A composite soil conditioner and a method for preparing the same

Abstract

The present application relates to a kind of composite soil conditioner and its preparation method, suitable for the rapid improvement of desertification, sandy soil.The conditioner is composed of potassium humate, ammonium humate, potassium fulvic acid, polyacrylamide, superabsorbent resin, Tween 20 and carrier filler and slow-release nutrient regulator, etc., which can improve soil water retention, promote the formation of granules, enhance the root absorption capacity, restore soil fertility and improve crop growth conditions.The preparation method includes carrier filler drying, mixing of each component, adding polyacrylamide and superabsorbent resin, low-speed stirring and sieving packaging.Field tests show that the conditioner is superior to traditional conditioner in improving soil water-holding capacity, water-stable aggregate content and crop yield per mu, and can significantly improve the structure of desertification soil and crop growth environment.

Description

Technical Field

[0001] This invention belongs to the field of soil remediation and soil fertility reconstruction technology, specifically, it relates to a composite soil conditioner and its preparation method. Background Technology

[0002] Desertified soils, sandy soils, and degraded arable land are widespread in Northwest my country, North China, and parts of semi-arid regions. These soils typically suffer from low organic matter content, poor water retention, lack of aggregate structure, loose surface layer prone to wind erosion, insufficient nutrient supply, and low crop seedling survival rates. Traditional remediation methods for these soils often rely on long-term application of organic fertilizers, straw return to the field, planting of stress-resistant pioneer plants, or combining with engineering sand-fixing measures to gradually improve the soil's physical and chemical properties. These remediation cycles are often lengthy, usually requiring years of continuous investment to gradually restore basic productivity, which is insufficient to meet the practical needs of short-term effectiveness, same-year planting, and rapid yield increases.

[0003] Most existing soil conditioners focus on single-function designs, such as adjusting soil pH solely through inorganic salts, increasing soil water holding capacity solely through water-absorbing materials, or increasing organic matter content solely through humic acids. These products often have the following shortcomings:

[0004] First, the improved functions are scattered and cannot simultaneously take into account water retention, fertilizer retention, sand fixation, and promotion of aggregate formation and crop root absorption.

[0005] Second, there is a lack of systematic solutions to the complex problems of organic matter deficiency, loose structure, easy water loss and nitrogen deficiency in desertified soils.

[0006] Third, the period for seeing results is relatively long, making it difficult to establish stable farming conditions within a single crop season;

[0007] Fourth, some existing products do not adequately consider soil wetting and dispersion properties, resulting in uneven distribution of active ingredients in sandy or semi-sandy soils, which affects the application effect.

[0008] Fifth, existing solutions lack a holistic design that balances crop yield increases in the current season with long-term soil improvement, often focusing on only one aspect; existing comparative technologies are mainly aimed at improving saline-alkali or alkaline soils, rather than specifically targeting the rapid restoration of desertified or sandy soils.

[0009] In view of this, the present invention is proposed. Summary of the Invention

[0010] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows:

[0011] A composite soil conditioner, comprising the following components by weight:

[0012] Potassium humate 20-35 parts; ammonium humate 10-20 parts; potassium fulvate 8-15 parts; polyacrylamide 0.5-3 parts; superabsorbent resin 3-8 parts; Tween 20 0.1-0.5 parts; carrier filler 35-60 parts;

[0013] 2-8 parts of slow-release nutrient regulator.

[0014] Wherein: the potassium humate is used to increase the soil organic matter content, improve the soil colloidal environment, activate the phosphorus and potassium resources in the soil that are difficult to utilize, and promote the formation of primary aggregates between soil particles;

[0015] The ammonium humate is used to provide a fast-acting nitrogen source and active humic acid groups, enhance the speed of soil fertility recovery, and improve crop seedling growth.

[0016] Potassium humate, as a small molecule active component, is used to promote root absorption, enhance soil drought and stress resistance, and accelerate the effectiveness of soil conditioners.

[0017] The polyacrylamide is used to enhance the bridging and flocculation effect between fine particles and organic components, enabling the soil to quickly form a relatively stable water-stable aggregate structure.

[0018] The superabsorbent resin is used to absorb and store irrigation water or rainwater, reducing soil moisture evaporation loss and deep seepage loss.

[0019] Tween 20, as a nonionic surfactant, is used to improve the dispersion uniformity and wetting and penetration capacity of the composite components in the soil, thereby improving the efficiency of nutrient transfer and rhizosphere absorption.

[0020] The carrier filler is used to improve the product's flowability and mechanical application performance, and to reduce the unit application cost;

[0021] The slow-release nutrient regulator is used to supplement the nitrogen, phosphorus, and potassium, as well as some micronutrients required for crop growth, in order to balance soil improvement and crop yield formation in the current season.

[0022] In a preferred embodiment of the present invention, the polyacrylamide is preferably anionic polyacrylamide with a molecular weight of 8 million to 12 million.

[0023] In a preferred embodiment of the present invention, the superabsorbent resin is preferably a sodium polyacrylate type superabsorbent resin.

[0024] In a preferred embodiment of the present invention, the carrier filler is selected from one or more of bentonite, diatomite, weathered coal and straw powder.

[0025] In a preferred embodiment of the present invention, the slow-release nutrient regulator is selected from one or more of monoammonium phosphate, potassium sulfate, and calcium magnesium phosphate fertilizer.

[0026] As a preferred embodiment of the present invention, the preferred formulation of the composite soil conditioner is: 30 parts potassium humate, 15 parts ammonium humate, 12 parts potassium fulvate, 1 part polyacrylamide, 5 parts superabsorbent resin, 0.3 parts Tween 20, 38 parts bentonite, 10 parts straw powder and 2 parts monoammonium phosphate.

[0027] As a preferred embodiment of the present invention, the present invention also provides a method for preparing the above-mentioned composite soil conditioner, comprising the following steps:

[0028] Step S1: Dry the carrier filler to ensure that its moisture content is no more than 10% to avoid localized moisture absorption and clumping during subsequent mixing, which would affect the uniformity of the product.

[0029] Step S2: Add potassium humate, ammonium humate, potassium fulvate and slow-release nutrient regulator into the mixing equipment according to the formula ratio, stir and mix for 10-20 minutes to form a mixed system of basic nutrients and organic activity.

[0030] Step S3: Add polyacrylamide and superabsorbent resin to the above mixture and continue mixing for 10-15 minutes to ensure that the granulation aid and water-retaining components are evenly dispersed.

[0031] Step S4: Add Tween 20 and stir at low speed for 5-10 minutes to ensure that the surface-active components are evenly attached to the particle surface and enhance the overall wetting and dispersion performance.

[0032] Step S5: Sieve, measure and package the mixture to obtain the finished compound soil conditioner.

[0033] Compared with the prior art, the present invention has the following advantages:

[0034] This invention, through the synergistic effect of humic acid components, polyacrylamide, superabsorbent resin and Tween 20, can improve soil structure and water retention capacity in a short period of time, enabling desertified soil to form a more stable aggregate structure within 7-15 days, and significantly shortening the improvement cycle.

[0035] This invention not only improves the physical and chemical properties of soil, but also supplements the nutrients required for crop growth by using ammonium humate and slow-release nutrient regulators, enabling direct sowing in the same season after improvement and obtaining higher yields;

[0036] This invention is designed to address the core problems of desertification, sandification, and severely degraded soils, and can specifically alleviate the defects of strong soil wind erosion, low fertility, and easy water loss. This invention adopts a room temperature dry powder stepwise mixing process, which does not require complex granulation or high temperature reaction processes, has low requirements for production equipment, and is easy to implement for industrialization.

[0037] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0038] In the attached diagram:

[0039] Figure 1 This is a schematic diagram illustrating the synergistic effect of the components in the composite soil conditioner of the present invention;

[0040] Figure 2 This is a flow chart of the preparation process of the composite soil conditioner of the present invention;

[0041] Figure 3 This is a schematic diagram illustrating the mechanism of action of the composite soil conditioner of the present invention when applied to desertified soil;

[0042] Figure 4 This is a comparison chart of the effects of the embodiments of the present invention and the control group on soil water holding capacity, aggregate content and crop yield per acre. Detailed Implementation

[0043] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the invention will be further described in detail below with reference to specific embodiments, comparative examples, and experimental examples. It should be understood that the following embodiments are for illustrative purposes only and are not intended to limit the scope of protection of this invention. All equivalent substitutions, improvements, and modifications made within the spirit and principles of this invention should fall within the scope of protection of this invention.

[0044] This invention relates to a composite soil conditioner, comprising, by weight, 20-35 parts potassium humate, 10-20 parts ammonium humate, 8-15 parts potassium fulvate, 0.5-3 parts polyacrylamide, 3-8 parts superabsorbent polymer (SAP), 0.1-0.5 parts Tween 20, 35-60 parts carrier filler, and 2-8 parts slow-release nutrient regulator. The composite soil conditioner is suitable for the rapid improvement of desertified soils, sandy soils, or soils with low water and fertilizer retention capacity. The carrier filler can be selected from one or more of bentonite, diatomaceous earth, weathered coal, and straw powder; the slow-release nutrient regulator can be selected from one or more of monoammonium phosphate, potassium sulfate, and calcium magnesium phosphate. The preparation method includes steps such as pre-drying the carrier filler, stepwise mixing of active components, adding polyacrylamide and SAP for further mixing, adding Tween 20 for low-speed dispersion, and sieving and packaging.

[0045] In the following embodiments, unless otherwise specified, the raw materials are all commercially available conventional agricultural or industrial grade products; the test water is room temperature clean water; all percentages are mass percentages; and all "parts" are parts by weight.

[0046] Example 1

[0047] This embodiment is a preferred formulation embodiment.

[0048] Weigh the following components by weight:

[0049] 30 parts potassium humate;

[0050] 15 parts of ammonium humate;

[0051] 12 parts potassium humate;

[0052] One part of anionic polyacrylamide;

[0053] 5 parts of sodium polyacrylate superabsorbent polymer;

[0054] Tween 200.3 units;

[0055] 38 parts of bentonite;

[0056] 10 parts straw powder;

[0057] Two parts of monoammonium phosphate.

[0058] Among them, the molecular weight of anionic polyacrylamide is about 10 million; the water absorption ratio of superabsorbent resin is 350-450 times; the particle size of bentonite is 100-150 mesh; and the particle size of straw powder is 80-120 mesh.

[0059] The preparation steps are as follows:

[0060] S1. Place bentonite and straw powder in a hot air oven and dry them at 55-65℃ for 2-4 hours until the moisture content is no higher than 10%.

[0061] S2. Add the dried bentonite and straw powder to a horizontal ribbon mixer, then add potassium humate, ammonium humate, potassium fulvate and monoammonium phosphate in sequence, and mix at 35-50 rpm for 12-18 minutes to obtain the basic mixture.

[0062] S3. Add anionic polyacrylamide and superabsorbent resin to the basic mixture, and continue mixing at 30-45 rpm for 10-15 minutes to ensure that the granulation promoting component and the water-retaining component are fully and evenly dispersed.

[0063] S4. Add Tween 20 to the material by atomization spraying and mix at a low speed of 15-25 rpm for 5-10 minutes to make Tween 20 evenly adhere to the particle surface to improve the overall wetting and dispersion performance.

[0064] S5. After sieving the obtained mixture through a 100-mesh sieve, measure and package it to obtain the finished composite soil conditioner.

[0065] When applying, evenly spread the compound soil conditioner at a rate of 50 kg / mu on the surface of desertified sandy loam, rotary tillage to incorporate it into the 0-20 cm topsoil layer, and then irrigate thoroughly. Seven days after application, a reduction in surface dusting can be observed; 15 days after application, the bonding of fine particles in the soil surface is enhanced, and a relatively stable aggregate structure is initially formed; after sowing, the uniformity of crop emergence and root extension are significantly improved compared to untreated plots.

[0066] Example 2

[0067] This embodiment is a low-cost, large-area pre-modified embodiment.

[0068] Weigh the following components by weight:

[0069] 25 parts of potassium humate;

[0070] 12 parts of ammonium humate;

[0071] 10 parts potassium humate;

[0072] 0.8 parts of anionic polyacrylamide;

[0073] 4 parts of superabsorbent polymer;

[0074] Tween 200.2 servings;

[0075] 50 parts of weathered coal;

[0076] 8 parts straw powder;

[0077] Two parts of calcium magnesium phosphate fertilizer.

[0078] The preparation method is basically the same as in Example 1, except that the weathered coal and straw powder are pre-dried in step S1 and the basic mixing time is appropriately extended to 15-20 minutes in step S2 to ensure the uniformity of the powder carrier system.

[0079] In this embodiment, weathered coal is used as the main carrier filler, which significantly reduces the unit product cost and is suitable for pre-improvement treatment of large areas of desertified land. When the product prepared in this embodiment is applied to slightly desertified soil at a rate of 45 kg / mu, under the same irrigation system, the rate of moisture loss from the soil surface is significantly slower than that of the control plot, the seedling leaves of crops are darker, and the total root length and number of fibrous roots are increased compared with the control plot.

[0080] Example 3

[0081] In this embodiment, the following components are weighed out in parts by weight:

[0082] 28 parts of potassium humate;

[0083] 14 parts of ammonium humate;

[0084] 12 parts potassium humate;

[0085] 1.2 parts of anionic polyacrylamide;

[0086] 7 parts of superabsorbent polymer;

[0087] Tween 200.35 doses;

[0088] 36 parts of bentonite;

[0089] 8 parts diatomaceous earth;

[0090] 2 parts monoammonium phosphate;

[0091] 1.5 parts potassium sulfate.

[0092] The preparation method is the same as in Example 1.

[0093] This embodiment improves the water retention of the resulting amendment by increasing the amount of superabsorbent polymer and introducing diatomaceous earth, resulting in superior water retention in fields with high evaporation and long irrigation intervals. When applied to corn or spring wheat fields in semi-arid regions, it can enhance the water retention capacity of the topsoil after irrigation and slow down the rate of surface moisture loss, making it suitable for applications with high moisture retention requirements.

[0094] Example 4

[0095] In this embodiment, the following components are weighed out in parts by weight:

[0096] 32 parts of potassium humate;

[0097] 18 parts of ammonium humate;

[0098] 14 parts of potassium humate;

[0099] 1.5 parts of anionic polyacrylamide;

[0100] 6 parts of superabsorbent polymer;

[0101] Tween 200.4 units;

[0102] 35 parts bentonite;

[0103] 10 parts straw powder;

[0104] 3 parts monoammonium phosphate;

[0105] 1.5 parts potassium sulfate.

[0106] The preparation method is the same as in Example 1.

[0107] This embodiment appropriately increases the proportion of humic acid active components and slow-release nutrient regulators, making it more suitable for scenarios where soil improvement and seasonal yield increase are equally important. When this product is applied at a rate of 55 kg / mu to moderately degraded sandy loam soil, the sown crops exhibit vigorous seedling growth, increased tillering number, and larger leaf area, and show higher ear grain number and better yield formation ability at maturity.

[0108] Comparative Example

[0109] Comparative Example 1

[0110] This comparative example is used to verify the role of polyacrylamide in promoting soil aggregate formation.

[0111] Weigh out 30 parts by weight of potassium humate, 15 parts by weight of ammonium humate, 12 parts by weight of potassium fulvate, 5 parts by weight of superabsorbent resin, 0.3 parts by weight of Tween 200, 38 parts by weight of bentonite, 10 parts by weight of straw powder and 2 parts by weight of monoammonium phosphate. Do not add polyacrylamide. The remaining preparation steps are the same as in Example 1.

[0112] When the product was applied to desertified sandy loam soil, although the soil organic matter level and basic fertility were improved, the bridging and flocculation between soil particles was weak, the formation rate of water-stable aggregates was slow, the soil surface was still relatively loose after irrigation, and the resistance to wind erosion and scour was lower than that of Example 1.

[0113] Comparative Example 2

[0114] This comparative example is used to verify the role of superabsorbent polymers in soil water retention.

[0115] Weigh out 30 parts potassium humate, 15 parts ammonium humate, 12 parts potassium fulvate, 1 part polyacrylamide, 0.3 parts Tween 20, 38 parts bentonite, 10 parts straw powder, and 2 parts monoammonium phosphate by weight. Do not add superabsorbent resin. The remaining preparation steps are the same as in Example 1.

[0116] When the product was applied to sandy loam soil, the soil structure improvement effect could still be observed. However, under continuous hot and sunny weather, the surface moisture content of the soil decreased rapidly, and seedlings were prone to mild water shortage symptoms, indicating that superabsorbent polymers play an important role in maintaining the soil's continuous water supply capacity.

[0117] Comparative Example 3

[0118] This comparative example is used to verify the effect of Tween 20 on the wetting and dispersion effect of active components.

[0119] Weigh out 30 parts potassium humate, 15 parts ammonium humate, 12 parts potassium fulvate, 1 part polyacrylamide, 5 parts superabsorbent resin, 38 parts bentonite, 10 parts straw powder, and 2 parts monoammonium phosphate by weight. Do not add Tween 20. The remaining preparation steps are the same as in Example 1.

[0120] After the product was applied to the test site, although the overall improvement direction was the same as in Example 1, the uniformity of improvement between different locations of the plot was poor, and the dispersion of active components in the soil layer was insufficient, resulting in less uniform seedling emergence and root distribution than in Example 1.

[0121] Comparative Example 4

[0122] This comparative example is a blank control group. No soil conditioner was applied, and the land was prepared, sown, and irrigated in accordance with local conventional methods. It is used to compare with the examples and other comparative examples.

[0123] Test case

[0124] Experimental Example 1: Experiment on the effect of soil physicochemical property improvement

[0125] Experimental Materials and Methods

[0126] Typical desertified sandy loam soil from a semi-arid region in Northwest China was selected as the test soil. The basic indicators of the test soil were measured before the experiment as follows: pH 8.2, organic matter 4.9 g / kg, available nitrogen 28.6 mg / kg, field water holding capacity 11.8%, water-stable aggregate content above 0.25 mm 18.7%, and soil bulk density 1.57 g / cm³.

[0127] The experiment included five treatments: Example 1, Comparative Example 1, Comparative Example 2, Comparative Example 3, and a blank control group. Each treatment was applied at a rate equivalent to 50 kg / mu (approximately 33.5 kg / acre) and thoroughly mixed with the tested soil before being placed in identical experimental tanks. Each treatment had three replicates. After treatment, the soil was uniformly irrigated to near field capacity and managed under the same temperature and humidity conditions for 30 days. After 30 days, the soil field capacity, water-stable aggregate content, organic matter, available nitrogen, and soil bulk density were measured for each group.

[0128] Test results

[0129] Table 1 Soil physicochemical indices after 30 days for each treatment.

[0130] Blank control group 12.1 19.4 5.1 29.3 1.56 Comparative Example 1 16.8 27.9 7.9 41.2 1.44 Comparative Example 2 14.9 35.6 8.0 42.1 1.40 Comparative Example 3 16.1 31.8 7.8 40.5 1.43 Example 1 18.7 39.6 8.5 45.8 1.34

[0131] As shown in Table 1, Example 1 outperformed the comparative examples and the blank control group in increasing field water holding capacity, water-stable aggregate content, organic matter content, and available nitrogen content. Furthermore, it significantly reduced soil bulk density, indicating that the composite soil conditioner of this invention can significantly improve the structural state and fertility of desertified soils. Specifically, polyacrylamide significantly promotes aggregate structure formation, superabsorbent polymer (SAP) significantly enhances water holding capacity, and Tween 20 helps ensure the uniform dispersion and effective utilization of each component in the soil.

[0132] Experiment Example 2: Field Application Trial of Spring Wheat

[0133] Experimental Design

[0134] Field trials were conducted on semi-arid desertified sandy loam soil plots, with spring wheat as the experimental crop. A randomized block design was used, with each plot measuring 30 m² and each treatment having three replicates. Before sowing, the soil amendment was evenly applied according to the corresponding treatment plan and rotary tilled into the 0-20 cm soil layer. The sowing rate, irrigation system, fertilization management, and pest and weed control measures were kept consistent across all treatments.

[0135] The emergence rate was investigated 14 days after sowing, the plant height and number of tillers were investigated at the jointing stage, and the thousand-grain weight and yield per mu were measured at the maturity stage.

[0136] Test results

[0137] Table 2. Effects of each treatment on the growth and yield of spring wheat:

[0138] Blank control group 61.3 31.5 2.1 32.6 168 Comparative Example 1 81.7 40.8 3.0 36.8 248 Comparative Example 2 77.9 39.6 2.8 35.9 231 Comparative Example 3 79.4 40.1 2.9 36.2 239 Example 1 90.6 44.7 3.4 38.5 286

[0139] As shown in Table 2, compared with the blank control group, Example 1 significantly improved the emergence rate, seedling growth, and final yield per acre of spring wheat. Compared with the comparative examples, Example 1 still showed significant advantages in terms of seedling uniformity, thousand-grain weight, and yield per acre. This indicates that the present invention does not simply supplement organic matter or simply retain water, but achieves a comprehensive effect of promoting aggregate formation, improving soil water retention capacity, improving nutrient environment, and enhancing root absorption through the synergistic effect of humic acid components, polyacrylamide, superabsorbent resin, and Tween 20.

[0140] Test Example 3: Verification Test of Water Retention and Moisture Retention Performance

[0141] Test methods

[0142] Soil samples from the blank control group, comparative example 2, and Example 1 were placed into soil columns of the same size and irrigated to near field capacity. The samples were then left to stand at 25-30℃ to lose water. Soil moisture content was measured on day 1, day 4, and day 7.

[0143] Test results

[0144] Table 3. Changes in soil moisture content during natural water loss for each treatment:

[0145] Blank control group 12.4 8.1 5.6 Comparative Example 2 17.1 12.3 8.7 Example 1 19.0 15.6 11.8

[0146] As shown in Table 3, Example 1 maintained a high moisture content throughout the water loss process, especially on the 4th and 7th days. Compared with the blank control group and Comparative Example 2 without superabsorbent resin, the advantages were more obvious. This indicates that the superabsorbent resin in this invention can effectively adsorb and slowly release soil moisture, reduce evaporation loss and deep seepage loss, thereby improving soil moisture retention capacity and crop seedling drought resistance stability.

[0147] In summary, the composite soil conditioner provided by this invention, through the synergistic effect of potassium humate, ammonium humate, potassium fulvate, polyacrylamide, superabsorbent resin, Tween 20, carrier filler, and slow-release nutrient regulator, can improve the physicochemical properties of desertified soils, sandy soils, or soils with low water and fertilizer retention capacity in a relatively short period of time, promote the formation of soil aggregates, enhance water and fertilizer retention capacity, improve the rhizosphere environment of crops, and simultaneously ensure crop yield formation in the current season. Compared with the blank control group and the comparative example lacking key components, this invention has significant advantages in improving soil field water holding capacity, water-stable aggregate content, crop emergence rate, and yield per acre, indicating that this invention has good practical application value and promising prospects for promotion.

[0148] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A composite soil conditioner, characterized in that, By weight, it includes the following components: 20-35 parts potassium humate, 10-20 parts ammonium humate, 8-15 parts potassium fulvate, 0.5-3 parts polyacrylamide, 3-8 parts superabsorbent resin, 0.1-0.5 parts Tween 20, 35-60 parts carrier filler, and 2-8 parts slow-release nutrient regulator. The composite soil conditioner is used for the rapid improvement of desertified soil, sandy soil or soil with low water and fertilizer retention capacity, so as to achieve soil structure reconstruction, improvement of water and fertilizer retention performance and restoration of crop planting capacity in the current season.

2. The composite soil conditioner according to claim 1, characterized in that, The polyacrylamide is an anionic polyacrylamide with a molecular weight of 8-12 million, used to enhance the bridging and flocculation effect between soil fine particles and humic acid components, and to promote the rapid formation of water-stable aggregates.

3. The composite soil conditioner according to claim 1, characterized in that, The superabsorbent resin is a sodium polyacrylate type superabsorbent resin with a water absorption ratio of 300-500 times. It is used to adsorb and store irrigation water or rainwater, reducing soil evaporation loss and deep seepage loss.

4. The composite soil conditioner according to claim 1, characterized in that, Tween 20 is a nonionic surfactant used to improve the dispersibility, wettability, and nutrient transfer efficiency of the active components in the soil.

5. The composite soil conditioner according to claim 1, characterized in that, The carrier filler is selected from one or more of bentonite, diatomite, weathered coal and straw powder, with a preferred particle size of 80-200 mesh.

6. The composite soil conditioner according to claim 1, characterized in that, The slow-release nutrient regulator is selected from one or more of monoammonium phosphate, potassium sulfate, and calcium magnesium phosphate fertilizer, and is used to supplement the nitrogen, phosphorus, potassium, and trace elements required for crop growth.

7. The composite soil conditioner according to any one of claims 1-6, characterized in that, The preferred weight ratio of the composite soil conditioner is as follows: 30 parts potassium humate, 15 parts ammonium humate, 12 parts potassium fulvate, 1 part polyacrylamide, 5 parts superabsorbent resin, 0.3 parts Tween 200, 38 parts bentonite, 10 parts straw powder, and 2 parts monoammonium phosphate.

8. A method for preparing a composite soil conditioner as described in any one of claims 1-7, characterized in that, Includes the following steps: Step S1: Dry the carrier packing material until the moisture content is no higher than 10%; Step S2: Add potassium humate, ammonium humate, potassium fulvate and slow-release nutrient regulator according to the formula, and mix and stir for 10-20 minutes; Step S3: Add polyacrylamide and superabsorbent polymer, and continue mixing for 10-15 minutes; Step S4: Add Tween 20 and stir at low speed for 5-10 minutes until evenly dispersed; Step S5: Sieve, measure, and package to obtain the finished compound soil conditioner.

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