12°C. Stir for 8 h after the addition is complete. Then add 2 mol of barium chloride, continue stirring for 0.5 h, and filter to obtain adhesive B.

[0042] Preparation Example 3

[0043] The preparation steps of adhesive C are as follows:

[0044] 1 mol of trehalose was dissolved in 5 L of deionized water, nitrogen was introduced, 350 mL of a 2 wt % composite phosphoric acid solution was added, the mass ratio of sodium tripolyphosphate to sodium trimetaphosphate in the composite phosphoric acid solution was 6:1, and the mixture was stirred for 0.5 h to obtain an adhesive C.

[0045] Preparation Example 4

[0046] The preparation steps of adhesive D are as follows:

[0047] The difference between this preparation example and preparation example 1 is that the amount of sodium periodate used is 1.8 mol.

[0048] Preparation Example 5

[0049] The preparation steps of adhesive E are as follows:

[0050] The difference between this preparation example and preparation example 1 is that the amount of sodium periodate used is 5.2 mol.

[0051] Preparation Example 6

[0052] The preparation steps of adhesive F are as follows:

[0053] The difference between this preparation example and preparation example 1 is that the mass ratio of sodium tripolyphosphate to sodium trimetaphosphate in the composite phosphoric acid solution is 4.5:1.

[0054] Preparation Example 7

[0055] The preparation steps of adhesive G are as follows:

[0056] The difference between this preparation example and preparation example 1 is that the mass ratio of sodium tripolyphosphate to sodium trimetaphosphate in the composite phosphoric acid solution is 8.5:1.

[0057] Preparation Example 8

[0058] The preparation steps of stabilizer A are as follows:

[0059] Stir 1 mol of N-methylpyrrolidone and 1.2 mol of citric acid at 55°C for 40 minutes to obtain a stabilizer.

[0060] Preparation Example 9

[0061] The preparation steps of stabilizer B are as follows:

[0062] The difference between this preparation example and preparation example 8 is that the amount of citric acid used is 0.9 mol.

[0063] Preparation Example 10

[0064] The preparation steps of stabilizer C are as follows:

[0065] The difference between this preparation example and preparation example 8 is that the amount of citric acid used is 1.5 mol.

[0066] Example 1

[0067] A small molecule peptide organic composite synergistic foliar fertilizer comprises the following raw materials, calculated by mass percentage of 100%, including 4% fish protein peptide, 20% fulvic acid, 5% microbial natural active enzyme, 6% adhesive A, 2% stabilizer A, and the balance is deionized water.

[0068] The preparation method of the small molecule peptide organic composite synergistic foliar fertilizer in this embodiment comprises the following steps: firstly dissolving the attachment agent A in deionized water, then adding the microbial natural active enzyme and the stabilizer A, stirring for 20 minutes, then sequentially adding the fish protein peptide and the fulvic acid, and stirring evenly to obtain the small molecule peptide organic composite synergistic foliar fertilizer.

[0069] Example 2

[0070] A small molecule peptide organic composite synergistic foliar fertilizer comprises the following raw materials 100% by mass: 2% fish protein peptide, 15% fulvic acid, 4% microbial natural active enzyme, 3% adhesive A, 1% stabilizer A, and the balance is deionized water.

[0071] The preparation method of the small molecule peptide organic composite synergistic foliar fertilizer in this embodiment is the same as that in Example 1.

[0072] Example 3

[0073] A small molecule peptide organic composite synergistic foliar fertilizer comprises the following raw materials 100% by mass: 6% fish protein peptide, 25% fulvic acid, 7% microbial natural active enzyme, 8% adhesive A, 3% stabilizer A, and the balance is deionized water.

[0074] The preparation method of the small molecule peptide organic composite synergistic foliar fertilizer in this embodiment is the same as that in Example 1.

[0075] Example 4

[0076] This embodiment provides a small molecule peptide organic composite synergistic foliar fertilizer and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that: the adhesive A is replaced by an equal amount of the adhesive B.

[0077] Example 5

[0078] This embodiment provides a small molecule peptide organic composite synergistic foliar fertilizer and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that: the adhesive A is replaced by an equal amount of adhesive C.

[0079] Example 6

[0080] This embodiment provides a small molecule peptide organic composite synergistic foliar fertilizer and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that: the adhesive A is replaced by an equal amount of adhesive D.

[0081] Example 7

[0082] This embodiment provides a small molecule peptide organic composite synergistic foliar fertilizer and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that: the adhesive A is replaced by an equal amount of adhesive E.

[0083] Example 8

[0084] This embodiment provides a small molecule peptide organic composite synergistic foliar fertilizer and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that: the adhesive A is replaced by an equal amount of adhesive F.

[0085] Example 9

[0086] This embodiment provides a small molecule peptide organic composite synergistic foliar fertilizer and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that: the adhesive A is replaced by an equal amount of adhesive G.

[0087] Example 10

[0088] This embodiment provides a small molecule peptide organic composite synergistic foliar fertilizer and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that stabilizer A is replaced by an equal amount of stabilizer B.

[0089] Embodiment 11

[0090] This embodiment provides a small molecule peptide organic composite synergistic foliar fertilizer and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that stabilizer A is replaced by an equal amount of stabilizer C.

[0091] Comparative Example 1

[0092] This comparative example provides a small molecule peptide organic composite synergistic foliar fertilizer and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that the stabilizer is replaced by an equal amount of citric acid.

[0093] Performance Testing:

[0094] 1. Adhesion ability test: 5 μL of the small molecule peptide organic composite synergistic foliar fertilizer provided in Examples 1-11 and Comparative Example 1 was added to a micro-injector, and the expansion diameter of the droplet was measured by a JC2000D3 contact angle meter produced by Shanghai Zhongchen Digital Technology Equipment Co., Ltd.

[0095] 2. Enzyme survival test: The small molecule peptide organic composite synergistic foliar fertilizers provided in Examples 1-11 and Comparative Example 1 were left to stand for 30 days and then observed under a microscope.

[0096] The results of performance tests 1 and 2 are shown in Table 1.

[0097] Table 1

[0098]

[0099]

[0100] As can be seen from the data in Table 1, the foliar fertilizer enzyme survival rate of Examples 1-3 is high, and its expansion diameter is greater than 9mm, indicating that the droplet wetting rate is strong and can be well attached to the leaf surface. Compared with Example 1, the adhesive used in Example 4 is not phosphorylated after oxidation, which has little effect on the expansion diameter, but reduces the enzyme survival rate; the adhesive used in Example 5 is directly phosphorylated, so that the aldehyde group is reduced and the expansion diameter becomes smaller, indicating that the adhesion of the foliar fertilizer is reduced; the adhesive used in Examples 6-7 changes the amount of sodium periodate during synthesis, the former reduces the obtained aldehyde group, thereby affecting the adhesion, and the latter obtains too many aldehyde groups occupying the hydroxyl site, limiting the later phosphorylation, thereby affecting the enzyme activity; Examples 8-9 change the mass ratio of sodium tripolyphosphate and sodium trimetaphosphate in the composite phosphoric acid solution, which has limited effect on the adhesion effect, mainly affecting the enzyme activity. Compared with Example 1, Comparative Example 1 directly uses citric acid, which is not conducive to improving the adhesion and enzyme survival rate of the foliar fertilizer. Combined with Examples 10-11, it can be seen that the adjustment of the dosage ratio of citric acid and N-methylpyrrolidone will affect the adhesion and enzyme survival rate.

[0101] 3. Fertilizer efficiency test:In this experiment, rice was used as the test crop to assess the effect of foliar fertilizer on the growth promotion of crops. Experimental groups 1-3 corresponded to Examples 1-3, respectively. The control group did not apply foliar fertilizer. The soil of the test plot was sandy loam. The area of ​​each test plot was 1 mu, and a total of 4 mu of test plots were used. The organic matter content was 13 g / kg, the pH was 8.0, the rice variety planted was Nanjing 9108, and the cultivation method was machine transplanting. The application equipment was a DJI plant protection drone, and the rice was applied once at the tillering stage (7.16), jointing stage (8.11), and heading stage (8.30) of rice, respectively. Each time the spraying was performed, 50 g / mu of 98% potassium dihydrogen phosphate was added. The rice in each treatment area was visually inspected for any phytotoxicity on the 3rd, 5th, and 7th days after each application. The rice panicle length, the first internode at the base, and the yield were measured on October 22. The results are shown in Table 2.

[0102] Table 2

[0103]

[0104]

[0105] The ear length and yield of rice in Table 2 indicate that the foliar fertilizer can improve the growth quality of plants. Combined with Table 1, it can be seen that the adhesion, enzyme survival rate and the effect of improving the growth quality of plants are basically positively correlated.

[0106] The embodiments and comparative examples described above do not impose any form of limitation on the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A small molecule peptide organic composite synergistic foliar fertilizer, characterized in that: The invention comprises the following raw materials by mass percentage: 2-6% of small molecule peptides, 15-25% of fulvic acid, 4-7% of natural active enzymes of microorganisms, 3-8% of adhesives, 1-3% of stabilizers, and the balance is deionized water; the adhesive is prepared from non-monosaccharides through oxidation and phosphorylation.

2. The small molecule peptide organic composite synergistic foliar fertilizer according to claim 1, characterized in that: The non-monosaccharide is any one of sucrose, trehalose and maltose.

3. The small molecule peptide organic composite synergistic foliar fertilizer according to claim 1, characterized in that: The preparation steps of the adhesive are as follows: Dissolve non-monosaccharide in deionized water, introduce nitrogen, add sodium periodate in three equal batches at 10-15°C, stir for 6-10 hours after the addition is completed, then add barium chloride, continue stirring for 0.5-1.0 hours, filter to obtain a saccharide aldehyde solution, then add a composite phosphoric acid solution with a concentration of 1-3wt%, stir for 0.5-1.0 hours, and obtain an adhesive.

4. The small molecule peptide organic composite synergistic foliar fertilizer according to claim 3, characterized in that: The molar ratio of the non-monosaccharide to sodium periodate is 1:(2-5).

5. The small molecule peptide organic composite synergistic foliar fertilizer according to claim 3, characterized in that: The composite phosphoric acid solution is prepared by dissolving sodium tripolyphosphate and sodium trimetaphosphate in deionized water.

6. The small molecule peptide organic composite synergistic foliar fertilizer according to claim 5, characterized in that: The mass ratio of the sodium tripolyphosphate to sodium trimetaphosphate is (5-8):

1.

7. The small molecule peptide organic composite synergistic foliar fertilizer according to claim 3, characterized in that: The ratio of the non-monosaccharide to the complex phosphoric acid solution is 1 mol: (250-500) mL.

8. The small molecule peptide organic composite synergistic foliar fertilizer according to claim 1, characterized in that: The small molecule peptide is any one or more of fish protein peptide, soybean peptide, corn peptide or yeast peptide.

9. The small molecule peptide organic composite synergistic foliar fertilizer according to claim 1, characterized in that: The preparation steps of the stabilizer are as follows: N-methylpyrrolidone and citric acid are stirred at 50-60° C. for 20-60 minutes to obtain the stabilizer.

10. A method for preparing the small molecule peptide organic composite synergistic foliar fertilizer according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: firstly dissolving the attachment in deionized water, then adding the natural active enzyme of microorganisms and the stabilizer, stirring for 10-20 minutes, then sequentially adding the small molecule peptide and fulvic acid, and stirring evenly to obtain the small molecule peptide organic composite synergistic foliar fertilizer.

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