A soil nutrient regulator for crop planting and a preparation method thereof

Abstract

This application relates to the field of soil conditioning technology, specifically to a soil nutrient regulator for crop cultivation and its preparation method, comprising the following raw materials by weight: 20-40 parts organic fermentation liquid, 1-3 parts sodium glutamate, 30-50 parts adsorbent filler, 10-15 parts water-absorbing resin, and 10-15 parts binder; the raw materials also contain at least one of the following by weight: 0.01-2 parts indolebutyric acid, 0.01-2 parts naphthaleneacetic acid, or 0.001-0.5 parts S-inducer; the binder is composed of polylactic acid, sulfonated modified lignin, polyvinyl alcohol, and silane coupling agent in a weight ratio of (10-15):(5-8):(3-5):(0.5-2); through the combination of various raw materials and the preparation method, the resulting soil nutrient regulator is not only safe and pollution-free, but also improves the comprehensive properties of soil, such as fertilization, aeration, water retention, and resistance to pests and diseases, thus promoting the growth and development of crops.

Description

Technical Field

[0001] This application relates to the field of soil conditioning technology, specifically to a soil nutrient regulator for crop cultivation and its preparation method. Background Technology

[0002] Crops play a vital role in people's diets. They are not only delicious but also provide the human body with abundant nutrients. For example, crops are an important source of vitamins, especially vitamin C, vitamin K, folic acid, and various B vitamins. These vitamins play an important role in maintaining normal physiological functions, promoting cell repair and regeneration, and enhancing immunity. Crops are also rich in minerals such as potassium, magnesium, iron, and calcium. These minerals are essential for maintaining heart health, bone strength, and blood formation. In addition, crops are rich in dietary fiber, which helps promote intestinal peristalsis, prevent constipation, and help maintain the balance of gut microbiota, thereby protecting gut health.

[0003] In order to ensure a continuous supply of a certain crop and meet market demand, many places tend to practice continuous cropping. Continuous cropping refers to planting the same crop continuously on the same plot of land. This can improve land use efficiency. For farmers, continuous cropping helps maintain the relative stability of local crop varieties and techniques, making it easier to master and manage the planting techniques of the same type of crop and reducing the technical learning costs caused by variety changes. At the same time, in order to increase crop yield and ensure the appearance of crops, chemical fertilizers and pesticides are used for a long time. However, long-term continuous cropping can lead to the excessive consumption of some nutrients in the soil, while other elements are relatively enriched, resulting in nutrient imbalance. Continuous cropping also causes pathogens and pests to accumulate in the soil, increasing the probability and severity of disease and pest occurrence. In addition, long-term continuous cropping will damage the soil structure, reduce permeability, and decrease water and fertilizer retention capacity. The long-term use of chemical fertilizers and pesticides will further aggravate the problems of soil compaction and soil pollution.

[0004] To improve soil conditions in crop cultivation, soil nutrient conditioners are needed. Soil nutrient conditioners, also commonly known as soil amendments or soil conditioners, are products used to improve the physical, chemical, and biological properties of soil, typically increasing soil aeration and replenishing soil fertility.

[0005] However, existing soil nutrient regulators still have some shortcomings. Due to issues with the formulation of raw materials, the nutrients in the soil are released too quickly and cannot be effective in the long term. Their effect on regulating crop growth is not significant, and their comprehensive capabilities, such as resistance to pests and diseases and water retention, are insufficient. Summary of the Invention

[0006] This application aims to overcome at least one of the defects of the prior art and provide a soil nutrient regulator for crop planting and its preparation method. By combining a variety of raw materials and using a specific method, the prepared soil nutrient regulator is not only safe and pollution-free, but also can improve the comprehensive performance of soil, such as fertilization, aeration, water retention, and resistance to diseases and pests, and promote the growth and development of crops.

[0007] In a first aspect, embodiments of this application provide a soil nutrient regulator for crop cultivation, achieved through the following technical solution:

[0008] A soil nutrient conditioner for crop cultivation, comprising the following raw materials in parts by weight:

[0009] 20-40 parts organic fermentation broth, 1-3 parts monosodium glutamate, 30-50 parts adsorbent filler, 10-15 parts water-absorbing resin, and 10-15 parts binder.

[0010] The raw materials used in the preparation also contain at least one of the following by weight: 0.01-2 parts indolebutyric acid, 0.01-2 parts naphthaleneacetic acid, or 0.001-0.5 parts S-inducer.

[0011] The adhesive is composed of polylactic acid, sulfonated modified lignin, polyvinyl alcohol, and silane coupling agent in a weight ratio of (10-15):(5-8):(3-5):(0.5-2);

[0012] The method for preparing the sulfonated modified lignin includes the following steps:

[0013] Lignin and Na2SO3 were mixed evenly at a weight ratio of (3-5):(2-3), and a 15% NaOH solution was added. The mixture was reacted at 150-200℃ for 3-5 hours to obtain sulfonated modified lignin.

[0014] The preparation method of the adsorbent filler includes the following steps:

[0015] B1. Add volcanic mud, Al2O3 powder, and activated carbon powder to an aqueous solution of silane coupling agent, sonicate and stir to prepare a suspension;

[0016] B2. Carboxyethyl cellulose is added to the suspension to form a slurry, which is then dried and ground to produce a composite powder.

[0017] B3. Weigh 30-40 parts by weight of zeolite particles, 20-30 parts by weight of coal gangue powder, 30-40 parts by weight of clay, 4-8 parts by weight of ammonium bicarbonate, and 35-50 parts by weight of the composite powder, mix them evenly, add 25-35 parts by weight of water, granulate, and make granules.

[0018] B4. The particles are preheated to 105-115℃, then calcined at 500-700℃ and cooled to produce an adsorbent filler.

[0019] The soil nutrient conditioner for crop cultivation according to the embodiments of this application has at least the following beneficial effects:

[0020] This application combines adsorbent filler with various raw materials such as organic fermentation liquid, plant growth regulators, and monosodium glutamate. Some nutrients are adsorbed into the interior by the adsorbent filler, which can slow down the release rate of nutrients and plant growth regulators in the organic fermentation liquid. The raw materials work synergistically to promote each other, fully exert the effects of each raw material, replenish the organic matter and nutrients in the soil, improve soil fertility, and promote plant growth and development.

[0021] The adhesive of this application is water-soluble and does not easily clog the adsorption pores of the adsorbent filler. The adhesive can be naturally degraded in the soil. The adhesive raw materials themselves and their degradation products are environmentally friendly. The adhesive is rich in a large number of hydroxyl and carboxyl functional groups. After being applied to the soil, its functional groups can aggregate and bind soil particles through electrostatic adsorption, forming large-diameter soil particles with a granular structure. This effectively improves the soil structure, enhances the soil particles' resistance to erosion, disintegration, and water stability, and improves water retention and soil stabilization. The polylactic acid molecular chains in the adhesive contain a large number of ester bonds and carboxyl groups. These functional groups have a strong interaction with water molecules, thereby absorbing water from the soil and helping plants absorb water, further improving water retention.

[0022] The polylactic acid and lignin in the adhesive of this application are both derived from renewable resources. Polylactic acid is biodegradable, so the adhesive has excellent environmental performance. Lignin has abundant active functional groups such as phenolic hydroxyl groups, which endow it with strong chemical reactivity and bonding properties. After sulfonation modification, the dispersibility and compatibility of lignin in polylactic acid emulsion are improved, further enhancing the bonding performance of the adhesive.

[0023] The water-absorbing resin particles of this application can absorb and retain water in the soil, reduce the evaporation of soil moisture, improve the water retention of the soil, and expand after absorbing water, which facilitates the dispersion of soil nutrient regulators in the soil, gradually releasing the nutrients and plant growth regulators therein, and promoting the growth of crops.

[0024] The adsorbent filler of this application is prepared by sintering and has a porous structure. It can adsorb microorganisms, improve soil structure, increase soil permeability, and benefit the respiration and growth of plant roots.

[0025] The monosodium glutamate (MSG) of this application can combine with calcium ions in the soil to form calcium glutamate. This compound can promote the coagulation of soil colloids, making the soil loose and breathable, which is beneficial to the growth of crop roots. At the same time, MSG can also promote the reproduction and activity of microorganisms in the soil, increase soil fertility, and provide sufficient nutrition for crops. Secondly, MSG can promote plant root development and chlorophyll synthesis, thereby accelerating plant growth. In addition, MSG can inhibit the reproduction of pathogens in the soil, reduce the risk of plant diseases, and prevent the occurrence of pests and diseases.

[0026] The indolebutyric acid (IBA) of this application is a root-promoting plant growth regulator. Its main functions are to promote cell elongation, induce and promote cell differentiation, control apical dominance, promote the generation of lateral and adventitious roots, regulate flowering and sex differentiation, and regulate fruit setting and fruit development. S-inducer has the ability to promote the balanced absorption of water and fertilizer by plants and coordinate metabolism. It can effectively regulate the root / crown and vegetative and reproductive growth of plants, improve the quality and yield of crops, and effectively activate the plant's stress-resistant immune system, thus strengthening the plant's overall resistance. Naphthaleneacetic acid (NAA) promotes root growth, significantly stimulates plant growth, promotes root development, and increases germination rate. It can also effectively prevent flower and fruit drop, increase fruit setting rate, and reduce the production of ethylene in plants, thereby delaying senescence, making plants stronger, and improving the yield and quality of crops.

[0027] The organic fermentation broth of this application contains rich nutrients and various trace elements. At the same time, it serves as a carrier for monosodium glutamate and plant growth regulators, making it easier for the plant growth regulators to disperse evenly and avoiding excessively high local concentrations that could affect crop growth.

[0028] In this application, volcanic mud is compounded with activated carbon powder and Al2O3 powder. This fully utilizes the electrostatic attraction effect of volcanic mud, the porous flocculation effect of Al2O3, and the adsorption effect of activated carbon, facilitating the attachment of microorganisms to the packing surface and enhancing their biological activity. Carboxyethyl cellulose in the composite powder acts as a binder; its combination with a silane coupling agent improves the interfacial bonding between activated carbon and Al2O3, making them less prone to separation during subsequent granulation. Al2O3 enhances microbial activity and facilitates oxygen accumulation on the packing surface, thus promoting microbial aggregation. Activated carbon enhances adsorption strength. The combination of these two components creates favorable conditions for microbial reproduction, improves the density of the biofilm, and ultimately increases the efficiency of soil pollutant treatment.

[0029] In the preparation of sulfonated modified lignin in this application, the reaction temperature, reaction time, and amount of Na2SO3 are all carefully set. If the reaction temperature is too high, it may lead to lignin degradation, while excessive Na2SO3 may increase costs and reduce the purity of the product.

[0030] According to some embodiments of this application, the weight ratio of Al2O3 powder to volcanic mud and activated carbon powder in step B1 is (1-3):1:1.

[0031] According to some embodiments of this application, the particle size of the particles in step B3 is 2-4 mm.

[0032] According to some embodiments of this application, the particle size of the zeolite particles in step B3 is 1-2 mm.

[0033] According to some embodiments of this application, the method for preparing the organic fermentation broth includes the following steps:

[0034] A1. Starting materials, including the following components in parts by weight: 100-200 parts manure, 30-50 parts berries, 10-15 parts garlic stalks, 8-12 parts chili stalks, 10-15 parts tobacco stalks, 10-15 parts peach leaves, 12-18 parts locust leaves, 12-18 parts neem leaves, 5-10 parts cosmos, and 4-8 parts morning glory.

[0035] A2. Add a compound microbial strain to the starting material, wherein the amount of the compound microbial strain added is 0.6-1.2% of the weight of the starting material;

[0036] A3. Add a fermentation function enhancer, wherein the fermentation function enhancer comprises the following components in parts by weight: 50-90 parts of bio-humic acid from kitchen fermentation, 5-10 parts of quicklime, 0.01-0.1 parts of polyaspartic acid, 6-12 parts of vermiculite powder, 2-5 parts of zeolite powder, and 10-15 parts of nitration inhibitor.

[0037] A4. Backmixing: Fermentation includes the initial, middle and late stages. The material from the middle stage (3-5 days) is backmixed, with the backmixing amount being 10-30% of the initial material. The fermented material is then filtered to obtain the organic fermentation liquid.

[0038] Garlic stalks are rich in nutrients such as protein, fat, carbohydrates, and niacin. After fermentation, they can supplement the nutrients needed by plants and also have a certain antibacterial effect, enhancing the plant's resistance to diseases and bacteria. Chili stalks are pungent and hot in nature, which can enhance the plant's resistance to diseases and pests. Tobacco stalks are rich in organic matter and nutrients such as nitrogen, phosphorus, and potassium. After fermentation, they can degrade into organic matter, which can not only improve soil structure and increase soil fertility, but also promote crop growth and increase yield and quality. Peach leaves have the effects of clearing heat and detoxifying, killing insects and relieving itching, which can enhance the plant's resistance to diseases and pests. Locust leaves contain a large amount of organic matter and elements such as nitrogen, phosphorus, and potassium, and are rich in nutrients, which can increase soil fertility and improve soil structure. Chinaberry leaves contain abundant organic matter, which can provide sufficient nutrients and is conducive to plant growth. When fermented, they can improve soil structure and enhance soil fertility. Cosmos can repel various moths and insects. Rosemary can repel diamondback moths, carrot flies, bean beetles, etc. Morning glories attract hoverflies and protect the plants that depend on them from aphid damage.

[0039] Furthermore, before mixing, the garlic stalks, chili stalks, tobacco stalks, peach leaves, locust leaves, neem leaves, cosmos, and morning glory flowers are all washed, chopped, dried, crushed, and sieved through a 1-10 mesh sieve.

[0040] Furthermore, the berries mentioned in step A1 include at least one of apples, citrus fruits, pears, dates, persimmons, grapes, and watermelons.

[0041] Furthermore, the berries include citrus fruits, dates, and watermelons in a weight ratio of (0.5-2):(0.5-2):1. Dates contain various vitamins, minerals, amino acids, and other components, which are suitable for plant growth and can be used to make fermentation liquid, thereby improving fertilizer efficiency.

[0042] Further, the compound microbial strain mentioned in step A2 includes at least one of actinomycetes, yeasts, Bacillus subtilis, white-rot fungi, nitrogen-fixing bacteria, phosphate-solubilizing bacteria, potassium-solubilizing bacteria, and lactic acid bacteria.

[0043] Furthermore, the compound microbial strain is composed of actinomycetes, yeasts, Bacillus subtilis, white-rot fungi, and nitrogen-fixing bacteria in a weight ratio of (1-2):(1-3):(1-4):(1-4):(1-4).

[0044] According to some embodiments of this application, the method for preparing the water-absorbing resin includes the following steps:

[0045] Mix 40-50 parts of acrylamide, 4-8 parts of acrylic acid, 0.4-0.6 parts of potassium persulfate, and 0.02-0.03 parts of methylenebisacrylamide, then add 0.1-0.2 parts of N,N,N',N'-tetramethylethylenediamine dropwise, mix thoroughly, and react for 1-3 hours. Dry the resulting gel polymer and then pulverize it into resin particles. Use sodium hexadecyl diphenyl ether disulfonate to perform pressurized spray treatment on the resin particles to obtain a water-absorbing resin, wherein the amount of sodium hexadecyl diphenyl ether disulfonate is 1-2 wt% of the resin particles.

[0046] Furthermore, the reaction temperature is 5-30°C, for example, the reaction temperature is 20°C.

[0047] Furthermore, the average particle size of the resin particles is 0.05-0.1 mm, for example, the average particle size of the resin particles is 0.05 mm.

[0048] Secondly, this application provides a method for preparing the above-mentioned soil nutrient regulator for crop cultivation, which is achieved through the following technical solution:

[0049] The preparation method of the above-mentioned soil nutrient conditioner for crop cultivation includes the following steps:

[0050] (1) Mix at least one of indolebutyric acid, naphthaleneacetic acid or S-inducer with organic fermentation broth, sodium glutamate and adsorbent packing material according to the weight parts, and fully adsorb;

[0051] (2) Add the water-absorbing resin according to the weight parts, mix evenly, and then evenly sprinkle the adhesive on the surface of the mixed raw materials to obtain the soil nutrient conditioner precursor.

[0052] (3) The soil nutrient regulator precursor described in step (2) is extruded and granulated. The granulation conditions are adjusted so that the particle size is controlled at 3-5 mm. Then it is dried to obtain the soil nutrient regulator.

[0053] The method for preparing a soil nutrient conditioner for crop cultivation according to the embodiments of this application has at least the following beneficial effects:

[0054] The preparation method of this application is simple. By mixing organic fermentation broth, plant growth regulators, monosodium glutamate, and adsorbent filler, some nutrients are adsorbed into the interior by the adsorbent filler, which can slow down the release rate of nutrients and plant growth regulators in the organic fermentation broth. A water-absorbing resin is mixed with other raw materials through an adhesive. The adhesive is water-soluble, and the water-absorbing resin particles swell after absorbing water, which facilitates the dispersion of soil nutrient regulators in the soil and gradually releases the nutrients and plant growth regulators to promote crop growth. At the same time, the preparation method of this application does not require complex production equipment, has low cost, and the manufacturing process is pollution-free, with no toxic emissions, and does not harm the health of operators, making it suitable for industrial production. Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of this application clearer, a further detailed description will be provided below in conjunction with specific embodiments. The embodiments described herein are merely some examples of this application and should not be construed as limiting the scope of protection of this application.

[0056] Example 1

[0057] Preparation of soil nutrient conditioners for crop cultivation:

[0058] (1) Preparation of organic fermentation broth:

[0059] A1. Starting materials, comprising the following components by weight: 150 parts manure, 40 parts berries, 12 parts garlic stalks, 10 parts chili stalks, 13 parts tobacco stalks, 12 parts peach leaves, 16 parts locust leaves, 14 parts neem leaves, 7 parts cosmos, and 6 parts morning glory; wherein, the berries are a mixture of citrus, jujube, and watermelon in a weight ratio of 1.2:1.5:1; the garlic stalks, chili stalks, tobacco stalks, peach leaves, locust leaves, neem leaves, cosmos, and morning glory are all washed, chopped, dried, crushed, and sieved through a 1-10 mesh sieve before mixing;

[0060] A2. Add a compound microbial strain to the starting material, wherein the amount of the compound microbial strain added is 1% of the weight of the starting material; the compound microbial strain is composed of actinomycetes, yeast, Bacillus subtilis, white-rot fungi, and nitrogen-fixing bacteria in a weight ratio of 2:2:3:2:3.

[0061] A3. Add a fermentation function enhancer, wherein the fermentation function enhancer comprises the following components in parts by weight: 70 parts of bio-humic acid from kitchen fermentation, 8 parts of quicklime, 0.05 parts of polyaspartic acid, 9 parts of vermiculite powder, 4 parts of zeolite powder, and 12 parts of nitrification inhibitor.

[0062] A4. Backmixing: Fermentation includes the initial, middle and late stages. Backmix the material from the middle stage (3-5 days) with a backmixing amount of 20% of the initial material. Filter the fermented material to obtain organic fermentation liquid.

[0063] (2) Preparation of adsorbent packing material:

[0064] B1. Add volcanic mud, Al2O3 powder, and activated carbon powder to an aqueous solution of γ-glycidoxypropyltrimethoxysilane in a weight ratio of 2:1:1, sonicate and stir to prepare a suspension.

[0065] B2. Carboxyethyl cellulose is added to the suspension to form a slurry, which is then dried and ground to produce a composite powder.

[0066] B3. Weigh 35 parts by weight of zeolite particles with a particle size of 1-2 mm, 25 parts by weight of coal gangue powder, 35 parts by weight of clay, 6 parts by weight of ammonium bicarbonate, and 42 parts by weight of the composite powder, mix them evenly, add 30 parts by weight of water, granulate, and make particles with a particle size of 2-4 mm.

[0067] B4. The particles are preheated to 110°C, then calcined at 650°C and cooled to produce an adsorbent filler.

[0068] (3) Preparation of water-absorbing resin:

[0069] 45 parts acrylamide, 6 parts acrylic acid, 0.5 parts potassium persulfate, and 0.02 parts methylenebisacrylamide were mixed, and 0.15 parts N,N,N',N'-tetramethylethylenediamine were added dropwise. The mixture was stirred until homogeneous and reacted at 20°C for 2 hours. The resulting gel polymer was dried and then pulverized into resin particles with an average particle size of 0.05 mm. The resin particles were subjected to pressurized spray treatment with sodium hexadecyl diphenyl ether disulfonate to obtain a water-absorbing resin. The amount of sodium hexadecyl diphenyl ether disulfonate used was 1.5 wt% of the resin particles.

[0070] (4) Preparation of sulfonated modified lignin:

[0071] Lignin and Na2SO3 were mixed evenly at a weight ratio of 4:2.5, and a 15% NaOH solution was added. The mixture was reacted at 180℃ for 4 hours to obtain sulfonated modified lignin.

[0072] (5) Mix 30 parts of organic fermentation broth, 0.5 parts of indolebutyric acid, 0.5 parts of naphthaleneacetic acid, 0.1 parts of S-inducer, 2 parts of sodium glutamate and 40 parts of adsorbent filler according to the weight ratio, and allow to fully adsorb;

[0073] (6) Add 12 parts of water-absorbing resin according to the weight ratio, mix evenly, and then evenly sprinkle 13 parts of adhesive on the surface of the mixed raw materials to obtain the soil nutrient regulator precursor; wherein the adhesive is composed of polylactic acid, sulfonated modified lignin, polyvinyl alcohol, and γ-glycidyl etheroxypropyltrimethoxysilane in a weight ratio of 12:7:4:1.

[0074] (7) The soil nutrient regulator precursor described in step (6) is extruded and granulated. The granulation conditions are adjusted so that the particle size is controlled at 4 mm. Then, it is dried to obtain the soil nutrient regulator.

[0075] Example 2

[0076] Preparation of soil nutrient conditioners for crop cultivation:

[0077] (1) Preparation of organic fermentation broth:

[0078] A1. Starting materials, comprising the following components by weight: 100 parts manure, 50 parts berries, 10 parts garlic stalks, 12 parts chili stalks, 10 parts tobacco stalks, 15 parts peach leaves, 12 parts locust leaves, 18 parts neem leaves, 5 parts cosmos, and 8 parts morning glory; wherein, the berries are a mixture of citrus, jujube, and watermelon in a weight ratio of 0.5:2:1; the garlic stalks, chili stalks, tobacco stalks, peach leaves, locust leaves, neem leaves, cosmos, and morning glory are all washed, chopped, dried, crushed, and sieved through a 1-10 mesh sieve before mixing;

[0079] A2. Add a compound microbial strain to the starting material, wherein the amount of the compound microbial strain added is 0.6% of the weight of the starting material; the compound microbial strain is composed of actinomycetes, yeast, Bacillus subtilis, white rot fungi, and nitrogen-fixing bacteria in a weight ratio of 2:1:4:1:4.

[0080] A3. Add a fermentation function enhancer, wherein the fermentation function enhancer comprises the following components in parts by weight: 50 parts of bio-humic acid from kitchen fermentation, 10 parts of quicklime, 0.01 parts of polyaspartic acid, 12 parts of vermiculite powder, 2 parts of zeolite powder, and 15 parts of nitrification inhibitor.

[0081] A4. Backmixing: Fermentation includes the initial, middle and late stages. The material from the middle stage of fermentation (3-5 days) is backmixed, with the backmixing amount being 10% of the initial material. The fermented material is then filtered to obtain the organic fermentation liquid.

[0082] (2) Preparation of adsorbent packing material:

[0083] B1. Add volcanic mud, Al2O3 powder, and activated carbon powder to an aqueous solution of γ-glycidoxypropyltrimethoxysilane in a weight ratio of 3:1:1, sonicate and stir to prepare a suspension.

[0084] B2. Carboxyethyl cellulose is added to the suspension to form a slurry, which is then dried and ground to produce a composite powder.

[0085] B3. Weigh 30 parts by weight of zeolite particles with a particle size of 1-2 mm, 30 parts by weight of coal gangue powder, 30 parts by weight of clay, 8 parts by weight of ammonium bicarbonate, and 35 parts by weight of the composite powder. Mix them evenly, add 35 parts by weight of water, granulate, and make particles with a particle size of 2-4 mm.

[0086] B4. The particles are preheated to 105°C, then calcined at 700°C and cooled to produce an adsorbent filler.

[0087] (3) Preparation of water-absorbing resin:

[0088] 40 parts acrylamide, 8 parts acrylic acid, 0.4 parts potassium persulfate, and 0.03 parts methylenebisacrylamide were mixed, and 0.1 parts N,N,N',N'-tetramethylethylenediamine was added dropwise. The mixture was stirred until homogeneous and reacted at 30°C for 1 hour. The resulting gel polymer was dried and then pulverized into resin particles with an average particle size of 0.1 mm. The resin particles were subjected to pressurized spray treatment with sodium hexadecyl diphenyl ether disulfonate to obtain a water-absorbing resin. The amount of sodium hexadecyl diphenyl ether disulfonate used was 1 wt% of the resin particles.

[0089] (4) Preparation of sulfonated modified lignin:

[0090] Lignin and Na2SO3 were mixed evenly at a weight ratio of 5:2, and a 15% NaOH solution was added. The mixture was reacted at 200℃ for 3 hours to obtain sulfonated modified lignin.

[0091] (5) Mix 40 parts of organic fermentation broth, 0.01 parts of indolebutyric acid, 2 parts of naphthaleneacetic acid, 0.001 parts of S-inducer, 3 parts of sodium glutamate and 30 parts of adsorbent filler according to the weight ratio, and fully adsorb;

[0092] (6) Add 10 parts of water-absorbing resin according to the weight ratio, mix evenly, and then evenly sprinkle 15 parts of adhesive on the surface of the mixed raw materials to obtain the soil nutrient regulator precursor; wherein the adhesive is composed of polylactic acid, sulfonated modified lignin, polyvinyl alcohol, and γ-glycidyl etheroxypropyltrimethoxysilane in a weight ratio of 10:8:3:2.

[0093] (7) The soil nutrient regulator precursor described in step (6) is extruded and granulated. The granulation conditions are adjusted so that the particle size is controlled at 3 mm. Then, it is dried to obtain the soil nutrient regulator.

[0094] Example 3

[0095] Preparation of soil nutrient conditioners for crop cultivation:

[0096] (1) Preparation of organic fermentation broth:

[0097] A1. Starting materials, comprising the following components by weight: 200 parts manure, 30 parts berries, 15 parts garlic stalks, 8 parts chili stalks, 15 parts tobacco stalks, 10 parts peach leaves, 18 parts locust leaves, 12 parts neem leaves, 10 parts cosmos, and 4 parts morning glory; wherein, the berries are a mixture of citrus, jujube, and watermelon in a weight ratio of 2:0.5:1; the garlic stalks, chili stalks, tobacco stalks, peach leaves, locust leaves, neem leaves, cosmos, and morning glory are all washed, chopped, dried, crushed, and sieved through a 1-10 mesh sieve before mixing;

[0098] A2. Add a compound microbial strain to the starting material, wherein the amount of the compound microbial strain added is 1.2% of the weight of the starting material; the compound microbial strain is composed of actinomycetes, yeast, Bacillus subtilis, white rot fungi, and nitrogen-fixing bacteria in a weight ratio of 1:3:1:4:1.

[0099] A3. Add a fermentation function enhancer, wherein the fermentation function enhancer comprises the following components in parts by weight: 90 parts of bio-humic acid from kitchen fermentation, 5 parts of quicklime, 0.1 parts of polyaspartic acid, 6 parts of vermiculite powder, 5 parts of zeolite powder, and 10 parts of nitration inhibitor.

[0100] A4. Backmixing: Fermentation includes the initial, middle and late stages. The material from the middle stage of fermentation (3-5 days) is backmixed, with the backmixing amount being 30% of the initial material. The fermented material is then filtered to obtain the organic fermentation liquid.

[0101] (2) Preparation of adsorbent packing material:

[0102] B1. Add volcanic mud, Al2O3 powder, and activated carbon powder to an aqueous solution of γ-glycidoxypropyltrimethoxysilane in a weight ratio of 1:1:1, sonicate and stir to prepare a suspension.

[0103] B2. Carboxyethyl cellulose is added to the suspension to form a slurry, which is then dried and ground to produce a composite powder.

[0104] B3. Weigh 40 parts by weight of zeolite particles with a particle size of 1-2 mm, 20 parts by weight of coal gangue powder, 40 parts by weight of clay, 4 parts by weight of ammonium bicarbonate, and 50 parts by weight of the composite powder, mix them evenly, add 25 parts by weight of water, granulate, and make particles with a particle size of 2-4 mm.

[0105] B4. The particles are preheated to 115°C, then calcined at 500°C and cooled to produce an adsorbent filler.

[0106] (3) Preparation of water-absorbing resin:

[0107] 50 parts acrylamide, 4 parts acrylic acid, 0.6 parts potassium persulfate, and 0.02 parts methylenebisacrylamide were mixed, and 0.2 parts N,N,N',N'-tetramethylethylenediamine were added dropwise. The mixture was stirred until homogeneous and reacted at 5°C for 3 hours. The resulting gel polymer was dried and then pulverized into resin particles with an average particle size of 0.05 mm. The resin particles were subjected to pressurized spray treatment with sodium hexadecyl diphenyl ether disulfonate to obtain a water-absorbing resin. The amount of sodium hexadecyl diphenyl ether disulfonate used was 2 wt% of the resin particles.

[0108] (4) Preparation of sulfonated modified lignin:

[0109] Lignin and Na2SO3 were mixed evenly at a weight ratio of 3:3, and a 15% NaOH solution was added. The mixture was reacted at 150℃ for 5 hours to obtain sulfonated modified lignin.

[0110] (5) Mix 20 parts of organic fermentation broth, 2 parts of indolebutyric acid, 0.01 parts of naphthaleneacetic acid, 0.5 parts of S-inducer, 1 part of sodium glutamate, and 50 parts of adsorbent filler according to the weight ratio, and allow to fully adsorb;

[0111] (6) Add 15 parts of water-absorbing resin according to the weight ratio, mix evenly, and then evenly sprinkle 10 parts of adhesive on the surface of the mixed raw materials to obtain the soil nutrient regulator precursor; wherein the adhesive is composed of polylactic acid, sulfonated modified lignin, polyvinyl alcohol, and γ-glycidyl etheroxypropyltrimethoxysilane in a weight ratio of 15:5:5:0.5.

[0112] (7) The soil nutrient regulator precursor described in step (6) is extruded and granulated. The granulation conditions are adjusted so that the particle size is controlled at 5 mm. Then, it is dried to obtain the soil nutrient regulator.

[0113] Example 4

[0114] Preparation of soil nutrient conditioners for crop cultivation:

[0115] (1) Preparation of organic fermentation broth:

[0116] A1. Starting materials, comprising the following components by weight: 180 parts manure, 40 parts berries, 15 parts garlic stalks, 8 parts chili stalks, 13 parts tobacco stalks, 11 parts peach leaves, 16 parts locust leaves, 17 parts neem leaves, 6 parts cosmos, and 7 parts morning glory; wherein, the berries are a mixture of citrus, jujube, and watermelon in a weight ratio of 1:1.4:1; the garlic stalks, chili stalks, tobacco stalks, peach leaves, locust leaves, neem leaves, cosmos, and morning glory are all washed, chopped, dried, crushed, and sieved through a 1-10 mesh sieve before mixing;

[0117] A2. Add a compound microbial strain to the starting material, wherein the amount of the compound microbial strain added is 0.8% of the weight of the starting material; the compound microbial strain is composed of actinomycetes, yeast, Bacillus subtilis, white rot fungi, and nitrogen-fixing bacteria in a weight ratio of 1.5:2:1.2:2.6:3.5.

[0118] A3. Add a fermentation function enhancer, wherein the fermentation function enhancer comprises the following components in parts by weight: 80 parts of bio-humic acid from kitchen fermentation, 7 parts of quicklime, 0.06 parts of polyaspartic acid, 8 parts of vermiculite powder, 3 parts of zeolite powder, and 13 parts of nitrification inhibitor.

[0119] A4. Backmixing: Fermentation includes the initial, middle and late stages. Backmix the material from the middle stage (3-5 days) of fermentation, with the backmixing amount being 15% of the initial material. Filter the fermented material to obtain the organic fermentation liquid.

[0120] (2) Preparation of adsorbent packing material:

[0121] B1. Add volcanic mud, Al2O3 powder, and activated carbon powder to an aqueous solution of γ-glycidoxypropyltrimethoxysilane in a weight ratio of 2:1:1, sonicate and stir to prepare a suspension.

[0122] B2. Carboxyethyl cellulose is added to the suspension to form a slurry, which is then dried and ground to produce a composite powder.

[0123] B3. Weigh 35 parts by weight of zeolite particles with a particle size of 1-2 mm, 25 parts by weight of coal gangue powder, 36 parts by weight of clay, 5 parts by weight of ammonium bicarbonate, and 40 parts by weight of the composite powder. Mix them evenly, add 30 parts by weight of water, granulate, and make particles with a particle size of 2-4 mm.

[0124] B4. The particles are preheated to 112°C, then calcined at 650°C and cooled to produce an adsorbent filler.

[0125] (3) Preparation of water-absorbing resin:

[0126] 45 parts acrylamide, 6 parts acrylic acid, 0.5 parts potassium persulfate, and 0.03 parts methylenebisacrylamide were mixed, and 0.15 parts N,N,N',N'-tetramethylethylenediamine were added dropwise. The mixture was stirred until homogeneous and reacted at 15°C for 2 hours. The resulting gel polymer was dried and then pulverized into resin particles with an average particle size of 0.07 mm. The resin particles were subjected to pressurized spray treatment with sodium hexadecyl diphenyl ether disulfonate to obtain a water-absorbing resin. The amount of sodium hexadecyl diphenyl ether disulfonate used was 1.6 wt% of the resin particles.

[0127] (4) Preparation of sulfonated modified lignin:

[0128] Lignin and Na2SO3 were mixed evenly at a weight ratio of 5:3, and a 15% NaOH solution was added. The mixture was reacted at 170℃ for 4 hours to obtain sulfonated modified lignin.

[0129] (5) Mix 30 parts of organic fermentation broth, 1 part of indolebutyric acid, 2 parts of sodium glutamate and 40 parts of adsorbent filler according to the weight parts, and fully adsorb;

[0130] (6) Add 12 parts of water-absorbing resin according to the weight ratio, mix evenly, and then evenly sprinkle 13 parts of adhesive on the surface of the mixed raw materials to obtain the soil nutrient regulator precursor; wherein the adhesive is composed of polylactic acid, sulfonated modified lignin, polyvinyl alcohol, and γ-glycidyl etheroxypropyltrimethoxysilane in a weight ratio of 11:6:4:1.

[0131] (7) The soil nutrient regulator precursor described in step (6) is extruded and granulated. The granulation conditions are adjusted so that the particle size is controlled at 4 mm. Then, it is dried to obtain the soil nutrient regulator.

[0132] Comparative Example 1

[0133] Preparation of soil nutrient conditioners for crop cultivation:

[0134] (1) Preparation of organic fermentation broth:

[0135] A1. Starting materials, comprising the following components by weight: 150 parts manure, 40 parts berries, 12 parts garlic stalks, 10 parts chili stalks, 13 parts tobacco stalks, 12 parts peach leaves, 16 parts locust leaves, 14 parts neem leaves, 7 parts cosmos, and 6 parts morning glory; wherein, the berries are a mixture of citrus, jujube, and watermelon in a weight ratio of 1.2:1.5:1; the garlic stalks, chili stalks, tobacco stalks, peach leaves, locust leaves, neem leaves, cosmos, and morning glory are all washed, chopped, dried, crushed, and sieved through a 1-10 mesh sieve before mixing;

[0136] A2. Add a compound microbial strain to the starting material, wherein the amount of the compound microbial strain added is 1% of the weight of the starting material; the compound microbial strain is composed of actinomycetes, yeast, Bacillus subtilis, white-rot fungi, and nitrogen-fixing bacteria in a weight ratio of 2:2:3:2:3.

[0137] A3. Add a fermentation function enhancer, wherein the fermentation function enhancer comprises the following components in parts by weight: 70 parts of bio-humic acid from kitchen fermentation, 8 parts of quicklime, 0.05 parts of polyaspartic acid, 9 parts of vermiculite powder, 4 parts of zeolite powder, and 12 parts of nitrification inhibitor.

[0138] A4. Backmixing: Fermentation includes the initial, middle and late stages. Backmix the material from the middle stage (3-5 days) with a backmixing amount of 20% of the initial material. Filter the fermented material to obtain organic fermentation liquid.

[0139] (2) Preparation of adsorbent packing material:

[0140] B1. Add activated carbon powder to an aqueous solution of γ-glycidoxypropyltrimethoxysilane, sonicate and stir to prepare a suspension;

[0141] B2. Carboxyethyl cellulose is added to the suspension to form a slurry, which is then dried and ground to produce a composite powder.

[0142] B3. Weigh 35 parts by weight of zeolite particles with a particle size of 1-2 mm, 25 parts by weight of coal gangue powder, 35 parts by weight of clay, 6 parts by weight of ammonium bicarbonate, and 42 parts by weight of the composite powder, mix them evenly, add 30 parts by weight of water, granulate, and make particles with a particle size of 2-4 mm.

[0143] B4. The particles are preheated to 110°C, then calcined at 650°C and cooled to produce an adsorbent filler.

[0144] (3) Preparation of water-absorbing resin:

[0145] 45 parts acrylamide, 6 parts acrylic acid, 0.5 parts potassium persulfate, and 0.02 parts methylenebisacrylamide were mixed, and 0.15 parts N,N,N',N'-tetramethylethylenediamine were added dropwise. The mixture was stirred until homogeneous and reacted at 20°C for 2 hours. The resulting gel polymer was dried and then pulverized into resin particles with an average particle size of 0.05 mm. The resin particles were subjected to pressurized spray treatment with sodium hexadecyl diphenyl ether disulfonate to obtain a water-absorbing resin. The amount of sodium hexadecyl diphenyl ether disulfonate used was 1.5 wt% of the resin particles.

[0146] (4) Preparation of sulfonated modified lignin:

[0147] Lignin and Na2SO3 were mixed evenly at a weight ratio of 4:2.5, and a 15% NaOH solution was added. The mixture was reacted at 180℃ for 4 hours to obtain sulfonated modified lignin.

[0148] (5) Mix 30 parts of organic fermentation broth, 0.5 parts of indolebutyric acid, 0.5 parts of naphthaleneacetic acid, 0.1 parts of S-inducer, 2 parts of sodium glutamate and 40 parts of adsorbent filler according to the weight ratio, and allow to fully adsorb;

[0149] (6) Add 12 parts of water-absorbing resin according to the weight ratio, mix evenly, and then evenly sprinkle 13 parts of adhesive on the surface of the mixed raw materials to obtain the soil nutrient regulator precursor; wherein the adhesive is composed of polylactic acid, sulfonated modified lignin, polyvinyl alcohol, and γ-glycidyl etheroxypropyltrimethoxysilane in a weight ratio of 12:7:4:1.

[0150] (7) The soil nutrient regulator precursor described in step (6) is extruded and granulated. The granulation conditions are adjusted so that the particle size is controlled at 4 mm. Then, it is dried to obtain the soil nutrient regulator.

[0151] Comparative Example 2

[0152] Preparation of soil nutrient conditioners for crop cultivation:

[0153] (1) Preparation of organic fermentation broth:

[0154] A1. Starting materials, comprising the following components by weight: 150 parts manure, 40 parts berries, 12 parts garlic stalks, 10 parts chili stalks, 13 parts tobacco stalks, 12 parts peach leaves, 16 parts locust leaves, 14 parts neem leaves, 7 parts cosmos, and 6 parts morning glory; wherein, the berries are a mixture of citrus, jujube, and watermelon in a weight ratio of 1.2:1.5:1; the garlic stalks, chili stalks, tobacco stalks, peach leaves, locust leaves, neem leaves, cosmos, and morning glory are all washed, chopped, dried, crushed, and sieved through a 1-10 mesh sieve before mixing;

[0155] A2. Add a compound microbial strain to the starting material, wherein the amount of the compound microbial strain added is 1% of the weight of the starting material; the compound microbial strain is composed of actinomycetes, yeast, Bacillus subtilis, white-rot fungi, and nitrogen-fixing bacteria in a weight ratio of 2:2:3:2:3.

[0156] A3. Add a fermentation function enhancer, wherein the fermentation function enhancer comprises the following components in parts by weight: 70 parts of bio-humic acid from kitchen fermentation, 8 parts of quicklime, 0.05 parts of polyaspartic acid, 9 parts of vermiculite powder, 4 parts of zeolite powder, and 12 parts of nitrification inhibitor.

[0157] A4. Backmixing: Fermentation includes the initial, middle and late stages. Backmix the material from the middle stage (3-5 days) with a backmixing amount of 20% of the initial material. Filter the fermented material to obtain organic fermentation liquid.

[0158] (2) Preparation of adsorbent packing material:

[0159] B1. Add volcanic mud, Al2O3 powder, and activated carbon powder to an aqueous solution of γ-glycidoxypropyltrimethoxysilane in a weight ratio of 2:1:1, sonicate and stir to prepare a suspension.

[0160] B2. Carboxyethyl cellulose is added to the suspension to form a slurry, which is then dried and ground to produce a composite powder.

[0161] B3. Weigh 35 parts by weight of zeolite particles with a particle size of 1-2 mm, 25 parts by weight of coal gangue powder, 35 parts by weight of clay, 6 parts by weight of ammonium bicarbonate, and 42 parts by weight of the composite powder, mix them evenly, add 30 parts by weight of water, granulate, and make particles with a particle size of 2-4 mm.

[0162] B4. The particles are preheated to 110°C, then calcined at 650°C and cooled to produce an adsorbent filler.

[0163] (3) Preparation of water-absorbing resin:

[0164] 45 parts acrylamide, 6 parts acrylic acid, 0.5 parts potassium persulfate, and 0.02 parts methylenebisacrylamide were mixed, and 0.15 parts N,N,N',N'-tetramethylethylenediamine were added dropwise. The mixture was stirred until homogeneous and reacted at 20°C for 2 hours. The resulting gel polymer was dried and then pulverized into resin particles with an average particle size of 0.05 mm. The resin particles were subjected to pressurized spray treatment with sodium hexadecyl diphenyl ether disulfonate to obtain a water-absorbing resin. The amount of sodium hexadecyl diphenyl ether disulfonate used was 1.5 wt% of the resin particles.

[0165] (4) Mix 30 parts of organic fermentation broth, 0.5 parts of indolebutyric acid, 0.5 parts of naphthaleneacetic acid, 0.1 parts of S-inducer, 2 parts of sodium glutamate and 40 parts of adsorbent filler according to the weight ratio, and fully adsorb;

[0166] (5) Add 12 parts of water-absorbing resin according to the weight ratio, mix evenly, and then evenly sprinkle 13 parts of adhesive on the surface of the mixed raw materials to obtain the soil nutrient conditioner precursor; wherein the adhesive is composed of polylactic acid, polyvinyl alcohol and γ-glycidoxypropyltrimethoxysilane in a weight ratio of 12:4:1.

[0167] (6) The soil nutrient regulator precursor described in step (5) is extruded and granulated. The granulation conditions are adjusted so that the particle size is controlled at 4 mm. Then, it is dried to obtain the soil nutrient regulator.

[0168] Comparative Example 3

[0169] Preparation of soil nutrient conditioners for crop cultivation:

[0170] (1) Preparation of organic fermentation broth:

[0171] A1. Starting materials, comprising the following components by weight: 150 parts manure, 40 parts berries, 12 parts garlic stalks, 10 parts chili stalks, 13 parts tobacco stalks, 12 parts peach leaves, 16 parts locust leaves, 14 parts neem leaves, 7 parts cosmos, and 6 parts morning glory; wherein, the berries are a mixture of citrus, jujube, and watermelon in a weight ratio of 1.2:1.5:1; the garlic stalks, chili stalks, tobacco stalks, peach leaves, locust leaves, neem leaves, cosmos, and morning glory are all washed, chopped, dried, crushed, and sieved through a 1-10 mesh sieve before mixing;

[0172] A2. Add a compound microbial strain to the starting material, wherein the amount of the compound microbial strain added is 1% of the weight of the starting material; the compound microbial strain is composed of actinomycetes, yeast, Bacillus subtilis, white-rot fungi, and nitrogen-fixing bacteria in a weight ratio of 2:2:3:2:3.

[0173] A3. Add a fermentation function enhancer, wherein the fermentation function enhancer comprises the following components in parts by weight: 70 parts of bio-humic acid from kitchen fermentation, 8 parts of quicklime, 0.05 parts of polyaspartic acid, 9 parts of vermiculite powder, 4 parts of zeolite powder, and 12 parts of nitrification inhibitor.

[0174] A4. Backmixing: Fermentation includes the initial, middle and late stages. Backmix the material from the middle stage (3-5 days) with a backmixing amount of 20% of the initial material. Filter the fermented material to obtain organic fermentation liquid.

[0175] (2) Preparation of adsorbent packing material:

[0176] B1. Add volcanic mud, Al2O3 powder, and activated carbon powder to an aqueous solution of γ-glycidoxypropyltrimethoxysilane in a weight ratio of 2:1:1, sonicate and stir to prepare a suspension.

[0177] B2. Carboxyethyl cellulose is added to the suspension to form a slurry, which is then dried and ground to produce a composite powder.

[0178] B3. Weigh 35 parts by weight of zeolite particles with a particle size of 1-2 mm, 25 parts by weight of coal gangue powder, 35 parts by weight of clay, 6 parts by weight of ammonium bicarbonate, and 42 parts by weight of the composite powder, mix them evenly, add 30 parts by weight of water, granulate, and make particles with a particle size of 2-4 mm.

[0179] B4. The particles are preheated to 110°C, then calcined at 650°C and cooled to produce an adsorbent filler.

[0180] (3) Preparation of water-absorbing resin:

[0181] 45 parts acrylamide, 6 parts acrylic acid, 0.5 parts potassium persulfate, and 0.02 parts methylenebisacrylamide were mixed, and 0.15 parts N,N,N',N'-tetramethylethylenediamine were added dropwise. The mixture was stirred until homogeneous and reacted at 20°C for 2 hours. The resulting gel polymer was dried and then pulverized into resin particles with an average particle size of 0.05 mm. The resin particles were subjected to pressurized spray treatment with sodium hexadecyl diphenyl ether disulfonate to obtain a water-absorbing resin. The amount of sodium hexadecyl diphenyl ether disulfonate used was 1.5 wt% of the resin particles.

[0182] (4) Preparation of sulfonated modified lignin:

[0183] Lignin and Na2SO3 were mixed evenly at a weight ratio of 4:2.5, and a 15% NaOH solution was added. The mixture was reacted at 180℃ for 4 hours to obtain sulfonated modified lignin.

[0184] (5) Mix 30 parts of organic fermentation broth, 0.5 parts of indolebutyric acid, 0.5 parts of naphthaleneacetic acid, 0.1 parts of S-inducer and 40 parts of adsorption filler according to the weight ratio, and allow to fully adsorb;

[0185] (6) Add 12 parts of water-absorbing resin according to the weight ratio, mix evenly, and then evenly sprinkle 13 parts of adhesive on the surface of the mixed raw materials to obtain the soil nutrient regulator precursor; wherein the adhesive is composed of polylactic acid, sulfonated modified lignin, polyvinyl alcohol, and γ-glycidyl etheroxypropyltrimethoxysilane in a weight ratio of 12:7:4:1.

[0186] (7) The soil nutrient regulator precursor described in step (6) is extruded and granulated. The granulation conditions are adjusted so that the particle size is controlled at 4 mm. Then, it is dried to obtain the soil nutrient regulator.

[0187] Experimental Example

[0188] Soil nutrient regulators for crop cultivation prepared in Examples 1-4 and Comparative Examples 1-3 were applied to different plots of farmland in the same village. Tomato seedlings with similar growth conditions and a plant height of 5 cm were selected and planted in the aforementioned farmland treated with the soil nutrient regulators prepared in Examples 1-4 and Comparative Examples 1-3. Twenty tomato plants were planted in each plot. Watering was done weekly. Soil moisture content was measured before the last watering after four weeks, and plant height was measured after the last watering. The photosynthetic rate of leaves was measured using a portable photosynthesis meter at 13:00 the following day. Healthy leaves from similar parts of the plant were selected for testing. Simultaneously, the oxygen content in the soil was measured using a portable soil oxygen content meter, and the organic matter content in the soil of each plot was measured using the potassium dichromate titration method. The average values ​​of the measurement data for each plot of tomato were taken, and the results are shown in Table 1.

[0189] Table 1

[0190]

[0191] As can be seen from Table 1, after the soil nutrient regulators prepared in Examples 1-4 of this application for crop planting are applied to the soil, the soil contains rich nutrients, improves soil compaction, increases the oxygen content and water content in the soil, promotes the growth of tomato plants, and accelerates the photosynthetic rate of the plants.

[0192] In Comparative Example 1, the raw materials for preparing the adsorbent filler did not include volcanic mud and Al2O3 powder, but were otherwise identical to those in Example 1. The soil nutrient regulator prepared in Comparative Example 1 for crop cultivation showed significantly lower fertilizer efficiency than that of Example 1 of this application. The organic matter content in the soil was lower, and the oxygen content and water content in the soil also decreased. This indicates that the electrostatic attraction effect of volcanic mud, the porous flocculation effect of Al2O3, and the adsorption effect of activated carbon in the adsorbent filler of this application work together to facilitate the attachment of microorganisms to the interior of the filler and enhance their biological activity, thereby improving fertilizer efficiency, improving soil compaction, and promoting plant growth.

[0193] The adhesive of Comparative Example 2 did not use sulfonated modified lignin in its raw materials, and all other aspects were the same as in Example 1. The soil nutrient regulator prepared in Comparative Example 1 for crop planting had significantly lower fertilizer efficiency than that of Example 1 of this application. The organic matter content in the soil was lower, and the oxygen content and water content in the soil also decreased. This indicates that the lignin of this application has abundant active functional groups such as phenolic hydroxyl groups, which endow it with strong chemical reactivity and bonding properties. After sulfonation modification, the dispersibility and compatibility of lignin in polylactic acid emulsion are improved, which further enhances the bonding performance of the adhesive, thereby improving fertilizer efficiency and soil improvement effect.

[0194] Monosodium glutamate was not used in the preparation of Comparative Example 3, but all other materials were the same as in Example 1. The plant height and leaf photosynthetic rate of the soil nutrient regulator prepared in Comparative Example 1 for crop cultivation were significantly lower than those in Example 1 of this application, indicating that the monosodium glutamate of this application can combine with calcium ions in the soil to form calcium glutamate, promote soil colloid coagulation, make the soil loose and breathable, which is conducive to the growth of crop roots. At the same time, monosodium glutamate can also promote the reproduction and activity of microorganisms in the soil, increase soil fertility, provide sufficient nutrition for crops, promote plant root development and chlorophyll synthesis, thereby accelerating the growth rate of plants.

[0195] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions or alterations can be made to these embodiments without departing from the principles and spirit of this application, and the technical solutions resulting from such changes, modifications, substitutions or alterations will all fall within the protection scope of this application.

Claims

1. A soil nutrient conditioner for crop cultivation, characterized in that, The preparation materials include the following parts by weight: 20-40 parts organic fermentation broth, 1-3 parts monosodium glutamate, 30-50 parts adsorbent filler, 10-15 parts water-absorbing resin, and 10-15 parts binder. The raw materials used in the preparation also contain at least one of the following by weight: 0.01-2 parts indolebutyric acid, 0.01-2 parts naphthaleneacetic acid, or 0.001-0.5 parts S-inducer. The adhesive is composed of polylactic acid, sulfonated modified lignin, polyvinyl alcohol, and silane coupling agent in a weight ratio of (10-15):(5-8):(3-5):(0.5-2); The method for preparing the sulfonated modified lignin includes the following steps: Lignin and Na2SO3 were mixed evenly at a weight ratio of (3-5):(2-3), and a 15% NaOH solution was added. The mixture was reacted at 150-200℃ for 3-5 hours to obtain sulfonated modified lignin. The preparation method of the adsorbent filler includes the following steps: B1. Add volcanic mud, Al2O3 powder, and activated carbon powder to an aqueous solution of silane coupling agent, sonicate and stir to prepare a suspension; B2. Carboxyethyl cellulose is added to the suspension to form a slurry, which is then dried and ground to produce a composite powder. B3. Weigh 30-40 parts by weight of zeolite particles, 20-30 parts by weight of coal gangue powder, 30-40 parts by weight of clay, 4-8 parts by weight of ammonium bicarbonate, and 35-50 parts by weight of the composite powder, mix them evenly, add 25-35 parts by weight of water, granulate, and make granules. B4. The particles are preheated to 105-115℃, then calcined at 500-700℃ and cooled to produce an adsorbent filler. The method for preparing the organic fermentation broth includes the following steps: A1. Starting materials, including the following components in parts by weight: 100-200 parts manure, 30-50 parts berries, 10-15 parts garlic stalks, 8-12 parts chili stalks, 10-15 parts tobacco stalks, 10-15 parts peach leaves, 12-18 parts locust leaves, 12-18 parts neem leaves, 5-10 parts cosmos, and 4-8 parts morning glory. A2. Add a compound microbial strain to the starting material, wherein the amount of the compound microbial strain added is 0.6-1.2% of the weight of the starting material; A3. Add a fermentation function enhancer, wherein the fermentation function enhancer comprises the following components in parts by weight: 50-90 parts of bio-humic acid from kitchen fermentation, 5-10 parts of quicklime, 0.01-0.1 parts of polyaspartic acid, 6-12 parts of vermiculite powder, 2-5 parts of zeolite powder, and 10-15 parts of nitration inhibitor. A4. Backmixing: Fermentation includes the initial, middle and late stages. The material from the middle stage (3-5 days) is backmixed, with the backmixing amount being 10-30% of the initial material. The fermented material is then filtered to obtain the organic fermentation liquid.

2. The soil nutrient conditioner for crop cultivation according to claim 1, characterized in that, The weight ratio of Al2O3 powder to volcanic mud and activated carbon powder in step B1 is (1-3):1:

1.

3. The soil nutrient conditioner for crop cultivation according to claim 1, characterized in that, The particle size of the particles mentioned in step B3 is 2-4 mm.

4. A soil nutrient conditioner for crop cultivation according to claim 1, characterized in that, The compound microbial strain mentioned in step A2 includes at least one of actinomycetes, yeasts, Bacillus subtilis, white-rot fungi, nitrogen-fixing bacteria, phosphate-solubilizing bacteria, potassium-solubilizing bacteria, and lactic acid bacteria.

5. A soil nutrient conditioner for crop cultivation according to claim 1, characterized in that, The berries mentioned in step A1 include at least one of apples, citrus fruits, pears, dates, persimmons, grapes, and watermelons.

6. A soil nutrient conditioner for crop cultivation according to claim 1, characterized in that, The method for preparing the water-absorbing resin includes the following steps: Mix 40-50 parts of acrylamide, 4-8 parts of acrylic acid, 0.4-0.6 parts of potassium persulfate, and 0.02-0.03 parts of methylenebisacrylamide, then add 0.1-0.2 parts of N,N,N',N'-tetramethylethylenediamine dropwise, mix thoroughly, and react for 1-3 hours. Dry the resulting gel polymer and then pulverize it into resin particles. Use sodium hexadecyl diphenyl ether disulfonate to perform pressurized spray treatment on the resin particles to obtain a water-absorbing resin, wherein the amount of sodium hexadecyl diphenyl ether disulfonate is 1-2 wt% of the resin particles.

7. A soil nutrient conditioner for crop cultivation according to claim 6, characterized in that, The reaction temperature is 5-30℃.

8. A soil nutrient conditioner for crop cultivation according to claim 6, characterized in that, The average particle size of the resin particles is 0.05-0.1 mm.

9. A method for preparing a soil nutrient conditioner for crop cultivation as described in any one of claims 1 to 8, characterized in that, Includes the following steps: (1) Mix at least one of indolebutyric acid, naphthaleneacetic acid, and S-inducer with organic fermentation broth, sodium glutamate, and adsorbent packing material according to the weight parts, and fully adsorb; (2) Add the water-absorbing resin according to the weight parts, mix evenly, and then evenly sprinkle the adhesive on the surface of the mixed raw materials to obtain the soil nutrient conditioner precursor; (3) The soil nutrient regulator precursor described in step (2) is extruded and granulated. The granulation conditions are adjusted so that the particle size is controlled at 3-5 mm. Then it is dried to obtain the soil nutrient regulator.

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