High-efficiency composite foliar fertilizer and preparation method thereof

Abstract

The present application belongs to the technical field of foliar fertilizer, and particularly relates to a high-efficiency composite foliar fertilizer and a preparation method thereof. The present application aims to solve the problem that the existing rice foliar fertilizer cannot simultaneously meet the yield-increasing needs of the first season and the second season of ratooning rice. The present application prepares a fertilizer stock solution by using ammonium nitrate and potassium dihydrogen phosphate, and obtains plant-derived amino acids by defatting pretreatment and enzymatic hydrolysis of rice recycling materials. The fertilizer stock solution is mixed with water-soluble silicon, humic acid, chelated trace elements and brassinolide, and then compounded with the plant-derived amino acids to obtain a water-based foliar fertilizer, and the water-based foliar fertilizer is subjected to cross-linking reaction and self-emulsification treatment to obtain the high-efficiency composite foliar fertilizer. The high-efficiency composite foliar fertilizer provided by the present application can simultaneously meet the yield-increasing needs of the first season and the second season of ratooning rice, and has good application value.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of foliar fertilizers, and particularly relates to a high-efficiency composite foliar fertilizer and a preparation method thereof. BACKGROUND

[0002] In rice planting, the use of various fertilizers is one of the important means to improve yield. Among them, the application of foliar fertilizer is an efficient method of delivering nutrients by directly spraying fertilizer on the surface of rice leaves. Foliar fertilizer can be quickly absorbed and utilized by rice, especially in the late growth period of rice, when the root absorption capacity is weakened, foliar fertilizer can serve as an important source of supplementary nutrition. Common foliar fertilizers contain macronutrients such as nitrogen, phosphorus, potassium, and micronutrients such as zinc, iron, manganese, etc. In addition, some new foliar fertilizers also contain amino acids and biological stimulants in order to achieve better yield-increasing effect. In particular, in the field of ratoon crop planting, the application of foliar fertilizer can effectively improve the yield of ratoon crop and ensure its good quality.

[0003] Although foliar fertilizer has many advantages, its stability is an important technical challenge in practical application. The stability of foliar fertilizer directly affects its effect and service life. The active ingredients in foliar fertilizer are prone to degradation, thereby reducing the biological activity of the fertilizer; in composite foliar fertilizer, the compatibility between components is poor, causing a significant increase in transportation and storage difficulty. Further, the formula of composite foliar fertilizer cannot simultaneously meet the different needs of ratoon crop in the first season and the ratoon season, and cannot simultaneously complete the yield-increasing task of ratoon crop in the first season and the ratoon season.

[0004] At present, the existing rice foliar fertilizer cannot simultaneously meet the yield-increasing needs of ratoon crop in the first season and the ratoon season, which is still an important problem faced by the industry.

[0005] Therefore, a preparation method of high-efficiency composite foliar fertilizer is proposed. SUMMARY

[0006] The purpose of the present application is to provide a high-efficiency composite foliar fertilizer and a preparation method thereof. In the present application, ammonium nitrate and potassium dihydrogen phosphate are used to prepare a fertilizer stock solution, and rice recycling material is subjected to degreasing pretreatment and enzymatic hydrolysis to obtain plant-derived amino acids; the fertilizer stock solution is mixed with water-soluble silicon, humic acid, chelated trace elements and brassinosteroids, and then compounded with plant-derived amino acids to obtain an aqueous foliar fertilizer, and the high-efficiency composite foliar fertilizer is obtained through crosslinking reaction and self-emulsification treatment.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0008] A preparation method of high-efficiency composite foliar fertilizer, comprising the following steps:

[0009] Unless otherwise specified, the parts in the present application refer to mass parts.

[0010] Ammonium nitrate and potassium dihydrogen phosphate are dissolved in water, and the pH value is adjusted to 5-6 to obtain a fertilizer stock solution.

[0011] In the fertilizer stock solution, the mass fraction of ammonium nitrate is 6.5-8 wt%, and the mass fraction of potassium dihydrogen phosphate is 32-33.8 wt%.

[0012] After the rice recycling material is cut and soaked and washed with a 5 wt% sodium hydroxide aqueous solution at 80-100°C for 2 hours, it is washed with water until the pH value is less than 7.5 to obtain a recycling precursor.

[0013] The recycling precursor is used as a reaction substrate, and the operating pH value is adjusted to 6-8 at a substrate concentration of 15 wt%. Papain and endoproteinase Asp-N are added in an amount of 0.5 wt% and 0.3 wt% of the reaction system, respectively. The reaction is carried out at a stirring speed of 500-700 rpm and a temperature of 55-60°C for 8 hours. After the reaction is terminated, a plant-derived amino acid is obtained.

[0014] In the recycling precursor, the rice recycling material includes rice husk, rice bran, and rice straw. The CAS number of papain is 9001-73-4, and the CAS number of endoproteinase Asp-N is 9001-92-7.

[0015] To 200 parts of the fertilizer stock solution, 1.7 parts of water-soluble silicon, 2.2 parts of humic acid, 0.8 parts of chelated trace elements, and 1 part of brassinolide are added. After mixing, a synergistic fertilizer stock solution is obtained.

[0016] 100 parts of the synergistic fertilizer stock solution are mixed with 32 parts of the plant-derived amino acid to obtain an aqueous foliar fertilizer.

[0017] To 200 parts of the aqueous foliar fertilizer, 20 parts of a starch solution are added. After stirring at a speed of 200 rpm and heating to 50-60°C, 15 parts of a urea borate solution are added. After reacting for 60 min, a slow-release foliar fertilizer is obtained.

[0018] 2-3 parts of the self-emulsifying agent are dissolved in 25 parts of deionized water to obtain a self-emulsifying solution. 150 parts of the slow-release foliar fertilizer are heated to 40°C and stirred at a speed of 500 rpm. 10 parts of the self-emulsifying solution are added. After stirring for 3 hours, 0.5 parts of xanthan gum are added, and the mixture is stirred uniformly to obtain a high-efficiency composite foliar fertilizer.

[0019] In the self-emulsifying agent, the mass ratio of alkyl polyglycoside to 2,4-dodecadienal is 1:1.2-1.5, and the average molecular weight of the alkyl polyglycoside is 750 g / mol.

[0020] Preferably, the starch solution comprises corn starch and water, wherein the mass fraction of the corn starch is 10 wt%, the average molecular weight of the corn starch raw material is 3.5*10 4 -2.0*10 5 Da.

[0021] Preferably, the water-soluble silicon is potassium silicate; the humic acid comprises potassium humate and sodium humate, wherein the mass ratio of the potassium humate and the sodium humate is 3:1; the chelated trace element comprises amino acid chelated calcium, amino acid chelated iron and amino acid chelated molybdenum, wherein the mass ratio of the amino acid chelated calcium, the amino acid chelated iron and the amino acid chelated molybdenum is 3:1:1-1.5.

[0022] Preferably, the amino acid chelated molybdenum is molybdenum aspartate, the amino acid chelated calcium is calcium lysinate, and the amino acid chelated iron is ferrous glycinate.

[0023] The high-efficiency composite foliar fertilizer comprises ammonium nitrate, potassium dihydrogen phosphate, plant-derived amino acid, water-soluble silicon and brassinolide; the high-efficiency composite foliar fertilizer can simultaneously meet the yield-increasing requirements of the first season and the regeneration season of the regenerated rice.

[0024] Compared with the prior art, the high-efficiency composite foliar fertilizer has the following beneficial effects:

[0025] 1. By introducing ammonium nitrate as a readily available nitrogen source and converting urea into a slow-release nitrogen source through cross-linking reaction, through significant synergistic effect, the required rapid growth of the regenerated rice in the first season is ensured, and at the same time, the nitrogen element supply for the regeneration season is provided, the frequency of topdressing is reduced, and the maximization of nutrient utilization is realized.

[0026] 2. By introducing water-soluble silicon and humic acid, the utilization rate of nutrients by the regenerated rice plant is improved, and the lodging resistance of the regenerated rice plant is enhanced. Further, through synergistic effect of the water-soluble silicon, the humic acid and the plant-derived amino acid, the root activity of the regenerated rice in the regeneration season is significantly improved, and the yield of the regenerated rice in the regeneration season is improved.

[0027] 3. Through the regulating effect of brassinolide and the slow-release nutrient element system constructed by cross-linking reaction, the growth of the regenerated rice in the first season is promoted, the photosynthesis efficiency is improved, the germination and growth of the dormant buds in the regeneration season are effectively stimulated, and the yield of the regenerated rice in the first season and the regeneration season is improved.

[0028] 4. By introducing a self-emulsifying agent into the composite foliar fertilizer product, an optimized self-emulsifying system is constructed through self-emulsifying treatment, the product has high stability during storage and transportation, and after dilution, the product can quickly form a stable emulsion, the penetration and absorption efficiency of various nutrients and functional substances by the leaves of the regenerated rice is significantly improved, and the efficiency of the composite foliar fertilizer product is effectively ensured. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 This is a flowchart illustrating the preparation process of the high-efficiency compound foliar fertilizer in this invention. Detailed Implementation

[0030] The technical solution of the present invention will be clearly and completely described below through some embodiments and experimental examples. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0031] Reference Figure 1 The process flow diagram shown illustrates that this invention provides a high-efficiency compound foliar fertilizer and its preparation method. The technical solution is as follows:

[0032] Example 1

[0033] Dissolve ammonium nitrate and potassium dihydrogen phosphate in water and adjust the pH to 5 to obtain the fertilizer stock solution.

[0034] The fertilizer concentrate contains 6.5 wt% ammonium nitrate and 32 wt% potassium dihydrogen phosphate.

[0035] After the rice recycled material is chopped, it is soaked and rinsed in a 5wt% sodium hydroxide aqueous solution at 80℃ for 2 hours, and then thoroughly washed with water until the pH is less than 7.5 to obtain the recycling precursor.

[0036] The recovered precursor was used as the reaction substrate. The operating pH was adjusted to 6 at a substrate concentration of 15 wt%. Papain and endoplasmic protease Asp-N were added at a mass of 0.5 wt% of the reaction system. The reaction was carried out at a stirring speed of 500 rpm and a temperature of 55 °C for 8 hours. After the reaction was terminated, plant-derived amino acids were obtained.

[0037] Among them, the recycled rice materials include: rice husks, rice bran and rice straw; the CAS number of papain is 9001-73-4; the CAS number of the endoplasmic protease Asp-N is 9001-92-7.

[0038] Add 1.7 parts water-soluble silicon, 2.2 parts humic acid, 0.8 parts chelated trace elements and 1 part brassinolide to 200 parts of fertilizer stock solution, and mix to obtain enhanced fertilizer stock solution.

[0039] Among them, water-soluble silicon is potassium silicate; humic acid includes potassium humate and sodium humate, wherein the mass ratio of potassium humate to sodium humate is 3:1; chelated trace elements include amino acid chelated calcium, amino acid chelated iron and amino acid chelated molybdenum, wherein the mass ratio of amino acid chelated calcium, amino acid chelated iron and amino acid chelated molybdenum is 3:1:1.

[0040] Among them, amino acid chelated molybdenum is aspartic molybdenum, amino acid chelated calcium is lysine calcium, and amino acid chelated iron is glycine ferrous iron.

[0041] Mix 100 parts of enhanced fertilizer stock solution with 32 parts of plant-derived amino acids to obtain water-based foliar fertilizer.

[0042] Add 20 parts of starch solution to 200 parts of water-based foliar fertilizer, maintain a stirring speed of 200 rpm and heat to 50°C, then add 15 parts of urea boric acid solution, and react for 60 minutes to obtain slow-release foliar fertilizer.

[0043] The starch solution comprises corn starch and water, wherein the mass fraction of corn starch is 10 wt%, and the average molecular weight of the corn starch raw material is 3.5 × 10⁻⁶. 4 -2.0×10 5 Da.

[0044] Dissolve 2 parts of the self-emulsifying agent in 25 parts of deionized water to obtain a self-emulsifying solution; heat 150 parts of slow-release foliar fertilizer to 40°C and stir at 500 rpm, add 10 parts of the self-emulsifying solution, stir continuously for 3 hours, then add 0.5 parts of xanthan gum and stir evenly to obtain a high-efficiency compound foliar fertilizer.

[0045] The self-emulsifiers include alkyl glycosides and 2,4-dodecadienal, with a mass ratio of alkyl glycosides to 2,4-dodecadienal of 1:1.2; the average molecular weight of the alkyl glycosides is 750 g / mol.

[0046] Examples 2-20 differ from Example 1 in operating parameters, but the process steps are the same. Specific parameter changes are summarized in Tables 1 and 2.

[0047] Table 1. Changes in operating parameters in Examples 1-20 (Part 1)

[0048]

[0049] Table 2. Changes in operating parameters for Examples 1-20 (Part 2)

[0050]

[0051] Comparative Example 1

[0052] Unlike Example 1, ammonium nitrate was replaced with an equal amount of potassium nitrate, while other process parameters remained unchanged.

[0053] Comparative Example 2

[0054] Unlike Example 1, potassium dihydrogen phosphate was replaced with an equal amount of diammonium hydrogen phosphate, while other process parameters remained unchanged.

[0055] Comparative Example 3

[0056] Unlike Example 1, urea was not added to the crosslinking reaction, while other process parameters remained unchanged.

[0057] Comparative Example 4

[0058] Unlike Example 6, no water-soluble silicon was added, but other process parameters remained unchanged.

[0059] Comparative Example 5

[0060] Unlike Example 6, plant-derived amino acids were not added; instead, they were replaced with a mixture of equal masses of L-leucine, L-isoleucine, and L-valine in a 1:2:1 ratio, while other process parameters remained unchanged.

[0061] Comparative Example 6

[0062] Unlike Example 6, no humic acid was added, but other process parameters remained unchanged.

[0063] Comparative Example 7

[0064] Unlike Example 11, brassinolide was not added, but other process parameters remained unchanged.

[0065] Comparative Example 8

[0066] Unlike Example 11, boric acid and starch solution were not added for cross-linking reaction; urea was added directly, while other process parameters remained the same.

[0067] Comparative Example 9

[0068] Unlike Example 16, no self-emulsifier was added, but other process parameters remained unchanged.

[0069] Comparative Example 10

[0070] Unlike Example 16, the self-emulsifier was replaced with an equal mass of Tween 80, while other process parameters remained unchanged.

[0071] Experimental Example 1

[0072] The compound foliar fertilizer products prepared in Examples 1-5 and Comparative Examples 1-3 were applied to the first and second seasons of Weiliangyou 8612 ratooning rice. The average plant height (cm) and dry matter accumulation (t / hm) of ratooning rice were recorded at the tillering stage, booting stage, first season maturity stage, and ratooning season maturity stage. 2 ) and the cumulative dry matter at the heading stage during the regeneration season (t / hm) 2 The results are summarized in Tables 3 and 4.

[0073] The statistical data are all 1hm 2 The mean values ​​of relevant data within the experimental field.

[0074] Table 3. First-season growth data of the compound foliar fertilizer products prepared in Examples 1-5 and Comparative Examples 1-3.

[0075]

[0076] Table 4. Regeneration season growth data of the compound foliar fertilizer products prepared in Examples 1-5 and Comparative Examples 1-3.

[0077]

[0078] As shown in Tables 3 and 4, the plant height and dry matter accumulation of Example 1 were significantly higher than those of Comparative Examples 1, 2 and 3 in the first season (tillering stage, booting stage, and maturity stage) and the ratooning season (heading stage and maturity stage), indicating that the compound foliar fertilizer prepared in Example 1 has significant advantages in promoting the growth of ratooning rice in both seasons and increasing biomass.

[0079] Comparative Example 1 used potassium nitrate instead of ammonium nitrate, which lacked the rapid start-up effect provided by ammonium nitrogen, resulting in a significant decrease in the first-season growth rate and subsequent dry matter accumulation. Comparative Example 3 did not add urea in the cross-linking reaction, which meant that the key component of the slow-release nitrogen source was missing, resulting in insufficient nitrogen supply. In particular, the dry matter accumulation in the regeneration season was significantly different from that in Example 1, and the first-season growth was also significantly affected. Comparative Example 2 used diammonium hydrogen phosphate instead of potassium dihydrogen phosphate, which changed the form and ratio of nitrogen and phosphorus, and the growth performance was the worst, which also proved the rationality of the original nitrogen and phosphorus composition.

[0080] In summary, this invention introduces ammonium nitrate as a readily available nitrogen source and utilizes a cross-linking reaction to convert urea into a slow-release nitrogen source. These two sources produce a significant synergistic effect: readily available nitrogen meets the needs for rapid growth initiation in the first crop season, while slow-release nitrogen provides a stable and continuous nitrogen supply for the later stages of the first crop season and the entire ratooning season. Specific nitrogen source selection and nitrogen-phosphorus ratio, combined with the slow-release system formed by the cross-linking reaction, synergistically optimize the nitrogen supply pattern throughout the entire growth period of ratooning rice, maximizing nutrient utilization and significantly improving the growth and dry matter accumulation of ratooning rice in both the first and ratooning seasons. While ensuring the rapid growth required in the first crop season, it provides a continuous nitrogen supply for the ratooning season, thereby increasing the yield of both seasons.

[0081] Experimental Example 2

[0082] The compound foliar fertilizer products prepared in Examples 6-10 and Comparative Examples 4-6 were applied to the first and second seasons of Weiliangyou 8612 ratooning rice, and the number of effective panicles (10) in the first and second seasons were recorded respectively. 4 / hm 2 ) and actual output (t / hm 2 The results are summarized in Table 5.

[0083] The statistical data are all 1hm 2 The mean values ​​of relevant data within the experimental field.

[0084] Table 5. Effective spikelet number and actual yield of the compound foliar fertilizer products prepared in Examples 6-10 and Comparative Examples 4-6.

[0085]

[0086] As shown in Table 5, the effective panicle number and actual yield of the first and second seasons of Examples 6-10 were significantly higher than those of Comparative Examples 4, 5 and 6, indicating that the compound foliar fertilizer prepared in the examples has a significant advantage in improving the panicle formation rate and final yield of the two seasons of ratooning rice.

[0087] Compared with Example 6, Comparative Example 4 lacked water-soluble silicon, resulting in a significant decrease in the number of effective panicles and yield in both the first and second seasons. This indicates that the addition of water-soluble silicon is crucial for improving nutrient utilization and plant vigor. Compared with Example 6, Comparative Example 6 lacked humic acid, and its number of effective panicles and yield were also significantly lower than those in Example 6. This shows that humic acid plays an important role in chelating nutrients, improving the soil and leaf environment, and promoting absorption. Compared with Example 6, Comparative Example 5 lacked plant-derived amino acids prepared by enzymatic hydrolysis of rice recycled materials, leading to a decrease in yield. This indicates that the plant-derived amino acids prepared by the method of this invention contain a complex variety of amino acids, small molecule peptides, and other active substances, and have a synergistic effect with water-soluble silicon and humic acid, especially in improving root vigor and final yield in the second season.

[0088] In summary, the specifically selected water-soluble silicon, humic acid, and plant-derived amino acids prepared from rice reclaimed material through a specific enzymatic hydrolysis process exhibit a significant synergistic effect. Water-soluble silicon and humic acid work together to improve nutrient utilization and plant health. Furthermore, the specific composition of plant-derived amino acids further stimulates crop physiological activity, significantly enhancing root vigor and growth performance during the ratoon season. These specific material selections and preparation processes work together to enable foliar fertilizer products to effectively increase the yield of ratoon rice in both seasons.

[0089] Experimental Example 3

[0090] Referring to Experimental Example 2, the compound foliar fertilizer products prepared in Examples 11-15 and Comparative Examples 7-8 were applied to the first and second seasons of Longliangyou 534 ratooning rice, and the number of effective panicles (10) in the first and second seasons were recorded respectively. 4 / hm 2 ) and actual output (t / hm 2 The results are summarized in Table 6.

[0091] The statistical data are all 1hm 2 The mean values ​​of relevant data within the experimental field.

[0092] Table 6. Effective spikelet number and actual yield of the compound foliar fertilizer products prepared in Examples 11-15 and Comparative Examples 7-8.

[0093]

[0094] As shown in Table 6, the effective panicle number and actual yield of the first and second seasons of Examples 11-15 were significantly higher than those of Comparative Examples 7 and 8, indicating that the compound foliar fertilizer prepared in the examples has significant advantages in promoting panicle formation and increasing yield in both seasons of ratooning rice.

[0095] Compared to Example 11, Comparative Example 7 lacked brassinolide, resulting in a significant decrease in the number of effective spikes and actual yield in both the first and second harvest seasons. This indicates that the regulatory role of brassinolide is crucial for promoting growth, improving photosynthetic efficiency, and stimulating potential in the second harvest season. Compared to Example 11, Comparative Example 8, while retaining brassinolide, did not employ the cross-linking and slow-release treatment of urea with boric acid and starch solution; instead, urea was added directly. In the second harvest season, its number of effective spikes and actual yield were far lower than in Example 11. This demonstrates that the physiological regulatory effect of brassinolide needs to be combined with the specific nutrient element slow-release system constructed in this invention to be fully realized. Simply adding brassinolide without a continuous and stable nutrient supply will significantly reduce its yield-increasing effect.

[0096] In summary, there is a significant synergistic effect between brassinolide and the nutrient slow-release system constructed through cross-linking reactions. Brassinolide effectively regulates crop physiological processes, promotes first-season growth, and stimulates the germination and growth of dormant buds in the regenerating season, while the slow-release system ensures a continuous and stable supply of nutrients during these key growth stages, enabling foliar fertilizer products to simultaneously increase the yield of both the first and regenerating seasons of ratooning rice.

[0097] Experiment Example 4

[0098] The compound foliar fertilizer products prepared in Examples 16-20 and Comparative Examples 9-10 were applied to the first and second seasons of Weiliangyou 8612 ratooning rice. The seed setting rate (%) and dry grain weight (g / 1000) of the two seasons were recorded. The results are summarized in Table 7.

[0099] The statistical data are all 1hm 2 The mean values ​​of relevant data within the experimental field.

[0100] Table 7. Seed setting rate and dry grain weight of the compound foliar fertilizer products prepared in Examples 16-20 and Comparative Examples 9-10

[0101]

[0102] As shown in Table 7, the seed setting rate and thousand-grain weight of the first and second seasons of Examples 16-20 were significantly higher than those of Comparative Examples 9 and 10, indicating that the compound foliar fertilizer prepared in the examples has a significant advantage in improving the final yield components of ratooning rice.

[0103] Compared to Example 16, Comparative Example 9 lacked a self-emulsifier, resulting in a significant decrease in both the seed setting rate and thousand-grain weight in the first and second harvest seasons. This indicates that the self-emulsification system is crucial for ensuring the stable dispersion and efficient absorption of the active ingredients in foliar fertilizer products, and its absence severely affects the product's application effect. Compared to Example 16, Comparative Example 10 used an equal mass of the conventional surfactant Tween 80 to replace the combination of the specific alkyl glycoside and 2,4-dodecadienal of this invention. Although its seed setting rate and thousand-grain weight were better than Comparative Example 9, they were still significantly lower than those of Example 16. This demonstrates that the self-emulsification system constructed by the specific self-emulsifier combination selected in this invention is superior to conventional surfactants in improving product stability, promoting emulsion formation, and enhancing leaf penetration and absorption efficiency.

[0104] In summary, this invention introduces a specific combination of self-emulsifying agents, namely a specific ratio of alkyl glycosides and 2,4-dodecadienal, and constructs an optimized self-emulsifying system through a specific self-emulsifying treatment process, rather than simply adding commonly used surfactants. This specific system ensures the high stability of the product during storage, transportation, and dilution, and can quickly form a stable, fine emulsion, thereby significantly improving the penetration and absorption efficiency of various nutrients and functional substances by the leaves of ratooned rice. This, in turn, guarantees the high efficiency of the compound foliar fertilizer product and increases the yield of ratooned rice in both the first and second harvests.

[0105] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a high-efficiency compound foliar fertilizer, characterized in that: The preparation method is as follows: Dissolve ammonium nitrate and potassium dihydrogen phosphate in water, adjust the pH to 5-6, and obtain the fertilizer stock solution; The rice recycled material was pretreated by defatting to obtain a recycling precursor. The recycling precursor was then enzymatically hydrolyzed to obtain plant-derived amino acids. Water-soluble silicon, humic acid, chelated trace elements and brassinolide were added to the fertilizer stock solution, and the mixture was then used to obtain an enhanced fertilizer stock solution. The enhanced fertilizer stock solution is mixed with the plant-derived amino acids to obtain an aqueous foliar fertilizer; A starch solution was added to the aqueous foliar fertilizer, followed by the addition of a urea-boric acid solution, and a cross-linking reaction was carried out to obtain a slow-release foliar fertilizer. The urea-boric acid solution comprises: deionized water, sodium tetraborate decahydrate, and urea; the mass ratio of the deionized water, the sodium tetraborate decahydrate, and the urea is 100:5:

20. A self-emulsifying agent is added to the slow-release foliar fertilizer, and the high-efficiency compound foliar fertilizer is obtained after self-emulsification treatment; The self-emulsifying agent comprises alkyl glycoside and 2,4-dodecadienal, wherein the mass ratio of the alkyl glycoside to the 2,4-dodecadienal is 1:1.2-1.

5. The self-emulsification process is as follows: by weight, 2-3 parts of the self-emulsifier are dissolved in 25 parts of deionized water to obtain a self-emulsifying solution; the slow-release foliar fertilizer is heated and stirred, the self-emulsifying solution is added, and after continuous stirring, xanthan gum is added to obtain the high-efficiency compound foliar fertilizer.

2. The method for preparing a high-efficiency compound foliar fertilizer according to claim 1, characterized in that: In the fertilizer stock solution, the mass fraction of ammonium nitrate is 6.5-8 wt%, and the mass fraction of potassium dihydrogen phosphate is 32-33.8 wt%.

3. The method for preparing a high-efficiency compound foliar fertilizer according to claim 1, characterized in that: The rice recycled material includes rice husks, rice bran, and rice straw. The defatting pretreatment process is as follows: the rice recycled material is chopped, soaked and rinsed in sodium hydroxide aqueous solution at 80-100℃, and then thoroughly washed with water to obtain the recycled precursor. The enzymatic hydrolysis process is as follows: the recycled precursor is used as a reaction substrate, the pH value is adjusted to 6-8 at a substrate concentration of 15wt%, papain and endoplasmin Asp-N are added at a mass of 0.5wt% of the reaction system, and the reaction is carried out at a stirring speed of 500-700rpm and a temperature of 55-60℃ for 8 hours. After terminating the reaction, the plant-derived amino acids are obtained.

4. The method for preparing a high-efficiency compound foliar fertilizer according to claim 1, characterized in that: The water-soluble silicon is potassium silicate; the humic acid includes potassium humate and sodium humate, wherein the mass ratio of potassium humate to sodium humate is 3:1; the chelated trace elements include amino acid chelated calcium, amino acid chelated iron, and amino acid chelated molybdenum, wherein the mass ratio of amino acid chelated calcium, amino acid chelated iron, and amino acid chelated molybdenum is 3:1:1-1.

5.

5. The method for preparing a high-efficiency compound foliar fertilizer according to claim 1, characterized in that: The starch solution comprises corn starch and water, wherein the mass fraction of the corn starch is 10 wt%; the cross-linking reaction process is as follows: by mass fraction, 20 parts of the starch solution are added to 200 parts of water-based foliar fertilizer, stirred and heated to 50-60°C, then 15 parts of the urea-boric acid solution are added, and the reaction is carried out for 60 minutes to obtain the slow-release foliar fertilizer.

6. A high-efficiency compound foliar fertilizer, characterized in that: The high-efficiency compound foliar fertilizer is prepared by the preparation method described in any one of claims 1-5; The high-efficiency compound foliar fertilizer includes: ammonium nitrate, potassium dihydrogen phosphate, plant-derived amino acids, water-soluble silicon, and brassinolide.

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