Stabilizer for soil improvement and preparation method thereof

Abstract

The invention belongs to the technical field of soil improvement, and particularly relates to a stabilizer for soil improvement and a preparation method thereof. The stabilizer for soil improvement is prepared from the following raw materials in parts by weight: 10-15 parts of sodium polyacrylate, 10-15 parts of kaolin, 10-15 parts of diatomite, 7-10 parts of chitosan, 15-18 parts of alginic acid, 10-15 parts of a biological agent, 25-30 parts of wheat straw, 30-35 parts of cow dung and 10-15 parts of fly ash. The stabilizer for soil improvement increases the organic carbon content of soil, increases the microbial biomass carbon content of the soil, increases the total nitrogen content of the soil, and effectively improves the soil.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of soil improvement, and particularly relates to a stabilizer for soil improvement and a preparation method thereof. BACKGROUND

[0002] Soil, as a valuable resource for human survival and life, its nutrient content directly affects the soil quality. Soil nutrients refer to the necessary nutrient matrix for plant growth and development, which can comprehensively reflect the basic properties and essential characteristics of soil. The soil worldwide is facing great threats such as erosion, loss of organic carbon, nutrient imbalance, acidification, and compaction.

[0003] Taking effective improvement measures helps to protect soil quality and maintain the sustainable development of agriculture. At present, there are more studies on using a single modifier to improve soil, but there is still a lack of efficient composite modifier. In order to improve soil and improve soil properties, it is often added to soil such as biochar and fly ash, which has a certain effect, but the improvement effect is still insufficient and the duration is short.

[0004] Chinese patent CN116286004A discloses a saline-alkali soil modifier, a preparation method of the saline-alkali soil modifier, and a saline-alkali soil improvement method. The method adds a large amount of inorganic salt and other ingredients, which will break the balance of water and salt ions in the local soil in the long term, causing the content of certain salt ions in crops to be too high. The addition of these ingredients also greatly increases the cost of the soil modifier.

[0005] It is particularly important to find a soil improvement stabilizer that can improve soil organic carbon content, increase soil microbial biomass carbon content, and effectively improve soil performance. SUMMARY

[0006] The application aims to provide a stabilizer for soil improvement and a preparation method and application thereof. The stabilizer for soil improvement of the application improves soil organic carbon content, increases soil microbial biomass carbon content, and improves total nitrogen content of soil, and effectively improves soil.

[0007] In order to achieve the above-mentioned purpose, the application provides the following technical solutions:

[0008] The first object of the application is to provide a stabilizer for soil improvement.

[0009] The second object of the application is to provide a preparation method of the stabilizer for soil improvement.

[0010] The third object of the application is to provide the use of the stabilizer for soil improvement.

[0011] In order to achieve the first object, the technical solution adopted by the application is as follows:

[0012] The application provides a stabilizer for soil improvement, which is made of sodium polyacrylate, kaolin, diatomite, chitosan, alginic acid, biological bacterial agent, wheat straw, cow dung and fly ash.

[0013] In some embodiments, the stabilizer for soil improvement is made of the following raw materials in parts by weight: 10-15 parts of sodium polyacrylate, 10-15 parts of kaolin, 10-15 parts of diatomite, 7-10 parts of chitosan, 15-18 parts of alginic acid, 10-15 parts of biological bacterial agent, 25-30 parts of wheat straw, 30-35 parts of cow dung and 10-15 parts of fly ash.

[0014] In some embodiments, the stabilizer for soil improvement is made of the following raw materials in parts by weight: 12 parts of sodium polyacrylate, 12 parts of kaolin, 12 parts of diatomite, 8 parts of chitosan, 16 parts of alginic acid, 12 parts of biological bacterial agent, 28 parts of wheat straw, 32 parts of cow dung and 12 parts of fly ash.

[0015] In some embodiments, the biological bacterial agent is made of azotobacter, bacillus laterosporus, nitrifying bacteria and clostridium pasteurianum, and the microbial mass ratio of the azotobacter, bacillus laterosporus, bacillus thuringiensis and clostridium pasteurianum is 2-4:4-6:1-3:0.5-1, and the effective viable count of each bacterial agent in the azotobacter, bacillus laterosporus, bacillus thuringiensis and clostridium pasteurianum is greater than or equal to 1.0*10 9 cfu·g -1 , and the effective viable count of the composite bacterial agent is greater than or equal to 5.0*10 9 cfu·g -1 .

[0016] In some preferred embodiments, the microbial mass ratio of the azotobacter, bacillus laterosporus, bacillus thuringiensis and clostridium pasteurianum is 3:5:2:1.

[0017] To achieve the second object, the technical scheme adopted by the application is:

[0018] The preparation method of the stabilizer for soil improvement is as follows: (1) naturally air-drying the wheat straw, crushing and sieving; (2) uniformly mixing the biological bacterial agent; (3) mixing, grinding and mixing the sodium polyacrylate, kaolin, diatomite, chitosan, alginic acid, cow dung and fly ash, and then mixing with the wheat straw and the biological bacterial agent to obtain the stabilizer for soil improvement.

[0019] To achieve the third object, the technical scheme adopted by the application is:

[0020] The application provides the use of the stabilizer for soil improvement in the preparation of a stabilizer for soil improvement.

[0021] In some embodiments, the stabilizer for soil improvement increases soil organic carbon content.

[0022] In some embodiments, the stabilizer for soil improvement increases soil microbial biomass carbon content.

[0023] In some embodiments, the stabilizer for soil improvement increases soil total nitrogen content.

[0024] Through screening of a plurality of components, the stabilizer for soil improvement is provided by using sodium polyacrylate, kaolin, diatomite, chitosan, alginic acid, biological bacteria, wheat straw, cow dung and fly ash and the like in cooperation.

[0025] Compared with the prior art, the stabilizer for soil improvement has the following beneficial effects:

[0026] The experimental results show that the stabilizer of Example 1 has obvious effect on increasing soil organic carbon content, and the soil organic carbon content of 0-10 cm and 10-20 cm is increased by 54.3% and 46.0% respectively compared with the control group.

[0027] After using the stabilizer of Example 1, the soil microbial biomass carbon content of 0-10 cm and 10-20 cm is increased by 321.7% and 237.7% respectively compared with the control group, and after using the stabilizer of Example 2, the soil microbial biomass carbon content of 0-10 cm and 10-20 cm is increased by 288.1% and 238.1% respectively compared with the control group.

[0028] The stabilizer for soil improvement of the present application increases soil organic carbon content, increases soil microbial biomass carbon content, and increases soil total nitrogen content, and effectively improves soil. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 Comparison of soil total nitrogen content of 1-10 cm under different treatments, different lowercase letters above the column chart represent significant differences (P<0.05) between different groups.

[0030] Figure 2 Comparison of soil total nitrogen content of 10-20 cm under different treatments, different lowercase letters above the column chart represent significant differences (P<0.05) between different groups. DETAILED DESCRIPTION

[0031] The embodiments of the present application will be described in detail below with reference to the examples, but those skilled in the art will understand that the following examples are only used to illustrate the present application and should not be regarded as limiting the scope of the present application.

[0032] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention.

[0033] Example 1

[0034] 12 parts sodium polyacrylate, 12 parts kaolin, 12 parts diatomaceous earth, 8 parts chitosan, 16 parts alginate, 12 parts biological agent, 28 parts wheat straw, 32 parts cow dung, and 12 parts fly ash.

[0035] The mass ratio of the nitrogen-fixing bacteria, Bacillus lateralis, Bacillus thuringiensis, and Clostridium pasteurellii is 3:5:2:1.

[0036] The preparation method is as follows: (1) Dry wheat straw naturally, crush it and pass it through a 20-mesh sieve; (2) Mix biological agents evenly; (3) Mix sodium polyacrylate, kaolin, diatomaceous earth, chitosan, alginic acid, cow dung and fly ash, grind them, and then mix them with wheat straw and biological agents to obtain the stabilizer for soil improvement of the present invention.

[0037] Example 2

[0038] 10 parts sodium polyacrylate, 15 parts kaolin, 15 parts diatomaceous earth, 7 parts chitosan, 15 parts alginate, 15 parts biological agent, 25 parts wheat straw, 35 parts cow dung, and 15 parts fly ash.

[0039] The mass ratio of the nitrogen-fixing bacteria, Bacillus lateralis, Bacillus thuringiensis, and Clostridium pasteurellii is 2:4:1:1.

[0040] The preparation method is as follows: (1) Dry wheat straw naturally, crush it and pass it through a 20-mesh sieve; (2) Mix biological agents evenly; (3) Mix sodium polyacrylate, kaolin, diatomaceous earth, chitosan, alginic acid, cow dung and fly ash, grind them, and then mix them with wheat straw and biological agents to obtain the stabilizer for soil improvement of the present invention.

[0041] Example 3

[0042] 15 parts sodium polyacrylate, 10 parts kaolin, 10 parts diatomaceous earth, 10 parts chitosan, 18 parts alginate, 10 parts biological agent, 30 parts wheat straw, 30 parts cow dung, and 10 parts fly ash.

[0043] The mass ratio of the nitrogen-fixing bacteria, Bacillus lateralis, Bacillus thuringiensis, and Clostridium pasteurellii is 4:6:3:0.5.

[0044] The preparation method is as follows: (1) Dry wheat straw naturally, crush it and pass it through a 20-mesh sieve; (2) Mix biological agents evenly; (3) Mix sodium polyacrylate, kaolin, diatomaceous earth, chitosan, alginic acid, cow dung and fly ash, grind them, and then mix them with wheat straw and biological agents to obtain the stabilizer for soil improvement of the present invention.

[0045] Example 4

[0046] 12 parts sodium polyacrylate, 15 parts kaolin, 10 parts diatomaceous earth, 8 parts chitosan, 15 parts alginate, 10 parts biological agent, 25 parts wheat straw, 30 parts cow dung, and 15 parts fly ash.

[0047] The mass ratio of the nitrogen-fixing bacteria, Bacillus lateralis, Bacillus thuringiensis, and Clostridium pasteurellii is 4:4:3:0.5.

[0048] The preparation method is as follows: (1) Dry wheat straw naturally, crush it and pass it through a 20-mesh sieve; (2) Mix biological agents evenly; (3) Mix sodium polyacrylate, kaolin, diatomaceous earth, chitosan, alginic acid, cow dung and fly ash, grind them, and then mix them with wheat straw and biological agents to obtain the stabilizer for soil improvement of the present invention.

[0049] Example 5

[0050] 10 parts sodium polyacrylate, 12 parts kaolin, 12 parts diatomaceous earth, 10 parts chitosan, 18 parts alginate, 12 parts biological agent, 30 parts wheat straw, 30 parts cow dung, and 10 parts fly ash.

[0051] The mass ratio of the nitrogen-fixing bacteria, Bacillus lateralis, Bacillus thuringiensis, and Clostridium pasteurellii is 4:4:1:1.

[0052] The preparation method is as follows: (1) Dry wheat straw naturally, crush it and pass it through a 20-mesh sieve; (2) Mix biological agents evenly; (3) Mix sodium polyacrylate, kaolin, diatomaceous earth, chitosan, alginic acid, cow dung and fly ash, grind them, and then mix them with wheat straw and biological agents to obtain the stabilizer for soil improvement of the present invention.

[0053] Example 6

[0054] 10 parts sodium polyacrylate, 10 parts kaolin, 12 parts diatomaceous earth, 7 parts chitosan, 16 parts alginic acid, 15 parts biological agent, 28 parts wheat straw, 30 parts cow dung, and 12 parts fly ash.

[0055] The mass ratio of the nitrogen-fixing bacteria, Bacillus lateralis, Bacillus thuringiensis, and Clostridium pasteurellii is 4:6:3:0.5.

[0056] The preparation method is as follows: (1) Dry wheat straw naturally, crush it and pass it through a 20-mesh sieve; (2) Mix biological agents evenly; (3) Mix sodium polyacrylate, kaolin, diatomaceous earth, chitosan, alginic acid, cow dung and fly ash, grind them, and then mix them with wheat straw and biological agents to obtain the stabilizer for soil improvement of the present invention.

[0057] Example 7

[0058] 10 parts sodium polyacrylate, 15 parts kaolin, 12 parts diatomaceous earth, 10 parts chitosan, 15 parts alginate, 12 parts biological agent, 25 parts wheat straw, 32 parts cow dung, and 15 parts fly ash.

[0059] The mass ratio of the nitrogen-fixing bacteria, Bacillus lateralis, Bacillus thuringiensis, and Clostridium pasteurellii is 3:5:2:1.

[0060] The preparation method is as follows: Weigh each raw medicinal material, crush it, soak it in water for 1.5 hours, decoct it twice, each time adding water 5 times the total amount of medicinal materials, decoct for 0.5 hours each time, and combine the decoctions. The preparation method is as follows: (1) Air dry wheat straw naturally, crush it and pass it through a 20-mesh sieve; (2) Mix the biological agent evenly; (3) Mix sodium polyacrylate, kaolin, diatomaceous earth, chitosan, alginic acid, cow dung and fly ash, grind them, and then mix them with wheat straw and biological agent to obtain the stabilizer for soil improvement of the present invention.

[0061] Comparative Example 1

[0062] 24 parts kaolin, 12 parts diatomaceous earth, 8 parts chitosan, 16 parts alginic acid, 12 parts biological agent, 28 parts wheat straw, 32 parts cow dung, and 12 parts fly ash.

[0063] Compared to Example 1, the difference is that it does not contain sodium polyacrylate and the amount of kaolin is increased.

[0064] The preparation method is the same as in Example 1.

[0065] Comparative Example 2

[0066] 12 parts sodium polyacrylate, 12 parts kaolin, 12 parts diatomaceous earth, 8 parts chitosan, 22 parts alginic acid, 34 parts wheat straw, 32 parts cow dung, and 12 parts fly ash.

[0067] Compared with Example 1, the difference is that it does not contain biological agents and increases the amount of alginic acid and wheat straw.

[0068] The preparation method is the same as in Example 1.

[0069] Comparative Example 3

[0070] 12 parts sodium polyacrylate, 24 parts diatomaceous earth, 8 parts chitosan, 22 parts alginate, 12 parts biological agent, 28 parts wheat straw, 32 parts cow dung, and 12 parts fly ash.

[0071] Compared with Example 1, the difference is that it does not contain kaolin and the amount of diatomaceous earth is increased.

[0072] The preparation method is the same as in Example 1.

[0073] Comparative Example 4

[0074] 12 parts sodium polyacrylate, 12 parts kaolin, 12 parts diatomaceous earth, 8 parts chitosan, 16 parts alginate, 12 parts biological agent, 28 parts wheat straw, 32 parts cow dung, and 12 parts fly ash.

[0075] Compared with Example 1, the difference lies in the type of biological agent, which is composed of phosphate-solubilizing bacteria and Bacillus laterosporus in a mass ratio of 6:5.

[0076] The preparation method is the same as in Example 1.

[0077] Comparative Example 5

[0078] 12 parts sodium polyacrylate, 16 parts kaolin, 16 parts diatomaceous earth, 16 parts chitosan, 12 parts biological agent, 28 parts wheat straw, 32 parts cow dung, and 12 parts fly ash.

[0079] Compared with Example 1, the difference is that it does not contain alginate, and the amount of kaolin, diatomaceous earth and chitosan is increased.

[0080] The preparation method is the same as in Example 1.

[0081] Test Example 1: Study on the Effect of the Soil Conditioner and Stabilizer of the Present Invention

[0082] 1. Experimental Methods

[0083] A comparative field trial was conducted with eight treatments: control group (CK), Example 1 group (A), Example 2 group (B), Comparative Example 1 group (C), Comparative Example 2 group (D), Comparative Example 3 group (E), Comparative Example 4 group (F), and Comparative Example 5 group (G). Each treatment was replicated in triplicate, resulting in a total of 24 plots, each plot measuring 9 m. 2 .

[0084] Using the unstabilized test land as the control group, the AG group used the stabilizers prepared in Examples 1, 2, 1, 2, 3, 4, and 5, respectively, at an application rate of 18 t / hm². 2 .

[0085] The stabilizer was applied as a single basal application, thoroughly mixed with the 0-10cm soil layer, and all other field management practices were consistent. Corn was sown in May 2022 and harvested in September.

[0086] 2. Measurement Indicators

[0087] Harvesting concluded in September 2022. Soil samples were collected from plots under different treatment conditions, with stratified sampling at depths of 0-10 cm and 10-20 cm. Sampling points were taken in an "S" pattern, with 5 samples combined into one plot, and each plot was replicated three times. After collection, soil samples were sieved through a 2 mm soil analysis sieve and stored at 4°C for later use.

[0088] The total organic carbon content of the soil was determined by the potassium dichromate titration method, the microbial biomass carbon content was determined by the chloroform fumigation K2SO4 extraction method, and the total nitrogen content of the soil was determined by the semi-micro Kjeldahl method.

[0089] 3. Data Processing

[0090] Data processing was performed using Graphpad Prism 7.0 software, and the measurement data was presented in the following format: This indicates that one-way ANOVA was used for comparisons among multiple groups, and pairwise comparisons between groups were performed using SNK-q, with P < 0.05 considered statistically significant.

[0091] 4. Measurement Results

[0092] As shown in Table 1, compared with the control group (CK) without stabilizer, the stabilizer treatments in groups A and B increased soil organic carbon content. Group A showed the most significant effect in increasing soil organic carbon content, with increases of 54.3% and 46.0% in the 0-10 and 10-20 cm soil organic carbon content compared to the control group. Group B also showed a significant effect, with increases of 23.4% and 22.4% in the 0-10 and 10-20 cm soil organic carbon content compared to the control group. The effects of groups A and B in increasing soil organic carbon content were significantly better than those of groups C, D, E, F, and G.

[0093] Table 1. Soil organic carbon content (g / kg) under different treatments

[0094] Group 0-10 cm 10-20 cm CK group 1.39±0.05a 1.04±0.11a Group A 3.54±0.12b 2.33±0.12b Group B 3.43±0.21b 2.32±0.04b Group C 2.47±0.12c 1.47±0.12c Group D 2.33±0.08c 1.53±0.17c Group E 2.63±0.08c 1.52±0.17c Group F 2.46±0.23c 1.48±0.09c Group G 2.32±0.08c 1.46±0.11c

[0095] Note: Different lowercase letters indicate significant differences between different groups (P < 0.05).

[0096] As shown in Table 2, compared with the control group (CK) without stabilizer, the stabilizer treatments in groups A and B increased the soil microbial biomass carbon content. Group A showed the most significant increase in soil microbial biomass carbon content, with increases of 321.7% and 237.7% in the 0-10 and 10-20 cm depths, respectively, compared to the control group. Group B also showed a significant increase in soil microbial biomass carbon content, with increases of 288.1% and 238.1% in the 0-10 and 10-20 cm depths, respectively, compared to the control group. The effects of groups A and B in increasing soil microbial biomass carbon content were significantly better than those of groups C, D, E, F, and G.

[0097] Table 2. Soil microbial biomass carbon content (mg / kg) under different treatments

[0098] Group 0-10 cm 10-20 cm CK group 66.1±5.8a 50.9±3.8a Group A 345.0±12.5b 223.1±12.8b Group B 322.8±16.2b 223.3±11.9b Group C 218.0±8.0c 169.5±15.4c Group D 236.2±12.2c 180.6±17.6c Group E 233.7±9.3c 181.2±15.3c Group F 223.8±15.5c 182.7±18.2c Group G 227.1±20.7c 174.3±20.9c

[0099] Note: Different lowercase letters indicate significant differences between different groups (P < 0.05).

[0100] like Figure 1 , 2 As shown, compared with the control group (CK) without stabilizer application, the stabilizer treatments in groups A and B increased the total nitrogen content of the soil. Group A showed the most significant increase in total nitrogen content at depths of 0-10 and 10-20 cm, while group B also showed a significant increase in total nitrogen content at these depths. The effects of groups A and B in increasing total nitrogen content were significantly better than those in groups C, D, E, F, and G.

[0101] After the formulation of the soil amendment stabilizer in Comparative Examples 1-5 was changed, the effect of soil amendment deteriorated. The applicant believes that the components of the soil amendment stabilizer of the present invention have a synergistic effect, thereby achieving a significant improvement in the effect of soil amendment.

[0102] The stabilizer of this invention for soil improvement increases soil organic carbon content, increases soil microbial biomass carbon content, and increases soil total nitrogen content, effectively improving the soil and has broad application prospects.

[0103] The present invention has been described in detail above with general descriptions and specific embodiments. However, modifications or improvements can be made to the present invention, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A stabilizer for soil improvement, characterized in that, The stabilizer for soil improvement is made from the following raw materials in parts by weight: 10-15 parts sodium polyacrylate, 10-15 parts kaolin, 10-15 parts diatomaceous earth, 7-10 parts chitosan, 15-18 parts alginic acid, 10-15 parts biological agent, 25-30 parts wheat straw, 30-35 parts cow dung, and 10-15 parts fly ash.

2. The soil stabilizer according to claim 1, characterized in that, The stabilizer for soil improvement is made from the following raw materials in parts by weight: 12 parts sodium polyacrylate, 12 parts kaolin, 12 parts diatomaceous earth, 8 parts chitosan, 16 parts alginic acid, 12 parts biological agent, 28 parts wheat straw, 32 parts cow dung, and 12 parts fly ash.

3. A stabilizer for soil improvement, characterized in that, The stabilizer used for soil improvement is made from the following raw materials in parts by weight: 10 parts sodium polyacrylate, 15 parts kaolin, 15 parts diatomaceous earth, 7 parts chitosan, 15 parts alginate, 15 parts biological agent, 25 parts wheat straw, 35 parts cow dung, and 15 parts fly ash.

4. A stabilizer for soil improvement, characterized in that, The stabilizer used for soil improvement is made from the following raw materials in parts by weight: 15 parts sodium polyacrylate, 10 parts kaolin, 10 parts diatomaceous earth, 10 parts chitosan, 18 parts alginic acid, 10 parts biological agent, 30 parts wheat straw, 30 parts cow dung, and 10 parts fly ash.

5. The soil stabilizer according to any one of claims 1-4, characterized in that, The biological agent is composed of a mixture of nitrogen-fixing bacteria, Bacillus laterosporus, nitrifying bacteria, and Clostridium pasteurellium. The microbial mass ratio of nitrogen-fixing bacteria, Bacillus laterosporus, Bacillus thuringiensis, and Clostridium pasteurellium in the biological agent is 2-4:4-6:1-3:0.5-1. The effective viable count of each of the nitrogen-fixing bacteria, Bacillus laterosporus, Bacillus thuringiensis, and Clostridium pasteurellium in the agent is ≥1.0×10⁻⁶. 9 cfu·g -1 The effective viable count of the compound microbial agent is ≥5.0×10⁻⁶. 9 cfu·g -1 .

6. The soil stabilizer according to claim 5, characterized in that, The microbial mass ratio of the nitrogen-fixing bacteria, Bacillus lateralis, Bacillus thuringiensis, and Clostridium pasteurellis is 3:5:2:

1.

7. The soil stabilizer according to any one of claims 1-4, characterized in that, The method for preparing the stabilizer for soil improvement is as follows: (1) air-dry wheat straw, crush it and sieve it; (2) mix the biological agent evenly; (3) mix sodium polyacrylate, kaolin, diatomaceous earth, chitosan, alginic acid, cow dung and fly ash, grind them, and then mix them with wheat straw and biological agent to obtain the stabilizer for soil improvement of the present invention.

8. Use of the soil conditioner according to any one of claims 1-4 in the preparation of a soil conditioner stabilizer.

9. The use according to claim 8, characterized in that, The stabilizer used for soil improvement increases soil organic carbon content and improves soil total nitrogen content.

10. The use according to claim 8, characterized in that, The stabilizer used for soil improvement increases soil microbial biomass carbon content.

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