A carbon-based microbial granule for improving saline-alkali farmland and its preparation method and application

Abstract

The present invention belongs to the technical field of farmland improvement, and specifically relates to a carbon-based microbial granule for improving saline-alkali farmland, and a preparation method and application thereof. The present invention selects microorganisms Bacillus subtilis, Verticillium chlamydophyllum, Bacillus amyloliquefaciens, and Lactobacillus plantarum for improving saline-alkali farmland in different directions according to the characteristics of saline-alkali farmland, and combines them. The combined bacteria can significantly improve saline-alkali farmland relative to single bacteria; the combined bacteria are further made into granules, wherein polyacrylamide, which is both an adhesive and a common water-retaining agent, is added to lock soil moisture after rainfall and provide a suitable breeding environment for microorganisms. Sodium carboxymethyl cellulose is sprayed on the surface of the granules to improve the stability of the granules, so that the granules have a slow-release effect. On the basis of releasing microorganisms to improve saline-alkali farmland in the early stage, the microorganisms released in the later stage have higher activity and better improvement effect due to the improved saline-alkali farmland environment.

Description

Technical Field

[0001] The invention belongs to the technical field of farmland improvement, and specifically relates to a carbon-based microbial granule for improving saline-alkali farmland, and a preparation method and application thereof. Background Art

[0002] Saline-alkali farmland refers to farmland with a soluble salt content of more than 0.3% in the tillage layer or one meter of soil. Salinization of farmland will lead to an increase in the salt ion content in the soil, causing the farmland to become hardened, which is not conducive to water and fertilizer conservation, accelerates land desertification, and thus affects the normal growth of crops.

[0003] As part of land resources, saline-alkali farmland has significant ecological and social value if it is scientifically and rationally improved, developed and utilized. Currently, the commonly used methods for improving saline-alkali farmland include: irrigation to wash salt, deep tillage with added soil, physical method and chemical method. The above methods have the effect of improving the physical and chemical properties of soil to a certain extent, but they have the disadvantages of high cost, easy to cause secondary pollution and difficult to promote and use.

[0004] In recent years, the use of microorganisms to improve saline-alkali farmland has become a hot research direction in saline-alkali farmland improvement. Compared with other improvement methods such as irrigation to wash salt, deep tillage with added soil, physical methods, and chemical methods, microbial improvement has the characteristics of low cost, easy promotion, no secondary pollution, and relatively stable improvement effect. It has broad development prospects.

[0005] After searching, there are patents and non-patents in the prior art for improving saline-alkali land using microorganisms, such as CN110156537A discloses that extreme halophiles and Trichoderma are used to improve tidal flat saline-alkali land; CN112457128A discloses that Aspergillus glaucus, yellow-blue bacteria, pink polythecium, thick-walled Verticillium, crimson red rhodospirilla, Lactobacillus paracasei, Saccharomyces cerevisiae and Bacillus amyloliquefaciens are used in combination to improve saline-alkali land; CN118703362A discloses that Bacillus subtilis, Bacillus licheniformis, Bacillus laterus and Bacillus colloids are used in combination to improve saline-alkali land; CN118497069A discloses that Bacillus gelatinous, Bacillus megaterium, Burkholderia gladiolus and Pseudomonas aeruginosa are used in combination to improve saline-alkali land. Staphylococcus aureus combination is used to improve saline-alkali land; the literature (“Study on the Effect of Microbial Agents on the Physical, Chemical and Biological Properties of Saline-alkali Soil”, Pang Huancheng, et al., Journal of Agricultural and Environmental Sciences, 2009) discloses the effects of microbial agents on the physical, chemical and biological properties of saline-alkali soil, among which the agents contain potassium bacteria and Bacillus subtilis; the literature (“Microbial Screening of Saline-alkali Soil Remediation Agents”, Zhang Mi, et al., Journal of Agricultural and Environmental Sciences, 2022) discloses the microbial screening of saline-alkali soil remediation agents, and Bacillus megaterium and Bacillus amyloliquefaciens were screened out from 7 strains. They have strong extracellular polysaccharide production ability, and in saline-alkali soil, they have significant effects on promoting sunflower growth and improving soil, and can be used for the development of saline-alkali soil improvement agents. The literature (“Research on the Application of Microbial Fertilizer to Improve Saline-alkali Land”, Chen Lu, et al., Grass Science, 2023) discloses the progress of application research on microbial fertilizer to improve saline-alkali land.

[0006] It can be seen that although the prior art discloses the use of microorganisms for improving saline-alkali farmland or saline-alkali land, there is no prior art that targets the characteristics of saline-alkali farmland, screens specific microorganisms for combination, and prepares the microorganisms into granules. The present invention targets the characteristics of saline-alkali farmland, screens microorganisms for improving saline-alkali land in different directions from Bacillus subtilis, Verticillium chlamydophorum, Bacillus megaterium, Bacillus amyloliquefaciens, Bacillus licheniformis, Brevibacillus laterosporus, Lactobacillus paracasei, Lactobacillus plantarum, Bacillus mucilaginosus, Burkholderia gladiolus, Xanthocyanobacterium, Staphylococcus pseudoxylosus, and Saccharomyces cerevisiae, and combines the microorganisms into granules. The combined bacteria can significantly improve saline-alkali farmland compared to single bacteria. The combined bacteria are further made into granules, to which polyacrylamide, which is both a binder and a common water-retaining agent, is added to lock in soil moisture after rainfall and provide a suitable breeding environment for microorganisms. In addition, sodium carboxymethyl cellulose is sprayed on the surface of the granules, which not only improves the stability of the granules, but also gives the granules a slow-release effect. On the basis of the early release of microorganisms to improve the saline-alkali farmland, the microorganisms released in the later stage can have higher activity and better improvement effect because they face the improved saline-alkali farmland environment. Summary of the invention

[0007] On one hand, the present invention provides a charcoal-based microbial granule for improving saline-alkali farmland, comprising the following raw materials in parts by weight: 0.2-1 parts by weight of mixed bacterial powder consisting of Bacillus subtilis powder, Verticillium chlamydophorum powder, Bacillus amyloliquefaciens powder and Lactobacillus plantarum powder, 60-150 parts by weight of charcoal powder, 4-6 parts by weight of adhesive polyacrylamide, 6-8 parts by weight of adhesive corn starch, 2-4 parts by weight of sodium carboxymethyl cellulose and 15-25 parts by weight of water;

[0008] The mass ratio of Bacillus subtilis powder, Verticillium chlamydophorum powder, Bacillus amyloliquefaciens powder and Lactobacillus plantarum powder is 1-2:1-3:1-2:1-2.

[0009] Preferably, the mixed bacterial powder is 0.2 parts by weight.

[0010] Preferably, charcoal powder is 60 parts by weight.

[0011] Preferably, the adhesive polyacrylamide is 4 parts by weight.

[0012] Preferably, the adhesive is 6 parts by weight of corn starch.

[0013] Preferably, 2 parts by weight of sodium carboxymethyl cellulose.

[0014] A charcoal-based microbial granule for improving saline-alkali farmland, comprising the following raw materials in parts by weight: 0.2 parts by weight of a mixed bacterial powder consisting of Bacillus subtilis powder, Verticillium chlamydophorum powder, Bacillus amyloliquefaciens powder, and Lactobacillus plantarum powder, 60 parts by weight of charcoal powder, 4 parts by weight of a binder polyacrylamide, 6 parts by weight of a binder corn starch, 2 parts by weight of sodium carboxymethyl cellulose, and 15 parts by weight of water;

[0015] The mass ratio of Bacillus subtilis powder, Verticillium chlamydophorum powder, Bacillus amyloliquefaciens powder and Lactobacillus plantarum powder is 1:1:1:1.

[0016] A carbon-based microbial granule for improving saline-alkali farmland, comprising the following raw materials in parts by weight:

[0017] 1 part by weight of a mixed bacterial powder consisting of Bacillus subtilis powder, Verticillium chlamydophorum powder, Bacillus amyloliquefaciens powder and Lactobacillus plantarum powder, 150 parts by weight of charcoal powder, 6 parts by weight of a binder polyacrylamide, 8 parts by weight of a binder corn starch, 4 parts by weight of sodium carboxymethyl cellulose and 25 parts by weight of water;

[0018] The mass ratio of Bacillus subtilis powder, Verticillium chlamydophorum powder, Bacillus amyloliquefaciens powder and Lactobacillus plantarum powder is 2:3:2:2.

[0019] The second aspect of the present invention provides the use of the aforementioned carbon-based microbial granules for improving saline-alkali farmland in improving saline-alkali farmland.

[0020] The third aspect of the present invention provides a method for preparing the aforementioned carbon-based microbial granules for improving saline-alkali farmland, comprising the following steps:

[0021] (1) preparing a mixture of Bacillus subtilis powder, Verticillium chlamydophorum powder, Bacillus amyloliquefaciens powder, and Lactobacillus plantarum powder, charcoal powder, a binder of polyacrylamide, a binder of corn starch, sodium carboxymethyl cellulose, and water according to the formula weight parts;

[0022] (2) dissolving the binder polyacrylamide in water and dissolving sodium carboxymethyl cellulose in water to prepare a polyacrylamide solution and a sodium carboxymethyl cellulose solution respectively;

[0023] (3) mixing a mixed bacterial powder consisting of Bacillus subtilis powder, Verticillium chlamydophorum powder, Bacillus amyloliquefaciens powder, and Lactobacillus plantarum powder with a binder of corn starch and charcoal powder, and then adding a polyacrylamide solution;

[0024] (4) granulating and screening the product obtained in step (3) at low temperature to obtain granules;

[0025] (5) After spraying the sodium carboxymethyl cellulose solution on the surface of the granules obtained in step (4), low-temperature drying is performed to obtain carbon-based microbial granules for improving saline-alkali farmland.

[0026] The fourth aspect of the present invention provides a carbon-based microbial granule for improving saline-alkali farmland prepared by the aforementioned method.

[0027] A fifth aspect of the present invention provides the use of the carbon-based microbial granules for improving saline-alkali farmland prepared by the aforementioned preparation method in improving saline-alkali farmland.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] (1) In view of the characteristics of saline-alkali farmland, the present invention selects microorganisms Bacillus subtilis, Verticillium chlamydophyllum, Bacillus megaterium, Bacillus amyloliquefaciens, Bacillus licheniformis, Brevibacillus laterosporus, Lactobacillus paracasei, Lactobacillus plantarum, Bacillus mucilaginosus, Burkholderia gladiolus, Xanthocyanobacterium, Staphylococcus pseudoxylosus and Saccharomyces cerevisiae to improve saline-alkali land in different directions.

[0030] (2) The present invention combines Bacillus subtilis, Verticillium chlamydophorum, Bacillus amyloliquefaciens and Lactobacillus plantarum. Compared with a single bacterium, the combined bacteria can significantly improve saline-alkali farmland.

[0031] (3) The present invention further prepares the combined bacteria into granules, to which polyacrylamide, which is both a binder and a common water-retaining agent, is added, which can lock in soil moisture after rainfall and provide a suitable breeding environment for microorganisms.

[0032] (4) The present invention sprays sodium carboxymethyl cellulose on the surface of the granules, which, on the one hand, improves the stability of the granules, and on the other hand, makes the granules have a sustained-release effect. On the basis of the early release of microorganisms to improve saline-alkali farmland, the microorganisms released later can have higher activity and better improvement effect due to the improved saline-alkali farmland environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 The carbon-based microbial granules for improving saline-alkali farmland prepared in Example 4.

[0034] Figure 2 This is a microscopic electron microscope image of the carbon-based microbial granules for improving saline-alkali farmland prepared in Example 4.

[0035] Figure 3 The present invention is a device for preparing the carbon-based microbial granules for improving saline-alkali farmland in Example 4.

[0036] Figure 4 This is a diagram showing the effects of the treatment group and the control group in Example 6 on corn planting.

[0037] Figure 5 This is a diagram showing the effects of the treatment group and the control group in Example 6 on rice planting.

[0038] Figure 6 This is a diagram showing the effect of corn planting in Example 1.

[0039] Figure 7 This is a photo of corn planting in the test field of Example 1. DETAILED DESCRIPTION

[0040] The specific implementation of the present invention is described below with reference to the accompanying drawings. The experimental methods used in the implementation examples are all conventional methods unless otherwise specified; the materials and reagents used are all commercially available unless otherwise specified.

[0041] Example 1

[0042] Bacillus subtilis, Verticillium chlamydophorum, Bacillus megaterium, Bacillus amyloliquefaciens, Bacillus licheniformis, Bacillus laterosporus, Brevibacillus laterosporus, Lactobacillus paracasei, Bacillus mucilaginosus, Burkholderia gladiolus, Xanthocyanobacterium, Staphylococcus pseudoxylosus, as well as bacterial powder and Saccharomyces cerevisiae, which are common in the art, were selected to study the effects of different microorganisms on soil organic matter content, soil pH, soil salt content, available phosphorus and available potassium in saline-alkali cultivated land.

[0043] The pH, available potassium, available phosphorus, alkaline nitrogen, and salt content of the soil were determined according to the method in Section 1 of the reference (“Microbial Screening of Saline-Alkali Soil Remediation Agents”, Zhang Mi, et al., Journal of Agricultural Environment Science, 2022).

[0044] The experiment was carried out in salinized farmland in Jinhe Town, Saihan District, Hohhot. The test soil organic matter content was 13.76g / kg, soil pH was 8.86, soil salt content was 3.49g / kg, available phosphorus was 10.76mg / kg, and available potassium was 86.02mg / kg.

[0045] Experimental method: Microorganisms Bacillus subtilis, Verticillium chlamydophorum, Bacillus megaterium, Bacillus amyloliquefaciens, Bacillus licheniformis, Bacillus brevis laterosporus, Lactobacillus paracasei, Lactobacillus plantarum, Bacillus mucilaginosus, Burkholderia gladiolus, Xanthomonas aureus, Staphylococcus pseudoxylosus, and Saccharomyces cerevisiae powder were mixed with charcoal powder to obtain a mixture of microorganisms and charcoal powder, wherein the mass ratio of each microorganism to charcoal powder was 0.2:60, and the concentration of each microorganism was 6.5×10 6 CFU / g.

[0046] The saline-alkali farmland was divided into 13 parts, and a mixture of Bacillus subtilis, Verticillium chlamydophorum, Bacillus megaterium, Bacillus amyloliquefaciens, Bacillus licheniformis, Brevibacillus laterosporus, Lactobacillus paracasei, Lactobacillus plantarum, Bacillus mucilaginosus, Burkholderia gladiolus, Xanthocyanobacterium, Staphylococcus pseudoxylosus, Saccharomyces cerevisiae and charcoal powder was inoculated in sequence, and the addition amount of the mixture was 2.5 kg of the mixture / 100 square meters of the saline-alkali farmland. After inoculation for half a year, the soil organic matter content, soil pH, soil salt content, available phosphorus and available potassium in the soil were measured, as shown in Table 1. The saline-alkali farmland was subsequently used for planting corn, such as Figure 6 and Figure 7 shown.

[0047] Table 1 Effects of different microorganisms on saline-alkali farmland improvement

[0048]

[0049] As can be seen from Table 1, the improvement effects of different mixtures of microorganisms and charcoal powder on saline-alkali farmland are quite different. Compared with the mixtures of Bacillus megaterium, Bacillus licheniformis, Brevibacillus laterosporus, Lactobacillus paracasei, Bacillus mucilaginosus, Burkholderia gladiolus, Flavescent blue bacteria, Staphylococcus pseudoxylosus, and Saccharomyces cerevisiae with charcoal powder, the mixtures of Bacillus subtilis, Verticillium chlamydophyllum, Bacillus amyloliquefaciens, and Lactobacillus plantarum with charcoal powder have relatively better improvement effects on saline-alkali farmland. Among them, Bacillus subtilis and Bacillus amyloliquefaciens are better at improving the salt content of saline-alkali farmland soil, Verticillium chlamydophyllum is better at improving the soil organic matter content, available phosphorus, and available potassium of saline-alkali farmland soil, and Lactobacillus plantarum is better at improving the pH of saline-alkali farmland soil. Therefore, Bacillus subtilis, Verticillium chlamydophyllum, Bacillus amyloliquefaciens, and Lactobacillus plantarum are selected as microbial agents for improving saline-alkali farmland.

[0050] Example 2

[0051] The microorganism Bacillus subtilis powder, Verticillium chlamydophora powder, Bacillus amyloliquefaciens powder and Lactobacillus plantarum powder were uniformly mixed to obtain a mixed bacterial powder, wherein the mass ratio of Bacillus subtilis powder, Verticillium chlamydophora powder, Bacillus amyloliquefaciens powder and Lactobacillus plantarum powder was 1:1:1:1:1, and then the mixed bacterial powder was uniformly mixed with charcoal powder to obtain a mixture of mixed bacterial powder and charcoal powder, wherein the mass ratio of the mixed bacterial powder to the charcoal powder was 0.2:60, and the concentration of the mixed bacterial powder was 6.5×10 6 CFU / g.

[0052] The same saline-alkali farmland as in Example 1 was inoculated with a mixture of mixed bacterial powder and charcoal powder, wherein the addition amount of the mixture was 2.5 kg of the mixture / 100 square meters of saline-alkali farmland. The soil organic matter content, soil pH, soil salt content, available phosphorus, and available potassium in the soil were measured six months after inoculation, as shown in Table 2. The saline-alkali farmland was subsequently used to grow corn.

[0053] Table 2 Effects of different microorganisms and their combinations on saline-alkali farmland improvement

[0054]

[0055] As can be seen from Table 2, the combination of Bacillus subtilis, Verticillium chlamydophyllum, Bacillus amyloliquefaciens and Lactobacillus plantarum can significantly improve the soil organic matter content, soil pH, soil salt content, available phosphorus, available potassium and other values ​​in saline-alkali cultivated soil compared with single Bacillus subtilis, Verticillium chlamydophyllum, Bacillus amyloliquefaciens and Lactobacillus plantarum (data in Example 1). The possible reason is that the mixed bacteria can improve the soil in different directions. For example, the reduction of soil pH and salt content will in turn further activate the reproductive performance of other microorganisms. Therefore, different microorganisms have a certain synergistic effect as a whole.

[0056] Example 3

[0057] A carbon-based microbial granule for improving saline-alkali farmland, comprising the following raw materials in parts by weight:

[0058] 0.2 parts by weight of a mixed bacterial powder consisting of Bacillus subtilis powder, Verticillium chlamydophorum powder, Bacillus amyloliquefaciens powder and Lactobacillus plantarum powder, 60 parts by weight of charcoal powder, 4 parts by weight of a binder polyacrylamide, 6 parts by weight of a binder corn starch, 2 parts by weight of sodium carboxymethyl cellulose and 15 parts by weight of water;

[0059] The mass ratio of Bacillus subtilis powder, Verticillium chlamydophorum powder, Bacillus amyloliquefaciens powder and Lactobacillus plantarum powder is 1:1:1:1.

[0060] The preparation method comprises the following steps:

[0061] (1) preparing a mixture of Bacillus subtilis powder, Verticillium chlamydophorum powder, Bacillus amyloliquefaciens powder, and Lactobacillus plantarum powder, charcoal powder, a binder of polyacrylamide, a binder of corn starch, sodium carboxymethyl cellulose, and water according to the formula weight parts;

[0062] (2) first dissolving the binder polyacrylamide in water and dissolving sodium carboxymethyl cellulose in water to prepare a polyacrylamide solution and a sodium carboxymethyl cellulose solution respectively;

[0063] (3) mixing a mixed bacterial powder consisting of Bacillus subtilis powder, Verticillium chlamydophorum powder, Bacillus amyloliquefaciens powder, and Lactobacillus plantarum powder with a binder of corn starch and charcoal powder, and then adding a polyacrylamide solution;

[0064] (4) granulating and screening the product obtained in step (3) at low temperature to obtain granules;

[0065] (5) After spraying the sodium carboxymethyl cellulose solution on the surface of the granules obtained in step (4), low-temperature drying is performed to obtain carbon-based microbial granules for improving saline-alkali farmland.

[0066] Sodium carboxymethyl cellulose is sprayed on the surface of the granules, which not only improves the stability of the granules, but also makes the granules have a sustained-release effect. On the basis of the early release of microorganisms to improve saline-alkali farmland, the microorganisms released later can be more active and have better improvement effects because they are facing the improved saline-alkali farmland environment.

[0067] Example 4

[0068] A carbon-based microbial granule for improving saline-alkali farmland, comprising the following raw materials in parts by weight:

[0069] 1 part by weight of a mixed bacterial powder consisting of Bacillus subtilis powder, Verticillium chlamydophorum powder, Bacillus amyloliquefaciens powder and Lactobacillus plantarum powder, 150 parts by weight of charcoal powder, 6 parts by weight of a binder polyacrylamide, 8 parts by weight of a binder corn starch, 4 parts by weight of sodium carboxymethyl cellulose and 25 parts by weight of water;

[0070] The mass ratio of Bacillus subtilis powder, Verticillium chlamydophorum powder, Bacillus amyloliquefaciens powder and Lactobacillus plantarum powder is 2:3:2:2.

[0071] The preparation method is the same as Example 3.

[0072] Example 5

[0073] The same saline-alkali farmland as in Example 1 was inoculated with the carbon-based microbial granules for improving the saline-alkali farmland in Example 3 and Example 4, wherein the addition amount of the carbon-based microbial granules was 2.5 kg granules / 100 square meters of saline-alkali farmland. The soil organic matter content, soil pH, soil salt content, available phosphorus, and available potassium in the soil were measured half a year after inoculation, as shown in Table 3. The saline-alkali farmland was subsequently used to grow corn.

[0074] Table 3 Effects of microbial combinations and carbon-based microbial granules on saline-alkali farmland improvement

[0075]

[0076] As can be seen from Table 3, when the microbial agents and the ratios are the same, the microorganisms are made into granules and sodium carboxymethyl cellulose is sprayed on the surface. Compared with the simple mixing of Bacillus subtilis, Verticillium chlamydophorum, Bacillus amyloliquefaciens, Lactobacillus plantarum and charcoal powder in Example 2, the effect of microorganisms on improving soil organic matter content, soil pH, soil salt content, available phosphorus and available potassium in the soil can be significantly improved. The possible reason is that polyacrylamide is both an adhesive and a common water-retaining agent, which can lock soil moisture after rainfall and provide a suitable breeding environment for microorganisms. In addition, sodium carboxymethyl cellulose is sprayed on the surface of the granules, so that the granules have a slow-release effect. On the basis of releasing microorganisms in the early stage to improve saline-alkali farmland, the microorganisms released in the later stage can have higher activity and better improvement effect due to the improved saline-alkali farmland environment.

[0077] Example 6

[0078] The charcoal-based microbial granules for improving saline-alkali farmland prepared in Example 4 (treatment group) and the mixture of Bacillus subtilis + Verticillium chlamydophyllum + Bacillus amyloliquefaciens + Lactobacillus plantarum + charcoal powder prepared in Example 2 (control group) were applied to saline-alkali farmland planted with corn and saline-alkali farmland planted with rice, wherein the addition amount of the charcoal-based microbial granules was 2.5 kg granules / 100 square meters of saline-alkali farmland. The growth effects of corn and rice were as follows: Figure 4 and Figure 5 shown.

[0079] according to Figure 4 and Figure 5 It can be seen that the addition of carbon-based microbial granules can significantly improve the plant height and thickness of corn and rice and promote root growth.

[0080] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Anyone familiar with this technology can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the definition of the claims.

Claims

1. A carbon-based microbial granule for improving saline-alkali farmland, characterized in that: The carbon-based microbial granules are composed of the following raw materials in parts by weight: 0.2-1 parts by weight of a mixed bacterial powder consisting of Bacillus subtilis powder, Verticillium chlamydophorum powder, Bacillus amyloliquefaciens powder and Lactobacillus plantarum powder, 60-150 parts by weight of charcoal powder, 4-6 parts by weight of a binder polyacrylamide, 6-8 parts by weight of a binder corn starch, 2-4 parts by weight of sodium carboxymethyl cellulose, and 15-25 parts by weight of water; The mass ratio of Bacillus subtilis powder, Verticillium chlamydophorum powder, Bacillus amyloliquefaciens powder and Lactobacillus plantarum powder is 1-2:1-3:1-2:1-2; The preparation method thereof comprises the following steps: (1) preparing a mixture of Bacillus subtilis powder, Verticillium chlamydophorum powder, Bacillus amyloliquefaciens powder, and Lactobacillus plantarum powder, charcoal powder, a binder of polyacrylamide, a binder of corn starch, sodium carboxymethyl cellulose, and water according to the formula weight parts; (2) dissolving the binder polyacrylamide in water and dissolving sodium carboxymethyl cellulose in water to prepare a polyacrylamide solution and a sodium carboxymethyl cellulose solution respectively; (3) mixing a mixed bacterial powder consisting of Bacillus subtilis powder, Verticillium chlamydophorum powder, Bacillus amyloliquefaciens powder, and Lactobacillus plantarum powder with a binder of corn starch and charcoal powder, and then adding a polyacrylamide solution; (4) granulating and screening the product obtained in step (3) at low temperature to obtain granules; (5) After spraying the sodium carboxymethyl cellulose solution on the surface of the granules obtained in step (4), low-temperature drying is performed to obtain carbon-based microbial granules for improving saline-alkali farmland.

2. The carbon-based microbial granules for improving saline-alkali farmland according to claim 1, characterized in that: The mixed bacterial powder is 0.2 parts by weight.

3. The carbon-based microbial granules for improving saline-alkali farmland according to claim 1, characterized in that: The charcoal powder is 60 parts by weight.

4. The carbon-based microbial granules for improving saline-alkali farmland according to claim 1, characterized in that: The adhesive polyacrylamide is 4 parts by weight.

5. The carbon-based microbial granules for improving saline-alkali farmland according to claim 1, characterized in that: The adhesive is 6 parts by weight of corn starch.

6. The carbon-based microbial granules for improving saline-alkali farmland according to claim 1, characterized in that: The sodium carboxymethyl cellulose is 2 parts by weight.

7. The carbon-based microbial granules for improving saline-alkali farmland according to claim 1, characterized in that: The carbon-based microbial granules include the following raw materials in parts by weight: 0.2 parts by weight of mixed bacterial powder consisting of Bacillus subtilis powder, Verticillium chlamydophorum powder, Bacillus amyloliquefaciens powder, and Lactobacillus plantarum powder, 60 parts by weight of charcoal powder, 4 parts by weight of adhesive polyacrylamide, 6 parts by weight of adhesive corn starch, 2 parts by weight of sodium carboxymethyl cellulose, and 15 parts by weight of water; The mass ratio of Bacillus subtilis powder, Verticillium chlamydophorum powder, Bacillus amyloliquefaciens powder and Lactobacillus plantarum powder is 1:1:1:

1.

8. The carbon-based microbial granules for improving saline-alkali farmland according to claim 1, characterized in that: The carbon-based microbial granules include the following raw materials in parts by weight: 1 part by weight of a mixed bacterial powder consisting of Bacillus subtilis powder, Verticillium chlamydophorum powder, Bacillus amyloliquefaciens powder and Lactobacillus plantarum powder, 150 parts by weight of charcoal powder, 6 parts by weight of a binder polyacrylamide, 8 parts by weight of a binder corn starch, 4 parts by weight of sodium carboxymethyl cellulose and 25 parts by weight of water; The mass ratio of Bacillus subtilis powder, Verticillium chlamydophorum powder, Bacillus amyloliquefaciens powder and Lactobacillus plantarum powder is 2:3:2:

2.

9. Use of the carbon-based microbial granules for improving saline-alkali farmland according to any one of claims 1 to 8 in improving saline-alkali farmland.

Images