Saline-alkali soil conditioner and improvement method

Abstract

The invention belongs to the technical field of soil improvement, and particularly relates to a saline-alkali soil conditioner and an improvement method. The modifier is composed of SMT1-SMT5, wherein SMT1 is formed by compounding ammonium bicarbonate, ammonium carbonate and ammonia water according to the mass ratio of (4.5-5.5): (1.5-2.5): (0.8-1.2); sMT2 is prepared by compounding humic acid, fulvic acid, amino acid, chitin, water and an auxiliary material in a mass ratio of 2: 1: 1: 1: (5-6): (40-60); sMT3 is compounded by fungi, actinomycetes and water according to the mass ratio of 3: 1: (4-6); sMT4 is prepared by compounding cyanobacteria, cellulase, uricase, biochar and water according to the mass ratio of 3: 1: 1: 1: (3-5); sMT5 is compounded by gossypol, vegetable tannin and water according to the mass ratio of 3: 2: (4-6). According to the invention, SMT1-SMT5 synergistically improve the action effect of the modifier, and the modifier has a significant reduction effect on the pH, sodium ions and total salt content of saline-alkali soil.

Description

Technical Field

[0001] The invention belongs to the technical field of soil improvement, and in particular relates to a saline-alkali soil conditioner and an improvement method. Background Art

[0002] Soil salinization is a global problem that seriously affects agricultural production and the ecological environment. At present, soil salinization control technologies mainly include physical improvement, water conservancy improvement, chemical improvement and biological improvement. However, these methods have some defects and challenges in practical application.

[0003] Physical improvement: including measures such as leveling the land, deep plowing and drying the soil, which can improve soil structure, but requires large-scale disturbance of the surface, large engineering workload, high cost, and cannot fundamentally remove salt from the soil.

[0004] Water conservancy improvement: reduce soil salinity through irrigation and drainage matching, freshwater storage and salt suppression, etc. However, water resources are scarce in arid areas, and using a large amount of water resources for salt washing will aggravate water resource tension and affect the sustainable development of regional economy and ecology.

[0005] Chemical improvement: Using chemical substances such as gypsum and phosphogypsum to improve the soil can reduce soil salinity, but it also requires a lot of water resources and may introduce other chemical components that affect the soil ecosystem.

[0006] Biological improvement: The damage caused by salinization can be reduced to a certain extent by planting salt-tolerant plants and using microbial fertilizers, but the improvement effect is limited and requires long-term persistence.

[0007] The current status of soil salinization control technology shows that although existing soil improvement products can alleviate the salinization problem to a certain extent, there are still problems such as high cost, large water resource consumption and poor stability. Summary of the invention

[0008] The purpose of the present invention is to provide a saline-alkali soil conditioner and a method for improving the soil conditioner to solve the above technical problems. The present invention solves the above technical problems by the following technical means:

[0009] A saline-alkali soil conditioner, comprising SMT1 to SMT5, wherein:

[0010] SMT1 is prepared by mixing ammonium bicarbonate, ammonium carbonate and ammonia water in a mass ratio of 4.5-5.5:1.5-2.5:0.8-1.2;

[0011] SMT2 is compounded with humic acid, fulvic acid, amino acid, chitin, water and auxiliary materials in a mass ratio of 2:1:1:1:5-6:40-60;

[0012] SMT3 is a mixture of fungi, actinomycetes and water in a mass ratio of 3:1:4-6;

[0013] SMT4 is composed of cyanobacteria, cellulase, uricase, biochar and water in a mass ratio of 3:1:1:1:3-5;

[0014] SMT5 is a compound of cottonpol, plant tannins and water in a mass ratio of 3:2:4 to 6.

[0015] The saline-alkali soil conditioner of the present invention abandons the currently commonly used large-scale water washing and pressing of salt or single chemical or biological traditional saline-alkali land management model, and adopts a comprehensive management model combining physics, chemistry and biology, which reflects the synergistic effect of the mutual integration, mutual promotion and mutual superposition of physical, chemical and biological effects in the process of saline-alkali land management. The core is the intervention and regulation of the ecological function and production attributes of saline-alkali soil. Using five different functional improvers, a modular transformation model can be adopted to achieve the transformation of saline-alkali soil and restore the ecological function and production attributes of saline-alkali soil. It has low cost, low water resource consumption and high stability, and can effectively reduce the pH, sodium ions and total salt content of saline-alkali soil.

[0016] Furthermore, the auxiliary material is compounded by mass ratio of cottonseed hulls, peanut hulls, peat and cow dung.

[0017] Furthermore, the fungus is prepared by mixing yeast and silk fungus in equal weight ratio:

[0018] The yeast is prepared by mixing Saccharomyces cerevisiae, Rhodotorula and Candida in a mass ratio of 1 to 2:1:1.

[0019] The silk fungus is compounded by arbuscular mycorrhizal fungi, Pipetomycota mosseae and Rhizocystis endoradiata in a mass ratio of 1-2:0.5:1.

[0020] Furthermore, the actinomycetes are compounded by saprophytic actinomycetes, halotolerant Arthrobacter, Bacillus licheniformis and Frankia in a mass ratio of 1 to 2:1:1:1.

[0021] Based on the same inventive concept, the present invention also provides the use of the saline-alkali soil conditioner in improving saline-alkali soil.

[0022] Furthermore, the improvement includes reducing the pH, sodium ions and total salt content of saline-alkali soil.

[0023] Based on the same inventive concept, the present invention also provides a method for improving saline-alkali soil, using the saline-alkali soil conditioner to improve the saline-alkali soil. Before the saline-alkali soil is transformed, the soil indicators to be tested are first determined according to the characteristics of saline-alkali land in different regions, such as total salt content, salinity, soil pH, sodium, calcium, magnesium, carbonate, bicarbonate, sulfate and chloride ions in the soil, etc., and a soil testing plan is formulated to determine the degree of soil salinization. Then, a transformation plan for saline-alkali soil is formulated based on the saline-alkali soil test results. The method specifically includes the following steps:

[0024] S1. Use a large-scale deep tillage machine to first deep-till the soil to be transformed to a depth of 70 cm, and then use a large-scale rotary tillage equipment to rotary-till and level the deep-tilled soil, so that the deep-tilled soil to be transformed is in a soft and flat state, and sow SMT-1 in the soft and flat saline-alkali soil to be transformed, and use a large-scale rotary tillage equipment to evenly distribute the SMT-1 in the transformed soil;

[0025] The intervention of SMT-1 makes the NH 4 + Ions and HCO 3 + The increase of plasma has destroyed the dynamic balance of soluble salt ions in the soil, not only converting part of the sodium salt accumulated in the soil surface into ammonium salt, but also changing the acidity and alkalinity of the original salt. 3 + The presence of a large amount of ions makes a large amount of calcium and magnesium ions in the soil fixed, and more importantly, NH + 4 The presence of a large amount of ions, especially in an alkaline environment, further strengthens the nitrification in the soil. The strengthening of nitrification releases a large amount of H + ions, reducing the pH value of the soil, and on the other hand, releasing a large amount of nitrate nitrogen that is easily absorbed by crops, enhancing soil fertility. At the same time, the intervention of SMT-1 promotes the formation of soil aggregates and colloidal structures. The production of these flocculent structures, through ion exchange or adsorption, to a certain extent retards the biological nature of some soluble salt ions in the soil and reduces the electrical conductivity of the soil. In short, the intervention of SMT-1 breaks the dynamic balance of soluble salt ions in the soil, inhibits the biological nature of some soluble salt ions that play an important role in soil salinization, regulates the pH value of the soil, improves the soil ecology, and plays a leading role in subsequent transformation.

[0026] S2, 7-8 days later, spray SMT2 and deep plow the soil;

[0027] S3, 9-10 days later, spray SMT3 and deep plow the soil;

[0028] The intervention of SMT-2 and SMT-3 improved the survival status of the original microbial communities in the soil, optimized their living environment, activated the activity of dormant or passive microorganisms, stimulated the reproduction and growth of various microorganisms in the soil, accelerated the rapid growth of the types, biomass and biological activity of microorganisms in the soil, and caused mutations in cyanobacteria in the soil. The biomass of other microorganisms has undergone tremendous changes. The huge changes in the types, microbial mass and biological activity of microorganisms in the soil have caused tremendous changes in the microbial ecology of the soil. On the one hand, this change has greatly enhanced the degradation of soil organic matter by microorganisms, further strengthened the microbial ecology of the soil. At the same time, the metabolic activities of microorganisms have released a large amount of organic acids. The production of organic acids combined with the intervention of SMT-1 has a superimposed effect on the reduction of soil acidity and alkalinity, which has further improved the soil acidity and alkalinity. These changes have accelerated the formation of soil aggregate structure and further strengthened the vitality of the soil.

[0029] Therefore, the introduction of SMT-1, SMT-2, and SMT-3 modifiers promote and cooperate with each other, greatly improving the ecological function of saline-alkali soil.

[0030] S4, 9-10 days later, spray SMT4 and deep plow the soil;

[0031] S5. Sow SMT5 and deep plow the soil before sowing crops.

[0032] The formation of soil humus is divided into mineralization process and humification process, both of which are carried out under the action of microorganisms. The mineralization process is the process in which the animal and plant residues that enter the soil decompose complex organic matter into simple compounds that can be absorbed and utilized by crops with the participation of soil microorganisms. The humification process is the process in which the animal and plant residues that enter the soil are decomposed under the action of soil microorganisms and then condensed and polymerized into a series of dark brown high molecular organic compounds. The humification process will produce humic acid, mainly humin, humic acid, fuconic acid, etc. The intervention of SMT-4 and SMT-5 is mainly to inhibit the occurrence of soil pests and diseases that have an adverse effect on the growth of beneficial soil microorganisms, further improve the soil microbial ecology, and create a more favorable environment for the growth of soil microorganisms. Combined with the great promotion of soil microbial ecology by the intervention of SMT-2 and SMT-3, the intervention of SMT-4 and SMT-5 further accelerates the improvement and enhancement of soil microbial ecology, creates more favorable conditions for the growth of microorganisms, and causes a huge change in the biomass and vitality of soil microorganisms. The huge change in the biomass and vitality of soil microorganisms accelerates the humification and biodegradation of complex organic matter in the soil, and the production of humic acid (humin, humic acid, fucoidan, etc.) in the soil increases rapidly, and the pH value and ecological function of the soil are further optimized. The accumulation and superposition of this series of effects further strengthens the improvement of soil ecological functions and realizes the transformation of salinized soil.

[0033] As a preferred embodiment of the above method, the interval between spreading the improver can be appropriately adjusted according to the type of saline-alkali soil to be transformed, the degree of salinization, the regional environment, the weather, the season, etc., but the total transformation period must be controlled at about 50-60 days.

[0034] As a preferred embodiment of the above method, the dosage of SMT1 to SMT5 per mu of land is 450-550 kg, 20-60 kg, 30-70 kg, 20-60 kg, and 10-20 kg, respectively, and is adjusted according to the degree of soil salinization.

[0035] The present invention has the following beneficial effects:

[0036] 1) The soil conditioner and improvement method of the present invention break through the limitation of the traditional use of a single physical, chemical or biological method to transform saline-alkali land, and realize the interdependence, mutual coordination, mutual promotion and mutual superposition of physical processes, chemical processes and biological processes in the transformation of saline-alkali land.

[0037] 2) It breaks the dynamic chemical balance of the soil and stimulates the biological activity of the soil.

[0038] 3) This improvement method can transform salinized soil in one round with a short completion period.

[0039] 4) Maintain stability for a long time. One transformation can last at least 3-4 years and is suitable for the growth of a variety of crops.

[0040] 5) It has a wide range of applications. According to different regions and types of salinized soils, it only needs to properly adjust the dosage of the soil conditioner to achieve a good transformation effect.

[0041] 6) Dry operation has a simple process and combined with efficient irrigation management technology, it can ensure the efficient use of water resources in the process of saline-alkali land improvement and achieve stable and high yields in saline-alkali land.

[0042] 7) The cost is controllable. The cost of transformation per mu ranges from several thousand to tens of thousands of yuan, depending on the type and degree of salinity and other factors. Large-scale transformation can reduce the cost by about 10%-20%.

[0043] 8) The technology has obvious advantages and has been promoted and verified in Shaanxi Province, Ningxia Hui Autonomous Region, Shandong Province, Inner Mongolia Autonomous Region and other regions for a long time, with remarkable results. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 The present invention is a flow chart of improving saline-alkali soil. DETAILED DESCRIPTION

[0045] The present invention is described in detail below in conjunction with the accompanying drawings and specific examples, but should not be construed as limiting the present invention. Unless otherwise specified, the technical means used in the following examples are conventional means well known to those skilled in the art, and the materials, reagents, etc. used in the following examples, unless otherwise specified, can be obtained from commercial sources.

[0046] The sources of raw materials involved in the following examples are:

[0047] Amino acids: The trade name is Carbon Planet, amino acids ≥ 100 g / L, purchased from Shike Biotechnology (Shanghai) Co., Ltd.

[0048] The cyanobacteria were purchased from the Freshwater Algae Collection of Type Culture Collection Committee of the Chinese Academy of Sciences with the code number FACHB-181.

[0049] Saccharomyces cerevisiae was purchased from China Industrial Microbiological Culture Collection Center with the number CICC 32359.

[0050] Rhodotorula was purchased from China Industrial Microbiological Culture Collection Center with the code number CICC 32007.

[0051] Candida was purchased from China General Microbiological Culture Collection Center with the number CGMCC No.29215.

[0052] Arbuscular mycorrhizal fungi: The trade name is Purchased from Henan Zhengda Crop Protection Co., Ltd.

[0053] Pseudomonas mosseae was purchased from China General Microbiological Culture Collection Center with the number CGMCC No.3012.

[0054] Rhizospora intraradicata was purchased from Shanghai Jiachu Bioengineering Co., Ltd. with the catalog number HEB05.

[0055] Saprophytic actinomycetes were purchased from Qingdao High-Tech Industrial Park Haibo Biotechnology Co., Ltd. with the product number HB8550-1.

[0056] Arthrobacter halophilus was purchased from China General Microbiological Culture Collection Center with the number CGMCC No.20974.

[0057] Bacillus licheniformis was purchased from China Industrial Microbiological Culture Collection Center with the license number CICC 10099.

[0058] Frank's was purchased from Glaucophyte Biologicals, the catalog number is HZB172822.

[0059] Plant tannin is hydrolyzed tannin, CAS number: 1401-55-4.

[0060] Example 1

[0061] The soil conditioner of this embodiment is composed of SMT1 to SMT5, and the preparation method is as follows:

[0062] Accurately weigh each raw material and mix them according to the following mass ratio:

[0063] SMT1 is prepared by mixing ammonium bicarbonate, ammonium carbonate and ammonia water in a mass ratio of 5:2:1;

[0064] SMT2 is compounded with humic acid, fulvic acid, amino acid, chitin, water and auxiliary materials in a mass ratio of 2:1:1:1:5:50;

[0065] SMT3 is a mixture of fungi, actinomycetes and water in a mass ratio of 3:1:5;

[0066] SMT4 is composed of cyanobacteria, cellulase, uricase, biochar and water in a mass ratio of 3:1:1:1:4;

[0067] SMT5 is a mixture of cottonpol, plant tannins and water in a mass ratio of 3:2:5.

[0068] Among them, the auxiliary materials are a mixture of cottonseed hulls, peanut shells, peat and cow dung in equal mass ratios.

[0069] The fungi are composed of yeast and silk fungi in equal mass ratios:

[0070] The yeast is prepared by mixing Saccharomyces cerevisiae, Rhodotorula and Candida in a mass ratio of 2:1:1;

[0071] The silk fungus is compounded with arbuscular mycorrhizal fungi, Pipetomycota mosseae and Rhizocystis endoradiata in a mass ratio of 2:0.5:1.

[0072] The actinomycetes are compounded with saprophytic actinomycetes, Bacillus licheniformis and Frankia in a mass ratio of 2:1:1:1.

[0073] Example 2

[0074] The soil conditioner of this embodiment is composed of SMT1 to SMT5, and the preparation method is as follows:

[0075] Accurately weigh each raw material and mix them according to the following mass ratio:

[0076] SMT1 is prepared by mixing ammonium bicarbonate, ammonium carbonate and ammonia water in a mass ratio of 5:2:1;

[0077] SMT2 is compounded with humic acid, fulvic acid, amino acid, chitin, water and auxiliary materials in a mass ratio of 2:1:1:1:6:60;

[0078] SMT3 is a mixture of fungi, actinomycetes and water in a mass ratio of 3:1:5;

[0079] SMT4 is composed of cyanobacteria, cellulase, uricase, biochar and water in a mass ratio of 3:1:1:1:3;

[0080] SMT5 is a mixture of cottonpol, plant tannins and water in a mass ratio of 3:2:6.

[0081] Among them, the auxiliary materials are a mixture of cottonseed hulls, peanut shells, peat and cow dung in equal mass ratios.

[0082] The fungus is prepared by mixing yeast and silk fungus in equal weight ratios:

[0083] The yeast is prepared by mixing Saccharomyces cerevisiae, Rhodotorula and Candida in a mass ratio of 2:1:1;

[0084] The silk fungus is compounded with arbuscular mycorrhizal fungi, Pipetomycota mosseae and Rhizocystis endoradiata in a mass ratio of 2:0.5:1.

[0085] The actinomycetes are compounded with saprophytic actinomycetes, halotolerant Arthrobacter, Bacillus licheniformis and Frankia in a mass ratio of 2:1:1:1.

[0086] Example 3

[0087] The soil conditioner of this embodiment is composed of SMT1 to SMT5, and the preparation method is as follows:

[0088] Accurately weigh each raw material and mix them according to the following mass ratio:

[0089] SMT1 is prepared by mixing ammonium bicarbonate, ammonium carbonate and ammonia water in a mass ratio of 5:2:1;

[0090] SMT2 is compounded with humic acid, fulvic acid, amino acid, chitin, water and auxiliary materials in a mass ratio of 2:1:1:1:4:40;

[0091] SMT3 is a mixture of fungi, actinomycetes and water in a mass ratio of 3:1:5;

[0092] SMT4 is composed of cyanobacteria, cellulase, uricase, biochar and water in a mass ratio of 3:1:1:1:6;

[0093] SMT5 is a mixture of cottonpol, plant tannins and water in a mass ratio of 3:2:4.

[0094] Among them, the auxiliary materials are cottonseed hulls, peanut shells, peat and cow dung mixed in equal mass ratios.

[0095] The fungus is prepared by mixing yeast and silk fungus in equal weight ratios:

[0096] The yeast is prepared by mixing Saccharomyces cerevisiae, Rhodotorula and Candida in a mass ratio of 2:1:1;

[0097] The silk fungus is compounded with arbuscular mycorrhizal fungi, Pipetomycota mosseae and Rhizocystis endoradiata in a mass ratio of 2:0.5:1.

[0098] The actinomycetes are compounded with saprophytic actinomycetes, halotolerant Arthrobacter, Bacillus licheniformis and Frankia in a mass ratio of 2:1:1:1.

[0099] Comparative Example 1

[0100] In contrast to Example 1, the difference is that the improver consists of SMT1 to SMT4.

[0101] Comparative Example 2

[0102] In contrast to Example 1, the difference is that the improver consists of SMT1 to SMT3.

[0103] Comparative Example 3

[0104] In contrast to Example 1, the difference is that the improver consists of SMT2 to SMT5.

[0105] Comparative Example 4

[0106] In contrast to Example 1, the difference is that the improver consists of SMT3 to SMT5.

[0107] Application test

[0108] Overview of the test site:

[0109] The experiment was arranged in the No. 2 saline-alkali land (plot 1) of the National Saline-alkali Land Reconstruction Center in Dongying, Shandong Province and the saline-alkali land (plot 2) of the Luyang Lake Aviation Base in Pucheng. Before the transformation, the soil was stratified and sampled to test and analyze the saline-alkali type, composition, and indicators. The experiment set up an example group, a comparative group, and a blank control group, and the random block group arrangement was carried out.

[0110] like Figure 1 As shown, the test method of the present invention for improving saline-alkali soil is as follows:

[0111] S1. Use a large-scale deep tillage machine to first deep-till the soil to be transformed to a depth of 70 cm, and then use a large-scale rotary tillage equipment to rotary-till and level the deep-tilled soil, so that the deep-tilled soil to be transformed is in a soft and flat state, and sow SMT-1 in the soft and flat saline-alkali soil to be transformed, and use a large-scale rotary tillage equipment to evenly distribute the SMT-1 in the transformed soil;

[0112] S2: 7 days after SMT-1 is sown, spray SMT2 on the soil where SMT-1 has been sown and deep plow the soil;

[0113] S3: 10 days after the SMT-2 was sprayed, spray SMT3 on the soil sprayed with SMT-2 and deep plow the soil;

[0114] S4: 10 days after the SMT-3 was sprayed, spray SMT4 on the soil sprayed with SMT-3 and deep plow the soil;

[0115] S5: 7 days after SMT4 was sprayed, SMT5 was sown and the soil was deep-turned 3 days before crop sowing. The crop was corn.

[0116] The per-acre usage of SMT1~SMT5 for the improvement of No. 2 saline-alkali land in Shandong Dongying National Saline-alkali Land Renovation Center is 530kg, 50kg, 60kg, 60kg and 20kg respectively.

[0117] The usage per mu of saline-alkali land in Pucheng Luyang Lake Aviation Base is 500kg, 60kg, 40kg, 50kg and 20kg respectively.

[0118] The improvement effect of the soil conditioner of the present invention on the physical and chemical properties of the soil was further measured 70 days after the improvement.

[0119] Determination method

[0120] Acidity (pH): pH meter, determination of soil pH NY / T1377-2007.

[0121] Sodium ion: flame photometer, analysis of water-soluble salt content in forest soil LY / T1251-1999.

[0122] Total salt content: electronic balance, analysis of water-soluble salt content in forest soil LY / T1251-1999.

[0123] The results are shown in Table 1 and Table 2:

[0124] Table 1 Comparison of soil physical and chemical indicators before and after improvement of plot 1

[0125]

[0126]

[0127] Table 2 Comparison of soil physical and chemical indicators before and after improvement of plot 2

[0128] Group pH Sodium ion Total salt Example 1 7.4 0.26 1.7 Example 2 7.3 0.24 1.73 Example 3 7.5 0.25 1.72 Comparative Example 1 7.5 0.28 1.78 Comparative Example 2 8.0 0.46 2.23 Comparative Example 3 8.2 0.50 2.68 Comparative Example 4 8.9 0.86 5.64 Blank control 10.31 1.2 7.45

[0129] According to the data analysis of Table 1 and Table 2:

[0130] The soil conditioners of Examples 1 to 3 have significantly better effects on reducing the pH, sodium ions and total salt content of saline-alkali soil than the blank control.

[0131] Comparative Example 1 did not use SMT5, Comparative Example 2 did not use SMT4 and SMT5, and Comparative Example 4 did not use SMT1. Although Comparative Examples 1 to 4 also had a good effect of reducing the pH, sodium ions, and total salt content of saline-alkali soil, the effects were significantly reduced compared to Examples 1 to 3.

[0132] It should be noted that when the claims of the present invention involve numerical ranges, it should be understood that the two endpoints of each numerical range and any numerical value between the two endpoints can be selected. In order to avoid redundancy, the present invention describes a preferred embodiment.

[0133] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0134] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A saline-alkali soil conditioner, characterized in that: It consists of SMT1 to SMT5, among which: SMT1 is prepared by mixing ammonium bicarbonate, ammonium carbonate and ammonia water in a mass ratio of 4.5-5.5:1.5-2.5:0.8-1.2; SMT2 is compounded with humic acid, fulvic acid, amino acid, chitin, water and auxiliary materials in a mass ratio of 2:1:1:1:5-6:40-60; SMT3 is a mixture of fungi, actinomycetes and water in a mass ratio of 3:1:4-6; SMT4 is composed of cyanobacteria, cellulase, uricase, biochar and water in a mass ratio of 3:1:1:1:3-5; SMT5 is a compound of cottonpol, plant tannins and water in a mass ratio of 3:2:4 to 6.

2. The saline-alkali soil conditioner according to claim 1, characterized in that The auxiliary material is compounded by cottonseed hulls, peanut hulls, peat and cow dung in equal mass ratios.

3. The saline-alkali soil conditioner according to claim 1, characterized in that The fungus is prepared by mixing yeast and silk fungus in equal weight ratio.

4. The saline-alkali soil conditioner according to claim 3, characterized in that: The yeast is prepared by mixing Saccharomyces cerevisiae, Rhodotorula and Candida in a mass ratio of 1 to 2:1:

1. The silk fungus is compounded by arbuscular mycorrhizal fungi, Pipetomycota mosseae and Rhizocystis endoradiata in a mass ratio of 1-2:0.5:

1.

5. The saline-alkali soil conditioner according to claim 1, characterized in that: The actinomycetes are compounded by saprophytic actinomycetes, halotolerant Arthrobacter, Bacillus licheniformis and Frankia in a mass ratio of 1-2:1:1:

1.

6. Use of the saline-alkali soil conditioner according to any one of claims 1 to 5 in improving saline-alkali soil.

7. The use according to claim 6, wherein the improvement comprises reducing the pH, sodium ions and total salt content of saline-alkali soil.

8. A method for improving saline-alkali soil, characterized in that: The saline-alkali soil conditioner according to any one of claims 1 to 5 is used for soil improvement, and the method comprises the following steps: S1, deep plowing the soil to be improved until it is soft and flat, adding SMT1 and deep plowing the soil; S2, 7-8 days later, spray SMT2 and deep plow the soil; S3, 9-10 days later, spray SMT3 and deep plow the soil; S4, 9-10 days later, spray SMT4 and deep plow the soil; S5. Sow SMT5 and deep plow the soil before sowing crops.

9. The method for improving saline-alkali soil according to claim 8, characterized in that: The dosage per mu of SMT1 to SMT5 is 450-550kg, 20-60kg, 30-70kg, 20-60kg, and 10-20kg respectively.

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