Organic improver for improving soil structure stability and improvement method

Abstract

The invention provides an organic improver for improving soil structure stability and an improvement method, and belongs to the technical field of improvement of specific waste soil of a refuse landfill. The organic improver for improving the soil structure stability comprises a physical improvement component and a chemical improvement component, the physical improvement component is wormcast with the particle size of 0 to 2.5 mm or 2.5 to 5.0 mm; the chemical improvement component comprises an inorganic base fertilizer and an organic fertilizer, and the application mass ratio of the organic fertilizer to the inorganic base fertilizer is (50: 1)-(40: 1). A physical-chemical coupling synergistic scheme is adopted, physical improvement components and chemical improvement components are clear in division of labor and have synergistic interaction, the core problems of soil physical structure hardening and chemical fertility deficiency are synchronously solved, the defect of single improvement effect in the prior art is overcome, and synchronous optimization of soil physical properties and chemical fertility is achieved.

Description

Technical Field

[0001] This invention relates to the field of soil improvement technology for specific waste soils in landfills, and more specifically, to an organic soil conditioner and method for improving soil structural stability. Background Technology

[0002] With the acceleration of urbanization and the in-depth promotion of "zero-waste city" construction in my country, a large amount of urban waste has been disposed of through landfills, resulting in massive landfill areas. The soil in these areas suffers from structural degradation (such as compaction, heavy clay, poor aeration and permeability, and high pH) and nutrient deficiency (especially severe phosphorus deficiency), often leading to plant death when directly planted with garden vegetation. Improving and restoring the soil of landfills to restore their ecological functions is a key area for sustainable urban development, aiming to improve urban land resource utilization and enhance the urban environment.

[0003] Currently, such soils are either abandoned or improved through soil replacement using chemical fertilizers or ordinary organic fertilizers. The limitations of these methods are that adding new soil wastes and damages soil resources, failing to address the fundamental goal of soil remediation; the application of chemical fertilizers alone can only temporarily increase soil nutrients, but exacerbates soil salinization and compaction; due to low nutrient utilization, excessive application often leads to nutrient loss and some pollution of groundwater, and it cannot improve soil physical structure; while ordinary organic fertilizers can slowly increase soil organic matter, they cannot meet the urgent needs of vegetation reconstruction, especially failing to provide highly activated, readily available phosphorus that plants can directly utilize, thus hindering normal plant growth.

[0004] In summary, existing technologies cannot synergistically solve the complex problem of poor soil physical structure and difficulties in phosphorus conversion and utilization in landfills. Developing a soil improvement and remediation technology that can simultaneously improve soil structure and significantly enhance phosphorus availability is an urgent need for realizing the resource utilization of urban waste soil. Summary of the Invention

[0005] To overcome the above deficiencies, the present invention provides an organic amendment and method for improving soil structural stability to overcome or at least partially solve the above technical problems.

[0006] This invention is implemented as follows: This invention provides an organic soil conditioner for improving soil structural stability, comprising physical and chemical amendment components; the physical amendment component is earthworm castings with a particle size of 0-2.5 mm or 2.5-5.0 mm; the chemical amendment component comprises inorganic base fertilizer and organic fertilizer, wherein the mass ratio of organic fertilizer to inorganic base fertilizer is 50:1-40:1.

[0007] In a preferred embodiment, the earthworm castings are obtained by digesting and decomposing an organic substrate by Eisenia fetida, and the organic substrate is selected from one or more of cow dung, kitchen waste, and agricultural production residues; the earthworm castings are added at a ratio of 20%-30% of the volume of the soil to be improved, and the corresponding particle size is selected based on the need to improve the stability of soil aggregates, the goal of improving enzyme activity, or the requirement for quick-acting nutrient supplementation.

[0008] In a preferred embodiment, earthworm castings with a particle size of 0-2.5 mm are more conducive to increasing the content of available phosphorus and available potassium in the soil and urease activity, while earthworm castings with a particle size of 2.5-5.0 mm are more conducive to increasing the average weight diameter, geometric mean diameter and sucrase activity of soil aggregates.

[0009] In a preferred embodiment, the inorganic base fertilizer is composed of superphosphate, calcium sulfate and elemental sulfur, with a mass ratio of 20-30:20-30:1; the amount of inorganic base fertilizer added is 2‰-4‰ of the soil mass to be improved.

[0010] In a preferred embodiment, the organic fertilizer comprises one of two types: a single type of garden waste and a mixture of garden waste and cow manure, wherein the mass ratio of garden waste to cow manure is 1:0 to 5:1, and the amount of organic fertilizer added is 10%-15% of the mass of the soil to be improved.

[0011] In a preferred embodiment, the garden waste originates from fallen leaves and branches generated during garden maintenance. After being mechanically crushed, the particle size is less than 2 cm, and the waste has not undergone composting treatment.

[0012] In a preferred embodiment, the physical amendment component improves soil physical stability by optimizing soil pore structure and providing a microenvironment for microbial attachment; the chemical amendment component promotes the conversion of stable phosphorus in the soil into active phosphorus through the synergistic effect of rapid phosphorus supply from inorganic base fertilizer and long-lasting release from organic fertilizer.

[0013] In a preferred embodiment, the superphosphate is used to rapidly replenish soil phosphorus, calcium sulfate and elemental sulfur synergistically inhibit soil salinity and alkali toxicity and improve the utilization rate of superphosphate, garden waste slowly releases mineral elements, and cow manure provides abundant organic matter and promotes the conversion of stable phosphorus to active phosphorus.

[0014] An organic amendment method for improving soil structure stability is disclosed. This method is applicable to improving degraded soils that are unstructured, have low microbial activity, are phosphorus deficient, compacted and heavy, and have a high pH value. The degraded soils include landfill waste soil, urban waste soil, or barren and compacted farmland soil.

[0015] In a preferred embodiment, the soil can achieve the following effects after the method is applied: (1) The pH value decreased by up to 13.0% compared to before the improvement; (2) The content of resin phosphorus and NaHCO3-inorganic phosphorus in the soil increased by 1.8-4.4 times compared with that before the improvement; (3) The soil phosphorus activation coefficient increased by up to 2.7 times, and the phosphorus use efficiency increased by 3.2-8.3 times; (4) The content of water-stable aggregates larger than 0.25 mm in the soil increased by more than 80.0% compared with that before the improvement; (5) The total porosity, organic matter content, and urease and sucrase activities of the soil were significantly improved compared with those before the improvement.

[0016] This invention provides an organic soil conditioner and method for improving soil structural stability, the beneficial effects of which include: 1. Synergistic improvement with comprehensive effects: This invention innovatively adopts a physical-chemical coupling synergistic scheme. The physical and chemical improvement components have clear division of labor and synergistic effect, which simultaneously solves the core problems of soil physical structure compaction and chemical fertility (phosphorus) deficiency, making up for the shortcomings of the single improvement effect of existing technologies and realizing the simultaneous optimization of soil physical properties and chemical fertility.

[0017] 2. Optimized composition, balancing quick and long-lasting effects: Inorganic base fertilizer can quickly replenish phosphorus and lower soil pH, meeting the urgent needs of rapid vegetation establishment; organic components (earthworm castings, garden waste, cow manure) slowly decompose and release nutrients, continuously improving soil structure, enhancing microbial activity, and promoting the long-term transformation of stable phosphorus, forming a virtuous cycle of "quick and long-lasting effects" to ensure the sustainability of the improvement effect.

[0018] 3. Resource recycling and green environmental protection: The components of the improver are all derived from waste or agricultural / garden by-products. Earthworm castings are prepared using kitchen waste, agricultural residues, etc., and garden waste is a by-product of garden maintenance. This realizes the resource utilization of waste, which is in line with the concept of "zero waste city" construction. Moreover, the entire improvement process has no risk of secondary pollution and is environmentally friendly.

[0019] 4. Wide applicability and high promotion value: The composite soil conditioner of this invention is highly targeted and can effectively solve multiple problems of degraded soils such as landfills. It is also suitable for soils with different degrees of degradation and is applicable to the ecological restoration of various scenarios such as abandoned soils in landfills, abandoned soils in cities, and barren and compacted farmland soils. It has broad application prospects and significant ecological and social benefits. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a bar chart showing the content of water-stable aggregates in Example 1 provided by the embodiments of the present invention; Figure 2 A bar chart of effective nitrogen content in Example 1 provided for the implementation of the present invention; Figure 3 A bar chart of effective phosphorus content provided in Example 1 of the present invention; Figure 4 A bar chart of effective potassium content provided in Example 1 of the present invention; Figure 5 A bar chart of phosphorus and potassium activity in Example 1 provided for the embodiments of the present invention; Figure 6 A bar chart of sucrase activity provided in Example 1 of this invention; Figure 7 A bar chart of the first average weight diameter provided in Embodiment 1 of the present invention; Figure 8 The second average weight diameter bar chart provided in Embodiment 1 of the present invention; Figure 9 A bar chart of organic matter content provided in Example 1 of this invention; Figure 10 A diagram showing the pH value and total porosity in Example 2 provided for the implementation of this invention; Figure 11 A bar chart showing the resin phosphorus content and inorganic phosphorus content in Example 2 provided for the implementation of this invention; Figure 12 A bar chart showing the unstable phosphorus content and stable phosphorus content in Example 2 provided for the implementation of this invention; Figure 13 A bar chart showing the phosphorus activation coefficient and phosphorus utilization efficiency in Example 2 provided for the implementation of this invention. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1

[0023] Reference Figures 1-9 The present invention provides a technical solution: an organic soil conditioner for improving soil structural stability, comprising physical conditioner components and chemical conditioner components; the physical conditioner components are earthworm castings with a particle size of 0-2.5 mm or 2.5-5.0 mm; the chemical conditioner components include inorganic base fertilizer and organic fertilizer, wherein the application mass ratio of organic fertilizer to inorganic base fertilizer is 50:1-40:1. The earthworm castings are obtained by digesting and decomposing organic substrates by Eisenia fetida. The organic substrates are selected from one or more of cow dung, kitchen waste, and agricultural production residues. The earthworm castings are added at a ratio of 20%-30% of the volume of the soil to be improved, and the corresponding particle size is selected based on the needs for improving soil aggregate stability, enzyme activity enhancement, or fast-acting nutrient supplementation. The earthworm castings with a particle size of 0-2.5 mm are more conducive to increasing the content of available phosphorus and available potassium in the soil and the activity of urease, while the earthworm castings with a particle size of 2.5-5.0 mm are more conducive to increasing the average weight diameter, geometric mean diameter and sucrase activity of soil aggregates. The inorganic base fertilizer is composed of superphosphate, calcium sulfate and elemental sulfur, with a mass ratio of 20-30:20-30:1; the amount of inorganic base fertilizer added is 2‰-4‰ of the quality of the soil to be improved. The organic fertilizer comprises one of the following two types: a single type of garden waste and a mixture of garden waste and cow manure, wherein the mass ratio of garden waste to cow manure is 1:0 to 5:1, and the amount of organic fertilizer added is 10%-15% of the mass of the soil to be improved; The garden waste comes from fallen leaves and branches generated during garden maintenance. After being mechanically crushed, the particle size is less than 2cm, and it has not undergone composting treatment. The physical amendments improve soil physical stability by optimizing soil pore structure and providing a microenvironment for microbial attachment; the chemical amendments promote the conversion of stable phosphorus in the soil into active phosphorus through the synergistic effect of rapid phosphorus supply from inorganic base fertilizer and long-lasting release from organic fertilizer. The superphosphate is used to quickly replenish soil phosphorus. Calcium sulfate and elemental sulfur work synergistically to inhibit soil salinity and toxicity and improve the utilization rate of superphosphate. Garden waste slowly releases mineral elements, and cow manure provides abundant organic matter and promotes the conversion of stable phosphorus to active phosphorus.

[0024] An organic soil amendment method for improving soil structural stability is disclosed. This method is suitable for improving degraded soils that are structurally unstructured, have low microbial activity, are phosphorus-deficient, compacted, heavy, and have a high pH value. The degraded soils include landfill waste soil, urban waste soil, or barren, compacted farmland soil. After application of this method, the soil can achieve the following effects: (1) The pH value decreased by up to 13.0% compared to before the improvement; (2) The content of resin phosphorus and NaHCO3-inorganic phosphorus in the soil increased by 1.8-4.4 times compared with that before the improvement; (3) The soil phosphorus activation coefficient increased by up to 2.7 times, and the phosphorus use efficiency increased by 3.2-8.3 times; (4) The content of water-stable aggregates larger than 0.25 mm in the soil increased by more than 80.0% compared with that before the improvement; (5) The total porosity, organic matter content, and urease and sucrase activities of the soil were significantly improved compared with those before the improvement.

[0025] Verification of the effectiveness of soil structure amendments: This embodiment aims to verify the physical improvement effect of earthworm castings of a specific particle size on barren and compacted soil.

[0026] 1. The test area was a landfill in the suburbs of a city. The basic properties of the soil were: pH 9.2, bulk density 1.83 g / cm³, organic matter 10.5 g / kg, electrical conductivity 2.3 mS / m, available phosphorus 8.4 mg / kg, total phosphorus 0.6 g / kg, and total porosity 29.2%.

[0027] 2. The experimental area was a 15m × 15m plot, planted with evergreen privet trees, and the soil conditioner described in this invention was applied to the tree pits. The tree pits were 1.0m × 1.0m in size, the soil conditioner depth was 60cm, the tree pits were spaced 1.5m apart, each row was a treatment group, and 7 plants were planted in each row, for a total of 7 columns, i.e., 6 treatments and 1 control.

[0028] 3. Detailed Scheme Design Control: No modifiers added.

[0029] Treatment 1 and Treatment 2: Add 5-10% by volume earthworm castings of 0-2.5mm and 2.5-5.0mm particle size.

[0030] Treatments 3 and 4: Add 10-20% by volume earthworm castings of 0-2.5mm and 2.5-5.0mm particle size.

[0031] Treatments 5 and 6: Add 20-30% by volume earthworm castings of 0-2.5mm and 2.5-5.0mm particle size.

[0032] 4. After six months of treatment, based on parameters such as soil aggregates, related soil enzyme activity, and organic matter content, it was found that adding 20-30% earthworm castings by volume significantly increased the number of water-stable large aggregates larger than 0.25 mm, with an average increase of 79.9% compared to the control. Figure 1 Adding 10-20% by volume significantly increased the available nitrogen content in the soil, increasing it by an average of about 2 times compared to the control. Figure 2 At the same addition ratio, smaller particle size is more conducive to increasing the content of available phosphorus and available potassium. Figure 3 ; Figure 4 Earthworm castings with a particle size of 0-2.5mm are more conducive to increasing soil urease activity. Figure 5 Larger particle size is more conducive to improving sucrase activity. Figure 6 Larger particle sizes of 2.5-5.0 mm are more conducive to increasing the average weight diameter and geometric mean diameter of aggregates. Figure 7 ; Figure 8 This increases soil organic matter content, and the increased organic matter content also promotes the formation of soil aggregates. Figure 9 ). Example 2

[0033] Reference Figures 10-13 The present invention provides a technical solution: an organic soil conditioner for improving soil structural stability, comprising physical conditioner components and chemical conditioner components; the physical conditioner components are earthworm castings with a particle size of 0-2.5 mm or 2.5-5.0 mm; the chemical conditioner components include inorganic base fertilizer and organic fertilizer, wherein the application mass ratio of organic fertilizer to inorganic base fertilizer is 50:1-40:1. The earthworm castings are obtained by digesting and decomposing organic substrates by Eisenia fetida. The organic substrates are selected from one or more of cow dung, kitchen waste, and agricultural production residues. The earthworm castings are added at a ratio of 20%-30% of the volume of the soil to be improved, and the corresponding particle size is selected based on the needs for improving soil aggregate stability, enzyme activity enhancement, or fast-acting nutrient supplementation. The earthworm castings with a particle size of 0-2.5 mm are more conducive to increasing the content of available phosphorus and available potassium in the soil and the activity of urease, while the earthworm castings with a particle size of 2.5-5.0 mm are more conducive to increasing the average weight diameter, geometric mean diameter and sucrase activity of soil aggregates. The inorganic base fertilizer is composed of superphosphate, calcium sulfate and elemental sulfur, with a mass ratio of 20-30:20-30:1; the amount of inorganic base fertilizer added is 2‰-4‰ of the quality of the soil to be improved. The organic fertilizer comprises one of the following two types: a single type of garden waste and a mixture of garden waste and cow manure, wherein the mass ratio of garden waste to cow manure is 1:0 to 5:1, and the amount of organic fertilizer added is 10%-15% of the mass of the soil to be improved; The garden waste comes from fallen leaves and branches generated during garden maintenance. After being mechanically crushed, the particle size is less than 2cm, and it has not undergone composting treatment. The physical amendments improve soil physical stability by optimizing soil pore structure and providing a microenvironment for microbial attachment; the chemical amendments promote the conversion of stable phosphorus in the soil into active phosphorus through the synergistic effect of rapid phosphorus supply from inorganic base fertilizer and long-lasting release from organic fertilizer. The superphosphate is used to quickly replenish soil phosphorus. Calcium sulfate and elemental sulfur work synergistically to inhibit soil salinity and toxicity and improve the utilization rate of superphosphate. Garden waste slowly releases mineral elements, and cow manure provides abundant organic matter and promotes the conversion of stable phosphorus to active phosphorus.

[0034] An organic soil amendment method for improving soil structural stability is disclosed. This method is suitable for improving degraded soils that are structurally unstructured, have low microbial activity, are phosphorus-deficient, compacted, heavy, and have a high pH value. The degraded soils include landfill waste soil, urban waste soil, or barren, compacted farmland soil. After application of this method, the soil can achieve the following effects: (1) The pH value decreased by up to 13.0% compared to before the improvement; (2) The content of resin phosphorus and NaHCO3-inorganic phosphorus in the soil increased by 1.8-4.4 times compared with that before the improvement; (3) The soil phosphorus activation coefficient increased by up to 2.7 times, and the phosphorus use efficiency increased by 3.2-8.3 times; (4) The content of water-stable aggregates larger than 0.25 mm in the soil increased by more than 80.0% compared with that before the improvement; (5) The total porosity, organic matter content, and urease and sucrase activities of the soil were significantly improved compared with those before the improvement.

[0035] Verification of the effect of increasing available phosphorus in soil This embodiment aims to verify the phosphorus activation effect of organic-inorganic combined application on phosphorus-deficient and nutrient-poor soils.

[0036] 1. The test area was the same as in Example 1, which was a landfill in the suburbs of a city. The basic properties of the soil were: pH 9.2, bulk density 1.83 g / cm³, organic matter 10.5 g / kg, electrical conductivity 2.3 mS / m, available phosphorus 8.4 mg / kg, total phosphorus 0.6 g / kg, and total soil porosity 29.2%.

[0037] 2. The experimental area was a 15m × 10m plot, planted with evergreen privet trees, and the amendment described in this invention was applied to the tree pits. The tree pits were 1.0m × 1.0m in size, with an amendment depth of 60cm, and the tree pits were spaced 1.5m apart. Each row was a treatment group, with 7 plants planted, for a total of 5 rows, i.e., 4 treatments and 1 control.

[0038] 3. Detailed Scheme Design Control: No modifiers added.

[0039] Treatment 1: Apply inorganic fertilizer only: Add superphosphate, calcium sulfate and elemental sulfur to each tree pit at a mass ratio of 20-30:20-30:1, with a total amount not exceeding 1000g.

[0040] Treatment 2: Based on Treatment 1, add 5-10cm of garden waste to each tree pit; Treatment 3: Based on Treatment 1, replace 5-15% of garden waste with cow dung; Treatment 4: Based on Treatment 1, add 15-25% of garden waste by replacing it with cow dung.

[0041] 4. After six months of treatment, based on soil pH, porosity, Hedley phosphorus composition, phosphorus activation coefficient, and phosphorus use efficiency, it was found that adding both garden waste and cow manure effectively increased soil porosity and decreased soil pH. Partial replacement of garden waste with cow manure was more beneficial for improving phosphorus activation and use efficiency than garden waste alone. Adding garden waste alone did not significantly increase the production of resin phosphorus and NaHCO3-inorganic phosphorus, which can be directly utilized by plants. However, partial replacement of garden waste with cow manure had a significant synergistic effect, significantly increasing unstable phosphorus (mainly resin phosphorus + NaHCO3-inorganic phosphorus) and promoting the conversion of stable phosphorus to moderately unstable and unstable phosphorus, thereby improving phosphorus activation and utilization. See details. Figure 10-13 .

[0042] In summary, the present invention provides an organic soil conditioner and method for improving soil structural stability. Through the synergistic effect of physical conditioner components (earthworm castings of specific particle size) and chemical conditioner components (inorganic-organic synergistic phosphorus activating materials), it can improve degraded soil in landfills. The present invention can: (1) rapidly reduce soil pH, increase porosity, and significantly increase the content of available nutrients, especially phosphorus, that plants can directly utilize in a short period of time, meeting the needs of vegetation establishment; (2) significantly improve soil aggregate structure, increase microbial activity, and continuously promote the conversion of stable phosphorus, thereby enhancing soil ecological function. The present invention has both rapid and long-term effects, solves the problem of remediation of waste soil in landfills, provides an effective technical solution, and has significant ecological, social, and application promotion value.

Claims

1. An organic soil conditioner for improving soil structural stability, characterized in that, It includes physical amendment components and chemical amendment components; the physical amendment components are earthworm castings with a particle size of 0-2.5 mm or 2.5-5.0 mm; the chemical amendment components include inorganic base fertilizer and organic fertilizer, and the application mass ratio of organic fertilizer to inorganic base fertilizer is 50:1-40:

1.

2. The organic soil conditioner for improving soil structural stability according to claim 1, characterized in that, The earthworm castings are obtained by digesting and decomposing organic substrates from Eisenia fetida. The organic substrates are selected from one or more of cow dung, kitchen waste, and agricultural production residues. The earthworm castings are added at a ratio of 20%-30% of the volume of the soil to be improved, and the corresponding particle size is selected based on the needs for improving soil aggregate stability, enzyme activity enhancement, or fast-acting nutrient supplementation.

3. The organic soil conditioner for improving soil structural stability according to claim 2, characterized in that, Earthworm castings with a particle size of 0-2.5 mm are more conducive to increasing the content of available phosphorus and available potassium in the soil and urease activity, while earthworm castings with a particle size of 2.5-5.0 mm are more conducive to increasing the average weight diameter, geometric mean diameter and sucrase activity of soil aggregates.

4. The organic soil conditioner for improving soil structural stability according to claim 3, characterized in that, The inorganic base fertilizer is composed of superphosphate, calcium sulfate and elemental sulfur, with a mass ratio of 20-30:20-30:1; the amount of inorganic base fertilizer added is 2‰-4‰ of the quality of the soil to be improved.

5. An organic soil conditioner for improving soil structural stability according to claim 4, characterized in that, The organic fertilizer comprises one of the following two types: a single garden waste and a mixture of garden waste and cow manure, wherein the mass ratio of garden waste to cow manure is 1:0 to 5:1, and the amount of organic fertilizer added is 10%-15% of the quality of the soil to be improved.

6. The organic-inorganic composite amendment for simultaneously improving soil structural stability and available phosphorus content according to claim 5, characterized in that, The garden waste comes from fallen leaves and branches generated during garden maintenance. After being mechanically crushed, the particle size is less than 2cm, and it has not undergone composting treatment.

7. An organic soil conditioner for improving soil structural stability according to claim 6, characterized in that, The physical amendments improve soil physical stability by optimizing soil pore structure and providing a microenvironment for microbial attachment; the chemical amendments promote the conversion of stable phosphorus to active phosphorus in the soil through the synergistic effect of rapid phosphorus supply from inorganic base fertilizer and long-lasting release from organic fertilizer.

8. An organic soil conditioner for improving soil structural stability according to claim 7, characterized in that, The superphosphate is used to quickly replenish soil phosphorus. Calcium sulfate and elemental sulfur work synergistically to inhibit soil salinity and alkali toxicity and improve the utilization rate of superphosphate. Garden waste slowly releases mineral elements, and cow manure provides abundant organic matter and promotes the conversion of stable phosphorus to active phosphorus.

9. A method for improving soil structural stability using an organic amendment according to claims 1-8, characterized in that, This method is applicable to improving degraded soils that are unstructured, have low microbial activity, are phosphorus deficient, compacted and heavy, and have a high pH value. The degraded soils include landfill waste soil, urban waste soil, or barren and compacted farmland soil.

10. The method for improving soil structural stability using an organic amendment according to claim 9, characterized in that, After applying this method, the soil can achieve the following effects: (1) The pH value decreased by up to 13.0% compared to before the improvement; (2) The content of resin phosphorus and NaHCO3-inorganic phosphorus in the soil increased by 1.8-4.4 times compared with that before the improvement; (3) The soil phosphorus activation coefficient increased by up to 2.7 times, and the phosphorus use efficiency increased by 3.2-8.3 times; (4) The content of water-stable aggregates larger than 0.25 mm in the soil increased by more than 80.0% compared with that before the improvement; (5) The total porosity, organic matter content, and urease and sucrase activities of the soil were significantly improved compared with those before the improvement.

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