A small-molecule organic fertilizer based on crop root response and a preparation method thereof

Abstract

This invention relates to a small-molecule organic fertilizer based on crop root response and its preparation method, belonging to the field of organic fertilizer technology. The invention first modifies fly ash through alkali treatment, then mixes it sequentially with sodium citrate and low-molecular-weight polyacrylamide to obtain a self-made composite regulator. Subsequently, the regulator is mixed with the small-molecule organic fertilizer for adsorption to obtain the target fertilizer. The active hydroxyl groups of the alkali-modified fly ash form a stable hydrogen bond network with the amide groups of the polyacrylamide, enhancing rhizosphere water holding capacity and diluting salts. Sodium citrate enhances network stability through complexation and hydrogen bonding, while forming a soluble complex that prevents nutrient accumulation and facilitates crop utilization. Furthermore, the network hydrogel morphology of the regulator improves soil porosity, promotes root growth, synergistically enhances nutrient absorption efficiency, and significantly increases crop yield. The small-molecule organic fertilizer prepared by this invention has the effect of long-term soil moisture retention and significantly increases crop yield upon application.

Description

Technical Field

[0001] This invention relates to the field of organic fertilizer synthesis technology, specifically to a small-molecule organic fertilizer based on crop root response and its preparation method. Background Technology

[0002] In intensive agriculture, excessive fertilization is common, leading to the accumulation of phosphorus and potassium ions in the topsoil and excessively high rhizosphere salt concentrations. This causes water seepage from crop roots, making water absorption difficult and significantly reducing fertilizer utilization. While fly ash is used for soil improvement, unmodified fly ash has few active groups, resulting in weak synergistic effects with fertilizer components. Traditional fertilizer synergists often focus solely on water retention or nutrient activation, failing to address the multiple needs of rhizosphere water and fertilizer retention, salt dilution, soil porosity optimization, and root growth promotion. Furthermore, conventional combinations of soil conditioners and organic fertilizers lack targeting and cannot achieve controlled nutrient release and efficient root absorption through hydrogen bonding networks and complexation. Therefore, there is an urgent need to develop a novel small-molecule fertilizer system with multi-mechanism synergy. Summary of the Invention

[0003] The purpose of this invention is to provide a small-molecule organic fertilizer based on crop root response and its preparation method, so as to solve the problems existing in the prior art.

[0004] To address the aforementioned technical problems, this invention provides the following technical solution: a small-molecule organic fertilizer based on crop root response, prepared from the following components in parts by weight: 10-30 parts of homemade compound regulator, 60-80 parts of decomposed crop straw, 30-40 parts of fermented amino acid liquid, 20-30 parts of biostimulant, 10-15 parts of growth regulator, 4-8 parts of potassium dihydrogen phosphate, 1-2 parts of growth stimulant adjuvant, 3-5 parts of molasses and 2-4 parts of microbial agent; The method for preparing the small molecule organic fertilizer includes the following steps: (1) After the pretreated fly ash is modified by alkali treatment, it is mixed with sodium citrate at a mass ratio of 10:6~8, stirred at room temperature for 30 min, and then 0.05~0.1 times the mass of fly ash of low molecular weight polyacrylamide is added and stirred for 1~3 h. The mixture is then aged at room temperature in the dark for 12 h to obtain the self-made composite regulator. (2) After the composite regulator is blended and adsorbed with the above-mentioned components in the specified weight proportions at room temperature, it is dried at 30°C for 12 hours, pulverized and sieved to obtain a small molecule organic fertilizer based on crop root response. The low molecular weight polyacrylamide is anionic with a molecular weight of 1,000,000.

[0005] Furthermore, the decomposed crop straw is: decomposed corn straw.

[0006] Furthermore, the fermented amino acid liquid is prepared by deep fermentation of corn stalks and soybean meal as the main protein raw materials and enzymatic hydrolysis with EM bacteria agent. The total amino acid content is ≥10%, including aspartic acid, glutamic acid, serine, glycine, alanine, leucine and other free amino acids, with a free amino acid content of ≥8%.

[0007] Furthermore, the biostimulant is potassium humate.

[0008] Furthermore, the growth regulator is: seaweed extract.

[0009] Furthermore, the growth stimulant adjuvant is brassinolide.

[0010] Furthermore, the bacterial agent is an EM bacterial agent with a total viable count ≥ 1 billion CFU / mL.

[0011] Furthermore, the fly ash in step (1) has a particle size of 100~200 mesh.

[0012] Furthermore, an application of a small-molecule organic fertilizer based on crop root response involves digging three holes 8-10 cm deep around the crop roots at a distance of 10-15 cm. 5-8 g of the small-molecule organic fertilizer is applied to each hole, covered with soil, and then 0.5-1 L of water is slowly poured onto the soil surface after application, ensuring that the water penetrates to the bottom of the hole and moistens the soil around the roots.

[0013] Compared with the prior art, the beneficial effects achieved by the present invention are: This invention mixes a self-made compound regulator with small-molecule organic fertilizer to achieve long-term soil moisture retention and significantly increase crop yield upon application.

[0014] This invention first modifies fly ash through alkali treatment, then mixes it sequentially with sodium citrate and low molecular weight polyacrylamide to obtain a self-made composite regulator. This regulator is then mixed with small-molecule organic fertilizer for adsorption, resulting in a small-molecule organic fertilizer based on crop root response. The active hydroxyl groups generated on the surface of the alkali-modified fly ash after alkali activation can form a stable hydrogen bond network with the amide groups in the polyacrylamide molecule, significantly improving the water-holding capacity of the rhizosphere soil, diluting local salts, and directly counteracting water seepage caused by excessive fertilization. The carboxyl groups of sodium citrate can complex with metal ions on the surface of the alkali-modified fly ash and also form hydrogen bonds with the amide groups of polyacrylamide, further enhancing the stability and reactivity of the hydrogen bond network. Simultaneously, it can react with excess fertilizer in the soil... , The formation of soluble complexes through complexation not only prevents phosphorus and potassium from accumulating in the topsoil but also allows them to be decomposed and utilized by organic acids secreted by the roots, thus improving fertilizer utilization. The reticulated hydrogel morphology of the self-made soil conditioner can improve soil porosity, promote root elongation and branching, increase the contact area between the roots and fertilizer, synergistically enhance nutrient absorption efficiency, and significantly increase crop yield. Detailed Implementation

[0015] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. 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.

[0016] To more clearly illustrate the method provided by the present invention, the following embodiments are provided in detail. The testing methods for various indicators of the small molecule organic fertilizer based on crop root response prepared in the following embodiments are as follows: Yield test: The crop planted was corn "Denghai 605"; the fertilizer applied was the organic fertilizer prepared in Examples 1-5 and Comparative Examples 1-7; a plot with uniform soil fertility was selected and divided into 12 plots, marked as 1-12, each plot being 20m-30m in size. The prepared fertilizer was applied to the roots of the crop. No additional fertilizer was applied during the entire corn growth period, and other management measures remained the same.

[0017] Water retention performance test: 1.0g of fertilizer granules prepared in Examples 1-5 and Comparative Examples 1-7 were thoroughly mixed with 200g of dry soil (passed through a 20-mesh sieve) and placed in 500mL beakers. The mixtures were then left at room temperature. A certain amount of tap water was added to each beaker until the soil sample was saturated, and the weight was recorded as M. The samples were weighed every two days and recorded as M1. The ratio of M1 to M was used to evaluate the fertilizer's water retention performance on the soil.

[0018] Example 1 (1) Take an appropriate amount of fly ash with a particle size of 100 mesh and place it in a forced-air drying oven. Set the temperature to 105℃ and dry it at a constant temperature for 24 hours to remove moisture. After drying, take it out and sieve it with a 200 mesh standard test sieve to remove impurity particles larger than 200 mesh. Collect the powder under the sieve and place it in a dry and sealed container for later use. (2) The pretreated fly ash was slowly added to a 2M sodium hydroxide aqueous solution with a mass of 3 times that of the fly ash. The mixture was stirred and refluxed at 300 rpm at 70°C for 4 hours. After cooling naturally to room temperature, the mixture was filtered and washed with deionized water until the filtrate was neutral. The mixture was dried in a forced-air dryer at 105°C for 12 hours. After grinding, the mixture was passed through a 200-mesh sieve to obtain alkali-modified fly ash powder. (3) Mix alkali-modified fly ash powder, sodium citrate powder and deionized water in a mass ratio of 10:6:50, stir at 300 rpm for 30 min at room temperature, add anionic polyacrylamide with a molecular weight of 1,000,000 and keep stirring for 3 h. The amide group forms a hydrogen bond network with the active hydroxyl group on the surface of alkali-modified fly ash, and at the same time forms a hydrogen bond with the carboxyl group of sodium citrate to enhance the stability of the network. After stirring, place it in a cool and ventilated place and let it stand for 12 h to form a uniform network hydrogel morphology, thus obtaining the self-made composite regulator. (4) Weigh the following components by weight: 10 parts of self-made compound regulator, 60 parts of decomposed corn straw, 30 parts of fermented amino acid liquid with corn straw and soybean meal as the main protein raw materials, which is prepared by liquid deep fermentation and enzymatic hydrolysis of EM bacteria agent, with a total amino acid content ≥10%, including aspartic acid, glutamic acid, serine, glycine, alanine, leucine and other free amino acids, with a free amino acid content ≥8%, 20 parts of potassium humate, 10 parts of seaweed extract, 4 parts of potassium dihydrogen phosphate, 1 part of brassinolide, 3 parts of molasses and 2 parts of EM bacteria agent with a total live bacteria count ≥1 billion CFU / mL, add them to a double helix mixer, set the mixing speed to 150 rpm, mix and adsorb at room temperature for 3 hours, stop the machine every 45 minutes, and use a shovel to help turn it once to ensure that the self-made compound regulator and the small molecule organic fertilizer are in full contact and complete the adsorption process, dry at 30℃ for 12 hours, crush and pass through an 80-mesh sieve to obtain small molecule organic fertilizer based on crop root response; (5) Dig three holes 8 cm deep around the crop roots at a distance of 10 cm. Apply 5 g of small molecule organic fertilizer to each hole, cover with soil, and then water 0.5 L per plant. Slowly water the soil surface after covering the holes to ensure that the water penetrates to the bottom of the holes and moistens the soil around the roots.

[0019] Example 2 (1) Take an appropriate amount of fly ash with a particle size of 120 mesh and place it in a forced-air drying oven. Set the temperature to 105℃ and dry it at a constant temperature for 24 hours to remove moisture. After drying, take it out and sieve it with a 200 mesh standard test sieve to remove impurity particles larger than 200 mesh. Collect the powder under the sieve and place it in a dry and sealed container for later use. (2) The pretreated fly ash was slowly added to a 2M sodium hydroxide aqueous solution with a mass of 3.5 times that of the fly ash. The mixture was stirred and refluxed at 300 rpm at 72°C for 4.5 h. After cooling to room temperature, the mixture was filtered and washed with deionized water until the filtrate was neutral. The mixture was dried in a forced-air dryer at 105°C for 12 h. After grinding, the mixture was passed through a 200-mesh sieve to obtain alkali-modified fly ash powder. (3) Mix alkali-modified fly ash powder, sodium citrate powder and deionized water in a mass ratio of 10:6.5:50 and stir at 300 rpm for 30 min at room temperature. Add anionic polyacrylamide with a molecular weight of 1,000,000, which is 0.06 times the mass of fly ash and stir for 1.5 h. The amide group forms a hydrogen bond network with the active hydroxyl group on the surface of alkali-modified fly ash and forms a hydrogen bond with the carboxyl group of sodium citrate to enhance the stability of the network. After stirring, place it in a cool and ventilated place and let it stand for 12 h to form a uniform network hydrogel morphology, thus obtaining the self-made composite regulator. (4) Weigh the following components by weight: 15 parts self-made compound regulator, 65 parts decomposed corn stalks, 32 parts fermented amino acid liquid made from corn stalks and soybean meal as the main protein raw materials, after liquid deep fermentation and enzymatic hydrolysis with EM bacteria, with a total amino acid content ≥10%, including aspartic acid, glutamic acid, serine, glycine, alanine, leucine and other free amino acids, with a free amino acid content ≥8%, 22 parts potassium humate, 11 parts seaweed extract, 5 parts potassium dihydrogen phosphate, 1.2 parts brassinolide, 3.5 parts molasses, and 2.5 parts EM bacterial agent with a total viable count ≥1 billion CFU / mL were added to a double helix mixer. The mixing speed was set to 150 rpm, and the mixture was mixed and adsorbed at room temperature for 3 hours. During this period, the machine was stopped every 45 minutes, and the mixture was turned over with a shovel to ensure that the self-made compound regulator and the small molecule organic fertilizer were in full contact to complete the adsorption process. The mixture was then dried at a constant temperature of 30℃ for 12 hours, pulverized, and passed through an 80-mesh sieve to obtain a small molecule organic fertilizer based on crop root response. (5) Dig three holes 8.5 cm deep around the crop roots at a distance of 11 cm. Apply 6 g of small molecule organic fertilizer to each hole, cover with soil, and then water 0.6 L per plant. Slowly water the soil surface after covering the holes to ensure that the water penetrates to the bottom of the holes and moistens the soil around the roots.

[0020] Example 3 (1) Take an appropriate amount of fly ash with a particle size of 150 mesh and place it in a forced-air drying oven. Set the temperature to 105℃ and dry it at a constant temperature for 24 hours to remove moisture. After drying, take it out and sieve it with a 200 mesh standard test sieve to remove impurity particles larger than 200 mesh. Collect the powder under the sieve and place it in a dry and sealed container for later use. (2) The pretreated fly ash was slowly added to a 2M sodium hydroxide aqueous solution with a mass of 4 times that of the fly ash. The mixture was stirred and refluxed at 300 rpm at 75°C for 5 hours. After cooling naturally to room temperature, the mixture was filtered and washed with deionized water until the filtrate was neutral. The mixture was dried in a forced-air dryer at 105°C for 12 hours. After grinding, the mixture was passed through a 200-mesh sieve to obtain alkali-modified fly ash powder. (3) Mix alkali-modified fly ash powder, sodium citrate powder and deionized water in a mass ratio of 10:7:50 and stir at 300 rpm for 30 min at room temperature. Add anionic polyacrylamide with a molecular weight of 1,000,000, which is 0.07 times the mass of fly ash and stir for 2 h. The amide group forms a hydrogen bond network with the active hydroxyl group on the surface of alkali-modified fly ash and forms a hydrogen bond with the carboxyl group of sodium citrate to enhance the stability of the network. After stirring, place it in a cool and ventilated place and let it stand for 12 h to form a uniform network hydrogel morphology, thus obtaining the self-made composite regulator. (4) Weigh the following components by weight: 20 parts self-made compound regulator, 70 parts decomposed corn stalks, 35 parts fermented amino acid liquid made from corn stalks and soybean meal as the main protein raw materials, after liquid deep fermentation and enzymatic hydrolysis with EM bacteria, with a total amino acid content ≥10%, including aspartic acid, glutamic acid, serine, glycine, alanine, leucine and other free amino acids, with a free amino acid content ≥8%, 25 parts potassium humate, 13 parts seaweed extract, and 6 parts dihydrogen phosphate. Potassium, 1.5 parts brassinolide, 4 parts molasses, and 3 parts EM bacterial agent with a total viable count ≥1 billion CFU / mL were added to a double helix mixer. The mixing speed was set to 150 rpm, and the mixture was mixed and adsorbed at room temperature for 3 hours. During this period, the machine was stopped every 45 minutes, and the mixture was turned over once with a shovel to ensure that the self-made compound regulator and the small molecule organic fertilizer were in full contact to complete the adsorption process. The mixture was then dried at a constant temperature of 30℃ for 12 hours, pulverized, and passed through an 80-mesh sieve to obtain a small molecule organic fertilizer based on crop root response. (5) Dig three holes 9 cm deep around the crop roots at a distance of 13 cm. Apply 7 g of small molecule organic fertilizer to each hole, cover with soil, and then water 0.8 L per plant. Slowly water the soil surface after covering the holes to ensure that the water penetrates to the bottom of the holes and moistens the soil around the roots.

[0021] Example 4 (1) Take an appropriate amount of fly ash with a particle size of 180 mesh and place it in a forced-air drying oven. Set the temperature to 105℃ and dry it at a constant temperature for 24 hours to remove moisture. After drying, take it out and sieve it with a 200 mesh standard test sieve to remove impurity particles larger than 200 mesh. Collect the powder under the sieve and place it in a dry and sealed container for later use. (2) The pretreated fly ash was slowly added to a 2M sodium hydroxide aqueous solution with a mass of 4.5 times that of the fly ash. The mixture was stirred and refluxed at 300 rpm at 78°C for 5.5 h. After cooling to room temperature, the mixture was filtered and washed with deionized water until the filtrate was neutral. The mixture was dried in a forced-air dryer at 105°C for 12 h. After grinding, the mixture was passed through a 200-mesh sieve to obtain alkali-modified fly ash powder. (3) Mix alkali-modified fly ash powder, sodium citrate powder and deionized water in a mass ratio of 10:7.5:50 and stir at 300 rpm for 30 min at room temperature. Add anionic polyacrylamide with a molecular weight of 1,000,000 and 0.09 times the mass of fly ash and stir for 2.5 h. The amide group forms a hydrogen bond network with the active hydroxyl group on the surface of alkali-modified fly ash and forms a hydrogen bond with the carboxyl group of sodium citrate to enhance the stability of the network. After stirring, place it in a cool and ventilated place and let it stand for 12 h to form a uniform network hydrogel morphology, thus obtaining the self-made composite regulator. (4) Weigh the following components by weight: 25 parts self-made compound regulator, 75 parts decomposed corn stalks, 38 parts fermented amino acid liquid made from corn stalks and soybean meal as the main protein raw materials, after liquid deep fermentation and enzymatic hydrolysis with EM bacteria, with a total amino acid content ≥10%, including aspartic acid, glutamic acid, serine, glycine, alanine, leucine and other free amino acids, with a free amino acid content ≥8%, 28 parts potassium humate, 14 parts seaweed extract, 7 parts potassium dihydrogen phosphate, 1.8 parts brassinolide, 4.5 parts molasses and 3.5 parts EM bacterial agent with a total viable count ≥1 billion CFU / mL were added to a double helix mixer. The mixing speed was set to 150 rpm and the mixture was mixed and adsorbed at room temperature for 3 hours. During the process, the machine was stopped every 45 minutes and the mixture was turned over with a shovel to ensure that the self-made compound regulator and the small molecule organic fertilizer were in full contact to complete the adsorption process. The mixture was then dried at a constant temperature of 30℃ for 12 hours, pulverized and passed through an 80-mesh sieve to obtain a small molecule organic fertilizer based on crop root response. (5) Dig three holes with a depth of 9.5 cm around the crop roots at a distance of 14 cm. Apply 7.5 g of small molecule organic fertilizer to each hole, cover with soil, and then water 0.9 L per plant. Slowly water the soil surface after covering the holes to ensure that the water penetrates to the bottom of the holes and moistens the soil around the roots.

[0022] Example 5 (1) Take an appropriate amount of fly ash with a particle size of 200 mesh and place it in a forced-air drying oven. Set the temperature to 105℃ and dry it at a constant temperature for 24 hours to remove moisture. After drying, take it out and sieve it with a 200 mesh standard test sieve to remove impurity particles larger than 200 mesh. Collect the powder under the sieve and place it in a dry and sealed container for later use. (2) The pretreated fly ash was slowly added to a 2M sodium hydroxide aqueous solution with a mass of 5 times that of the fly ash. The mixture was stirred and refluxed at 300 rpm at 80°C for 6 hours. After cooling naturally to room temperature, the mixture was filtered and washed with deionized water until the filtrate was neutral. The mixture was dried in a forced-air dryer at 105°C for 12 hours. After grinding, the mixture was passed through a 200-mesh sieve to obtain alkali-modified fly ash powder. (3) Mix alkali-modified fly ash powder, sodium citrate powder and deionized water in a mass ratio of 10:8:50 and stir at 300 rpm for 30 min at room temperature. Add anionic polyacrylamide with a molecular weight of 1,000,000, which is 0.1 times the mass of fly ash and stir for 3 h. The amide group forms a hydrogen bond network with the active hydroxyl group on the surface of alkali-modified fly ash and forms a hydrogen bond with the carboxyl group of sodium citrate to enhance the stability of the network. After stirring, place it in a cool and ventilated place and let it stand for 12 h to form a uniform network hydrogel morphology, thus obtaining the self-made composite regulator. (4) Weigh the following components by weight: 30 parts of self-made compound regulator, 80 parts of decomposed corn stalks, 40 parts of fermented amino acid liquid with corn stalks and soybean meal as the main protein raw materials, which is prepared by liquid deep fermentation and enzymatic hydrolysis of EM bacteria agent, with a total amino acid content ≥10%, including aspartic acid, glutamic acid, serine, glycine, alanine, leucine and other free amino acids, and a free amino acid content ≥8%, 30 parts of potassium humate, 15 parts of seaweed extract, 8 parts of potassium dihydrogen phosphate, 2 parts of brassinolide, 5 parts of molasses and 4 parts of EM bacteria agent with a total live bacteria count ≥1 billion CFU / mL, add them to a double helix mixer, set the mixing speed to 150 rpm, mix and adsorb at room temperature for 3 hours, stop the machine every 45 minutes, and use a shovel to help turn it once to ensure that the self-made compound regulator and the small molecule organic fertilizer are in full contact and complete the adsorption process, dry at 30℃ for 12 hours, crush and pass through an 80-mesh sieve to obtain small molecule organic fertilizer based on crop root response; (5) Dig three holes 10cm deep around the crop roots at a distance of 15cm. Apply 8g of small molecule organic fertilizer to each hole, cover with soil, and then water 1L per plant. Slowly water the soil surface after covering the holes to ensure that the water penetrates to the bottom of the holes and moistens the soil around the roots.

[0023] Comparative Example 1 The difference between Comparative Example 1 and Example 3 is that step (1) is omitted, and step (2) is changed to: slowly adding 150-mesh fly ash to a 2M sodium hydroxide aqueous solution with a particle size of 4 times the mass of fly ash, stirring and refluxing at 300 rpm at 75°C for 5 hours, naturally cooling to room temperature, filtering and washing with deionized water until the filtrate is neutral, drying at 105°C for 12 hours, grinding and passing through a 200-mesh sieve to obtain alkali-modified fly ash powder, and the remaining steps are the same as in Example 3.

[0024] Comparative Example 2 The difference between Comparative Example 2 and Example 3 is that step (2) is omitted, and step (3) is changed to: mixing pretreated fly ash powder, sodium citrate powder and deionized water in a mass ratio of 10:7:50, stirring at 300 rpm for 30 min at room temperature, adding anionic polyacrylamide with a molecular weight of 1,000,000 at 0.07 times the mass of fly ash and stirring for 2 h. The amide group forms a hydrogen bond network with the active hydroxyl groups on the surface of alkali-modified fly ash, and at the same time forms a hydrogen bond with the carboxyl group of sodium citrate, which strengthens the stability of the network. After stirring, it is placed in a cool and ventilated place and left to stand for 12 h to form a uniform network hydrogel morphology, thus obtaining the self-made composite regulator. The remaining steps are the same as in Example 3.

[0025] Comparative Example 3 The difference between Comparative Example 3 and Example 3 lies in step (3). Step (3) is changed to: mixing alkali-modified fly ash powder, sodium citrate powder and deionized water in a mass ratio of 10:7:50, stirring at 300 rpm for 30 min at room temperature, and after stirring, placing it in a cool and ventilated place and letting it stand for 12 h to form a uniform network hydrogel morphology, thus obtaining the self-made composite regulator. The remaining steps are the same as in Example 3.

[0026] Comparative Example 4 The difference between Comparative Example 4 and Example 3 lies in step (3). Step (3) is changed to: mixing alkali-modified fly ash powder and deionized water at a mass ratio of 10:50, stirring at 300 rpm for 30 min at room temperature, adding anionic polyacrylamide with a molecular weight of 1,000,000 at 0.07 times the mass of fly ash, and stirring for 2 h. The amide groups form a hydrogen bond network with the active hydroxyl groups on the surface of the alkali-modified fly ash. After stirring, place it in a cool and ventilated place and let it stand for 12 h to allow the system to form a uniform network hydrogel morphology, thus obtaining the self-made composite regulator. The remaining steps are the same as in Example 3.

[0027] Comparative Example 5 The difference between Comparative Example 5 and Example 3 is that steps (1) and (2) are omitted, and step (3) is changed to: Sodium citrate powder and deionized water are mixed in a mass ratio of 10:7:50 and stirred at 300 rpm for 30 min at room temperature. Anionic polyacrylamide with a molecular weight of 1,000,000 is added at 0.1 times the mass of sodium citrate powder and stirred for 2 h. The amide group forms hydrogen bonds with the carboxyl group of sodium citrate. After stirring, the mixture is placed in a cool and ventilated place and allowed to stand for 12 h to form a uniform network hydrogel morphology, thus obtaining the self-made composite regulator. The remaining steps are the same as in Example 3.

[0028] Comparative Example 6 The difference between Comparative Example 6 and Example 3 is that steps (1), (2), and (3) are omitted, and step (4) is changed to: weigh the following components by weight: 70 parts of decomposed corn stalks, 35 parts of fermented amino acid liquid made from corn stalks and soybean meal as the main protein raw materials, which is obtained by liquid deep fermentation and enzymatic hydrolysis with EM bacteria agent, with a total amino acid content ≥10%, including aspartic acid, glutamic acid, serine, glycine, alanine, leucine and other free amino acids, with a free amino acid content ≥8%, and 25 parts of yellow Potassium humate, 13 parts seaweed extract, 6 parts potassium dihydrogen phosphate, 1.5 parts brassinolide, 4 parts molasses, and 3 parts EM bacterial agent with a total viable count ≥1 billion CFU / mL were added to a double helix mixer. The mixing speed was set to 150 rpm, and the mixture was mixed and adsorbed at room temperature for 3 hours. During this period, the machine was stopped every 45 minutes, and the mixture was turned over once with the help of a shovel. The mixture was then dried at a constant temperature of 30°C for 12 hours. After pulverizing and passing through an 80-mesh sieve, a small molecule organic fertilizer based on crop root response was obtained. The remaining steps were the same as in Example 3.

[0029] Comparative Example 7 Comparative Example 7 served as the control group, with commercially available ordinary fertilizer added for the experiment.

[0030] Example of effect Table 1 below presents the performance analysis results of small molecule organic fertilizers based on crop root response using Examples 1 to 5 and Comparative Examples 1 to 7 of the present invention.

[0031] Table 1

[0032] Comparison of experimental data on crop yield in the examples and comparative examples revealed that the present invention first modifies fly ash by alkali treatment, then mixes it sequentially with sodium citrate and low molecular weight polyacrylamide to obtain a self-made composite regulator. This regulator is then mixed with small molecule organic fertilizer for adsorption, resulting in a small molecule organic fertilizer based on crop root response. The carboxyl groups of sodium citrate can complex with metal ions on the surface of alkali-modified fly ash and form hydrogen bonds with the amide groups of polyacrylamide, further enhancing the stability and reactivity of the hydrogen bond network. Simultaneously, it can react with excess fly ash in the soil... , The formation of soluble complexes through complexation not only prevents the accumulation of phosphorus and potassium in the topsoil but also allows them to be decomposed and utilized by organic acids secreted by the roots, thus improving fertilizer utilization. The reticulated hydrogel morphology of the self-made soil conditioner can improve soil porosity, promote root elongation and branching, increase the contact area between roots and fertilizer, synergistically improve nutrient absorption efficiency, and significantly increase crop yield. A comparison of the experimental data on soil water retention rate in the examples and comparative examples reveals that the active hydroxyl groups generated on the surface of alkali-modified fly ash in this invention, after alkali activation, can form a stable hydrogen bond network with the amide groups in the polyacrylamide molecule, which can significantly improve the water-holding capacity of the rhizosphere soil, dilute local salts, and directly counteract water seepage caused by excessive fertilizer concentration.

[0033] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No markings in the claims should be construed as limiting the scope of the claims.

Claims

1. A small-molecule organic fertilizer based on crop root response, characterized in that, It was prepared from the following components in parts by weight: 10-30 parts of homemade compound regulator, 60-80 parts of decomposed crop straw, 30-40 parts of fermented amino acid liquid, 20-30 parts of biostimulant, 10-15 parts of growth regulator, 4-8 parts of potassium dihydrogen phosphate, 1-2 parts of growth stimulant adjuvant, 3-5 parts of molasses and 2-4 parts of microbial agent; The method for preparing the small molecule organic fertilizer includes the following steps: (1) After the pretreated fly ash is modified by alkali treatment, it is mixed with sodium citrate and deionized water at a mass ratio of 10:6~8:50, stirred at room temperature for 30 min, and then 0.05~0.1 times the mass of fly ash of low molecular weight polyacrylamide is added and stirred for 1~3 h. The mixture is then aged at room temperature in the dark for 12 h to obtain the self-made composite regulator. (2) After the composite regulator is blended and adsorbed with the above-mentioned components in the specified weight proportions at room temperature, it is dried at 30°C for 12 hours, pulverized and sieved to obtain a small molecule organic fertilizer based on crop root response. The low molecular weight polyacrylamide is anionic with a molecular weight of 1,000,000.

2. The small-molecule organic fertilizer based on crop root response according to claim 1, characterized in that, The decomposed crop straw is: decomposed corn straw.

3. The small-molecule organic fertilizer based on crop root response according to claim 1, characterized in that, The fermented amino acid liquid is made from corn stalks and soybean meal as the main protein raw materials, through liquid deep fermentation with EM bacteria and enzymatic hydrolysis, with a total amino acid content ≥10% and a free amino acid content ≥8%.

4. The small-molecule organic fertilizer based on crop root response according to claim 1, characterized in that, The biostimulant is potassium humate.

5. A small-molecule organic fertilizer based on crop root response according to claim 1, characterized in that, The growth regulator is: seaweed extract.

6. A small-molecule organic fertilizer based on crop root response according to claim 1, characterized in that, The growth stimulant adjuvant is brassinolide.

7. A small-molecule organic fertilizer based on crop root response according to claim 1, characterized in that, The bacterial agent is an EM bacterial agent with a total viable count ≥ 1 billion CFU / mL.

8. A small-molecule organic fertilizer based on crop root response according to claim 1, characterized in that, The fly ash in step (1) has a particle size of 100~200 mesh.

9. An application of a small-molecule organic fertilizer based on crop root response according to claim 1, characterized in that, Dig three holes 8-10 cm deep around the crop roots, 10-15 cm away. Apply 5-8 g of small molecule organic fertilizer to each hole, cover with soil, and then water each plant with 0.5-1 L of water slowly on the soil surface after covering, ensuring that the water penetrates to the bottom of the hole and moistens the soil around the roots.

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