Microbial agent and organic fertilizer composite alkaline soil improver and preparation method thereof

Abstract

The invention belongs to the technical field of soil amendments, and particularly relates to a microbial agent and organic fertilizer composite alkaline soil amendment and a preparation method thereof. The microbial agent and organic fertilizer composite alkaline soil improver is prepared from the following components in parts by weight: 30 to 35 parts of organic fertilizer, 5 to 10 parts of modified attapulgite, 13 to 18 parts of humic acid, 20 to 25 parts of medicine residue compost, 3 to 6 parts of microbial agent and 2 to 5 parts of water-retaining agent. The microbial agent and organic fertilizer composite alkaline soil improver can improve the physicochemical properties of alkaline soil, and can increase the yield of beet at the same time.

Description

Technical Field

[0001] The invention belongs to the technical field of alkaline soil improvers, and in particular relates to a microbial agent and organic fertilizer composite alkaline soil improver and a preparation method thereof. Background Art

[0002] As an important raw material crop for sugar production in northern my country, sugar beets are widely planted in inland alkaline areas due to their strong alkali resistance and good economic benefits. However, sugar beets have a large demand for fertilizers, have strong absorption capacity and a long fertilizer absorption cycle. Farmers often lack scientific guidance in the fertilization process, resulting in inaccurate fertilizer use and unbalanced nutrient supply.

[0003] At present, a large number of patent technologies for chemical improvement of alkaline soil have emerged. For example, patent CN201610015655.5 provides an alkaline soil conditioner and its preparation method and application, which includes the following components by weight: 1-15 parts of chemical fertilizers, 10-150 parts of earthworm castings, 5-60 parts of humic acid, 50-650 parts of gypsum, and 0.01-0.3 parts of mixed bacterial agents. However, practical applications have shown that there are not many products that can really play an improvement role in large-scale practical applications. In addition, due to the differences in soil environments in different regions, the performance of the same alkaline soil conditioner in different regions and crop environments may vary greatly. At present, there are few soil conditioners on the market for alkaline soil and beet cultivation.

[0004] Therefore, there is an urgent need for a microbial agent and organic fertilizer composite alkaline soil improver and a preparation method thereof. Summary of the invention

[0005] The purpose of the present invention is to provide a microbial agent and organic fertilizer composite alkaline soil improver and a preparation method thereof.

[0006] In order to achieve the above object, the present invention provides the following technical solutions: A microbial agent and organic fertilizer composite alkaline soil improver, comprising the following components in parts by weight: 30-35 parts of organic fertilizer, 5-10 parts of modified attapulgite, 13-18 parts of humic acid, 20-25 parts of medicinal residue compost, 3-6 parts of microbial agent and 2-5 parts of water retaining agent; Furthermore, the preparation method of medicinal residue compost comprises the following steps: (1) Mixing dried dregs of Herba Lycopodiellae, Herba Smilax and Herba Codonopsis pilosulae to obtain traditional Chinese medicine dregs; (2) spraying water into the Chinese medicine residue to control the moisture content of the Chinese medicine residue to 50wt%-60wt%, adding composite bacteria, mixing evenly, and obtaining a fermentation material; (3) The fermented material is composted indoors at a room temperature of 10-15°C, a compost pile height of 90-100 cm, and a fertilizer amount of 3-5 cubic meters. When the temperature reaches 60°C, the compost is turned mechanically. The compost is fermented for 8-10 days. After fermentation is complete, it is dried and crushed to obtain medicinal residue compost.

[0007] Furthermore, the weight ratio of the residues of Herba Lycopodii, Herba Smilax and Herba Codonopsis pilosulae is 1:(1.3-1.5):(0.6-0.8).

[0008] Furthermore, the weight ratio of the dry weight of the Chinese medicinal residue to the composite bacteria is 1000:(2-3).

[0009] Furthermore, the composite bacteria include Lactobacillus crispatus, Lactobacillus rhamnosus and Lactobacillus acidophilus.

[0010] Furthermore, the content of Lactobacillus crispatus in the composite bacteria was 6.0×10 6 -8.0×10 6 cfu / g; the content of Lactobacillus rhamnosus was 2.0×10 7 -5.0×10 7 cfu / g; the content of Lactobacillus acidophilus was 5.0×10 7 -8.0×10 7 cfu / g.

[0011] Traditional Chinese medicine residues contain a large amount of organic matter. If they are directly discharged into the environment, they will cause water pollution, soil pollution and other problems. The rational reuse of traditional Chinese medicine residues can effectively reduce environmental pollution. The residues produced by the manufacture of Sanjin Tablets: the residues of sheep open mouth, the residues of smilax china, and the residues of ginseng are mixed and fermented with a specific strain of bacteria. The obtained residue compost can improve the emergence rate and growth condition of sugar beets. Because the residue compost of the present invention contains rich organic matter, it can be converted into a form that is easy for sugar beets to absorb after fermentation, providing sufficient nutrients. The use of specific strains for fermentation can introduce beneficial microorganisms, improve soil structure, increase soil fertility, and promote the growth of sugar beet roots.

[0012] Furthermore, the microbial agent includes Bacillus subtilis, Lactobacillus casei and Bacillus amyloliquefaciens.

[0013] Furthermore, the content of Bacillus subtilis in the microbial agent is 1.0×10 8 -3.0×10 8 cfu / g; the content of Lactobacillus casei was 5.0×10 8 -7.0×10 8 cfu / g; the content of Bacillus amyloliquefaciens was 1.0×10 7 -3.0×10 7 cfu / g.

[0014] The present invention can play a synergistic role with the compost of medicinal residues by adding a microbial agent composed of specific strains, thereby improving the physical and chemical properties of the soil, reducing the pH of the soil, and increasing the content of organic matter, effective phosphorus, and quick-acting potassium in the soil. The specific strains in the microbial agent of the present invention have a synergistic effect, and the products in the metabolic process can neutralize the alkaline substances in the soil, reduce the pH value of the soil, and make it more suitable for the growth of crops such as beets, and can further decompose the complex organic matter in the medicinal residues to release more nutrients.

[0015] Moreover, when specific amounts of Lactobacillus crispatus, Lactobacillus rhamnosus and Lactobacillus acidophilus are used in the composite bacteria, and specific amounts of Bacillus subtilis, Lactobacillus casei and Bacillus amyloliquefaciens are included in the microbial agent, the single plant weight and sugar content of beet tubers can be improved.

[0016] Furthermore, the preparation method of modified attapulgite comprises the following steps: (1) adding 1 part by weight of attapulgite to 10-15 parts by weight of 15-20 wt% hydrochloric acid, soaking for 1-2 hours, standing, clarifying, centrifuging, washing with water until neutral, and drying to obtain pretreated attapulgite; (2) mixing 1 part by weight of 3-isocyanatepropyltrimethoxysilane and 5-8 parts by weight of pretreated attapulgite, ultrasonicating for 20-25 minutes, adding 40-50 parts by weight of N,N-dimethylformamide, stirring at 100-105° C. for 2-3 hours, centrifuging, and drying to obtain silane-modified attapulgite; (3) 10 parts by weight of silane-modified attapulgite and 60-65 parts by weight of ethanol are mixed, and then a mixture of titanium dioxide and water in a weight ratio of 1: (4-6) is added dropwise, stirred at 55-60° C. for 2-3 hours, centrifuged, and dried to obtain modified attapulgite.

[0017] Furthermore, the weight ratio of silane-modified attapulgite to titanium dioxide is 10:(1-3).

[0018] The present invention attempts to increase the yield of sugar beets by adding attapulgite, but the effect is not ideal. The present invention can improve the yield of sugar beets by modifying attapulgite. It is analyzed that acid washing can remove impurities and some metal ions on the surface of attapulgite, attapulgite makes soil particles looser, increases the porosity of the soil, and 3-isocyanate propyl trimethoxy silane first reacts with the carboxyl group on the surface of attapulgite, and then grafts titanium dioxide, which has a high specific surface area and adsorption capacity. After grafting, the porosity of the soil can be further increased, the air permeability and water permeability of the soil can be improved, and the yield of sugar beets can be increased.

[0019] Furthermore, the method for preparing organic fertilizer includes the following steps: crushing corn stalks, then adding earthworm castings accounting for 16-20% of the weight of the crushed corn stalks to obtain a mixture, adding water to make the moisture content of the mixture 40-45wt%, and obtaining organic fertilizer.

[0020] Furthermore, the water retaining agent is polyacrylamide.

[0021] Furthermore, the molecular weight of the polyacrylamide is 12 million and it is purchased from Gongyi Shibata Yuzhou Chemical Plant.

[0022] The present invention also provides a method for preparing the microbial agent and organic fertilizer composite alkaline earth improver, comprising the following steps: uniformly mixing organic fertilizer, modified attapulgite, humic acid, medicinal residue compost, microbial agent and water retaining agent to obtain the microbial agent and organic fertilizer composite alkaline earth improver.

[0023] Compared with the prior art, the advantages and beneficial effects of the present invention are: 1. The present invention mixes the residues produced by manufacturing Sanjin Tablets: the residues of Sheep Open Mouth, the residues of Smilax china and the residues of Rhizoma Coptidis, and ferments them using specific strains to obtain the residue compost, which can improve the emergence rate and growth condition of sugar beets.

[0024] 2. The present invention, by adding microbial agents composed of specific bacterial species, can play a synergistic role with the medicinal residue compost, provide improvements in the physical and chemical properties of the soil, reduce the pH of the soil, and increase the content of organic matter and available phosphorus and quick-acting potassium in the soil.

[0025] 3. When specific amounts of Lactobacillus crispatus, Lactobacillus rhamnosus and Lactobacillus acidophilus are used in the composite bacteria, and specific amounts of Bacillus subtilis, Lactobacillus casei and Bacillus amyloliquefaciens are included in the microbial agent, the weight of individual beet roots and the sugar content of the roots can be improved.

[0026] 4. The present invention can improve the yield of sugar beets by modifying attapulgite. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] The raw materials used in the following examples of the present invention are all commercially available products: Bifidobacterium animalis, number: SHBCCD24407AS1.1852, was purchased from China Center for Type Culture Collection.

[0029] Lactobacillus crispatus, number: CICC24879, was purchased from China Industrial Microbiological Culture Collection Center.

[0030] Lactobacillus rhamnosus, number: SHBCCD73158, was purchased from Shanghai Collection of Microorganisms Center.

[0031] Lactobacillus acidophilus, number: CICC22162, was purchased from China Industrial Microbiological Culture Collection Center.

[0032] Streptococcus thermophilus, number: CCTCCAB2010206, was purchased from China Center for Type Culture Collection.

[0033] Lactobacillus bulgaricus, number: CCTCCCB20082295, was purchased from China Center for Type Culture Collection.

[0034] Bacillus subtilis, number: SHBCCD52898, was purchased from Shanghai Microbiological Collection Center.

[0035] Lactobacillus casei, number: SHBCCD73160, was purchased from Shanghai Collection of Microorganisms Center.

[0036] Bacillus amyloliquefaciens, number: SHBCCD71089, was purchased from Shanghai Microbiological Collection Center.

[0037] The traditional Chinese medicine residue is the pharmaceutical waste residue of Sanjin Tablets, and its preparation method is as shown in Example 1 of CN202011531751.8.

[0038] Attapulgite, Lingshou County Haibin Mineral Products Trading Co., Ltd., 200 mesh.

[0039] Titanium dioxide, Wuhan Xindongyi Chemical Co., Ltd., model HTR628.

[0040] The water retaining agent is polyacrylamide, the molecular weight of which is 12 million, and is purchased from Gongyi Shibata Yuzhou Chemical Plant.

[0041] Humic acid, Shanxi Jiayou Humic Acid Technology Co., Ltd.

[0042] Example 1: This example provides a microbial agent and organic fertilizer composite alkaline soil improver, comprising the following components in parts by weight: 32 parts of organic fertilizer, 8 parts of modified attapulgite, 15 parts of humic acid, 22 parts of medicinal residue compost, 5 parts of microbial agent and 3 parts of water retaining agent; The preparation method of medicinal residue compost comprises the following steps: (1) Mixing dried dregs of Herba Lycopodiellae, Herba Smilax and Herba Codonopsis pilosulae in a weight ratio of 1:1.4:0.7 to obtain traditional Chinese medicine dregs; (2) Spraying water into the Chinese medicine residue to control the moisture content of the Chinese medicine residue to 55wt%, adding composite bacteria, the weight ratio of the Chinese medicine residue dry weight to the composite bacteria is 1000:2.5, mixing evenly, and obtaining a fermentation material; the composite bacteria includes Lactobacillus crispatus, Lactobacillus rhamnosus and Lactobacillus acidophilus; the content of Lactobacillus crispatus in the composite bacteria is 7.0×10 6 cfu / g; the content of Lactobacillus rhamnosus was 3.0×10 7 cfu / g; the content of Lactobacillus acidophilus was 6.0×10 7 cfu / g.

[0043] (3) The fermented material is composted indoors at a room temperature of 12°C, a compost pile height of 95 cm, and a fertilizer amount of 4 cubic meters. When the temperature reaches 60°C, the compost is turned mechanically. The compost is fermented for 9 days. After fermentation is complete, it is dried and crushed to obtain medicinal residue compost.

[0044] The microbial agent includes Bacillus subtilis, Lactobacillus casei and Bacillus amyloliquefaciens. The content of Bacillus subtilis in the microbial agent is 2.0×10 8 cfu / g; the content of Lactobacillus casei was 6.0×10 8 cfu / g; the content of Bacillus amyloliquefaciens was 2.0×10 7 cfu / g.

[0045] The preparation method of modified attapulgite comprises the following steps: (1) adding 1 part by weight of attapulgite to 12 parts by weight of 17 wt% hydrochloric acid, soaking for 1.5 hours, standing, clarifying, centrifuging, washing with water until neutral, and drying to obtain pretreated attapulgite; (2) 1 part by weight of 3-isocyanatepropyltrimethoxysilane and 6 parts by weight of pretreated attapulgite were mixed, ultrasonicated for 22 minutes, 45 parts by weight of N,N-dimethylformamide were added, stirred at 102° C. for 2.5 hours, centrifuged, and dried to obtain silane-modified attapulgite; (3) 10 parts by weight of silane-modified attapulgite and 62 parts by weight of ethanol were mixed, and then a mixture of titanium dioxide and water in a weight ratio of 1:5 was added dropwise, and the weight ratio of silane-modified attapulgite to titanium dioxide was 5:1; the mixture was stirred at 57°C for 2.5 hours, centrifuged, and dried to obtain modified attapulgite.

[0046] The method for preparing organic fertilizer comprises the following steps: crushing corn stalks, adding earthworm feces accounting for 18% of the weight of the crushed corn stalks to obtain a mixture, adding water to make the water content of the mixture 42wt%, and obtaining organic fertilizer.

[0047] The preparation method of the microbial agent and organic fertilizer composite alkaline soil improver comprises the following steps: organic fertilizer, modified attapulgite, humic acid, medicinal residue compost, microbial agent and water retaining agent are uniformly mixed to obtain the microbial agent and organic fertilizer composite alkaline soil improver.

[0048] Example 2: This example provides a microbial agent and organic fertilizer composite alkaline soil improver, comprising the following components in parts by weight: 30 parts of organic fertilizer, 10 parts of modified attapulgite, 13 parts of humic acid, 25 parts of medicinal residue compost, 3 parts of microbial agent and 5 parts of water retaining agent; The preparation method of medicinal residue compost comprises the following steps: (1) Mixing dried dregs of Herba Lycopodiellae, Herba Smilax Chinensis and Herba Codonopsis Rubrae in a weight ratio of 1:1.3:0.8 to obtain traditional Chinese medicine dregs; (2) spraying water into the Chinese medicine residue to control the moisture content of the Chinese medicine residue to 60wt%, adding composite bacteria, the weight ratio of the Chinese medicine residue dry weight to the composite bacteria is 1000:3, mixing evenly, and obtaining a fermentation material; the composite bacteria includes Lactobacillus crispatus, Lactobacillus rhamnosus and Lactobacillus acidophilus; the content of Lactobacillus crispatus in the composite bacteria is 8.0×10 6 cfu / g; the content of Lactobacillus rhamnosus was 2.0×10 7 cfu / g; the content of Lactobacillus acidophilus was 8.0×10 7 cfu / g.

[0049] (3) The fermented material is composted indoors at a room temperature of 15°C, a compost pile height of 90 cm, and a fertilizer amount of 5 cubic meters. When the temperature reaches 60°C, the compost is turned mechanically. The compost is fermented for 10 days. After fermentation is complete, it is dried and crushed to obtain medicinal residue compost.

[0050] The microbial agent includes Bacillus subtilis, Lactobacillus casei and Bacillus amyloliquefaciens. The content of Bacillus subtilis in the microbial agent is 3.0×10 8 cfu / g; the content of Lactobacillus casei was 5.0×10 8 cfu / g; the content of Bacillus amyloliquefaciens was 3.0×10 7 cfu / g.

[0051] The preparation method of modified attapulgite comprises the following steps: (1) adding 1 part by weight of attapulgite to 10 parts by weight of 20 wt% hydrochloric acid, soaking for 1 hour, standing, clarifying, centrifuging, washing with water until neutral, and drying to obtain pretreated attapulgite; (2) 1 part by weight of 3-isocyanatepropyltrimethoxysilane and 8 parts by weight of pretreated attapulgite were mixed, ultrasonicated for 20 minutes, 50 parts by weight of N,N-dimethylformamide were added, stirred at 100° C. for 3 hours, centrifuged, and dried to obtain silane-modified attapulgite; (3) Mix 10 parts by weight of silane-modified attapulgite and 65 parts by weight of ethanol, and then add a mixture of titanium dioxide and water in a weight ratio of 1:6, and the weight ratio of silane-modified attapulgite to titanium dioxide is 10:3; stir at 55°C for 3 hours, centrifuge, and dry to obtain modified attapulgite.

[0052] The method for preparing organic fertilizer comprises the following steps: crushing corn stalks, adding earthworm feces accounting for 20% of the weight of the crushed corn stalks to obtain a mixture, adding water to make the water content of the mixture 40wt%, and obtaining organic fertilizer.

[0053] The preparation method of the microbial agent and organic fertilizer composite alkaline soil improver comprises the following steps: organic fertilizer, modified attapulgite, humic acid, medicinal residue compost, microbial agent and water retaining agent are uniformly mixed to obtain the microbial agent and organic fertilizer composite alkaline soil improver.

[0054] Comparative Example 1 The difference between this comparative example and Example 1 is: a microbial agent and organic fertilizer composite alkaline soil improver, comprising the following components in parts by weight: 25 parts of organic fertilizer, 11 parts of modified attapulgite, 15 parts of humic acid, 29 parts of medicinal residue compost, 9 parts of microbial agent and 3 parts of water retaining agent.

[0055] Comparative Example 2 The difference between this comparative example and Example 1 is that the dried dregs of Herba Lycopodiellae, Herba Smilax Chinensis and Herba Codonopsis pilosulae are mixed in a weight ratio of 1:1:1 to obtain traditional Chinese medicine dregs.

[0056] Comparative Example 3 The difference between this comparative example and Example 1 is that the composite bacteria include animal Bifidobacterium, thermophilic Streptococcus and Bulgarian Lactobacillus; the content of animal Bifidobacterium in the composite bacteria is 7.0×10 6 cfu / g; the content of thermophilic Streptococcus was 3.0×10 7 cfu / g; the content of Lactobacillus bulgaricus was 6.0×10 7 cfu / g.

[0057] Comparative Example 4 The difference between this comparative example and Example 1 is that the content of Lactobacillus crispatus in the composite bacteria is 3.0×10 7 cfu / g; the content of Lactobacillus rhamnosus was 6.0×10 7 cfu / g; the content of Lactobacillus acidophilus was 7.0×10 6cfu / g.

[0058] Comparative Example 5 The difference between this comparative example and Example 1 is that the microbial agent includes Bacillus subtilis, Lactobacillus casei and Bacillus amyloliquefaciens. The content of Bacillus subtilis in the microbial agent is 6.0×10 8 cfu / g; the content of Lactobacillus casei was 2.0×10 7 cfu / g; the content of Bacillus amyloliquefaciens was 2.0×10 8 cfu / g.

[0059] Comparative Example 6 The difference between this comparative example and Example 1 is that the preparation method of modified attapulgite comprises the following steps: (1) adding 1 part by weight of attapulgite to 12 parts by weight of 17 wt% hydrochloric acid, soaking for 1.5 hours, standing, clarifying, centrifuging, washing with water until neutral, and drying to obtain pretreated attapulgite; (2) 1 part by weight of aniline methyl triethoxysilane and 6 parts by weight of pretreated attapulgite are mixed evenly and dried to obtain modified attapulgite.

[0060] Performance Testing Test plot: Field experiment for effect verification in alkaline land of Tianzhen County, Datong City, Shanxi Province.

[0061] Basic soil properties: soil pH 10.2, soil organic matter 8.17 g / kg, available phosphorus 7.6 mg / kg, and available potassium 121.5 mg / kg.

[0062] The test treatments were as follows: experimental group: alkaline soil conditioners of Examples 1-2 and Comparative Examples 1-6; control group: no fertilizer was used. Area of ​​each group: 66.7 square meters, repeated 3 times.

[0063] Beet variety: KWS9419, bred by the German KWS Seed Company.

[0064] In early April, the land was leveled before sowing, plowed and harrowed, and then 100 kg of alkaline soil improver was applied and rotary tillage was used to mix the fertilizer and soil evenly. Sowing began on May 13, with spot sowing, row spacing of 45 cm, plant spacing of 40 cm, and mulch film covering. Harvest was on October 20.

[0065] The results are shown in Tables 1-3.

[0066]

[0067]

[0068]

[0069] From the above performance test results, it can be seen that the microbial agent and organic fertilizer composite alkaline soil improver prepared in Examples 1-2 can improve the physical and chemical properties of alkaline soil and increase the yield of sugar beets. In particular, the comprehensive performance of Example 1 is the most outstanding, which is mainly due to the synergistic effect between the components.

[0070] However, the comparative examples were significantly inferior to the embodiments in terms of the corresponding performance tests because they did not adopt the necessary technical solutions. In comparative example 1, the ratio of the modifier components was changed, and it can be seen that the improvement effect of the rational properties of the soil decreased, and the yield of beets decreased. In comparative example 2, the ratios of the three kinds of medicinal residues: the medicinal residues of sheep's mouth, the medicinal residues of smilax china, and the medicinal residues of golden sand vine were different. In comparative example 3, different strains were used, and it can be found that the emergence rate and growth status of beets decreased. In comparative example 4, the ratios of the strains of the composite bacteria were different, and it can be found that the weight of the individual plant of beet tubers and the sugar content of the tubers decreased; in comparative example 5, the strain ratios of the microbial agents were different, and the effect of improving the physical and chemical properties of the soil decreased, and the weight of the individual plant of beet tubers and the sugar content of the tubers decreased; in comparative example 6, the modification methods of attapulgite were different, and it can be found that the yield of beets decreased. The above experimental results further prove the importance of the technical solutions defined in the present invention for its technical effects.

[0071] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A microbial agent and organic fertilizer composite alkaline soil improver, characterized in that: The invention comprises the following components in parts by weight: 30-35 parts of organic fertilizer, 5-10 parts of modified attapulgite, 13-18 parts of humic acid, 20-25 parts of compost of medicinal residues, 3-6 parts of microbial agents and 2-5 parts of water retaining agent; The preparation method of medicinal residue compost comprises the following steps: (1) Mixing dried dregs of Herba Lycopodiellae, Herba Smilax and Herba Codonopsis pilosulae to obtain Chinese medicinal dregs; (2) spraying water into the Chinese medicine residue to control the moisture content of the Chinese medicine residue to 50wt%-60wt%, adding composite bacteria, mixing evenly, and obtaining a fermentation material; (3) The fermented material is composted indoors at a room temperature of 10-15°C, a compost pile height of 90-100 cm, and a fertilizer amount of 3-5 cubic meters. When the temperature reaches 60°C, the compost is turned mechanically. The compost is fermented for 8-10 days. After fermentation is complete, it is dried and crushed to obtain medicinal residue compost.

2. The microbial agent and organic fertilizer composite alkaline soil improver according to claim 1, characterized in that: The weight ratio of the residues of Herba Lycopodii, Herba Smilax and Herba Codonopsis pilosulae is 1:(1.3-1.5):(0.6-0.8).

3. The microbial agent and organic fertilizer composite alkaline soil improver according to claim 1, characterized in that: The weight ratio of the dry weight of the Chinese medicinal residue to the composite bacteria is 1000:(2-3).

4. The microbial agent and organic fertilizer composite alkaline soil improver according to claim 1, characterized in that: The complex bacteria include Lactobacillus crispatus, Lactobacillus rhamnosus and Lactobacillus acidophilus.

5. The microbial agent and organic fertilizer composite alkaline soil improver according to claim 4, characterized in that: The content of Lactobacillus crispatus in the composite bacteria was 6.0×10 6 -8.0×10 6 cfu / g; the content of Lactobacillus rhamnosus was 2.0×10 7 -5.0×10 7 cfu / g; the content of Lactobacillus acidophilus was 5.0×10 7 -8.0×10 7 cfu / g.

6. The microbial agent and organic fertilizer composite alkaline soil improver according to claim 1, characterized in that: The microbial agent includes Bacillus subtilis, Lactobacillus casei and Bacillus amyloliquefaciens; the content of Bacillus subtilis in the microbial agent is 1.0×10 8 -3.0×10 8 cfu / g; the content of Lactobacillus casei was 5.0×10 8 -7.0×10 8 cfu / g; the content of Bacillus amyloliquefaciens was 1.0×10 7 -3.0×10 7 cfu / g.

7. The microbial agent and organic fertilizer composite alkaline soil improver according to claim 1, characterized in that: The preparation method of modified attapulgite comprises the following steps: (1) adding 1 part by weight of attapulgite to 10-15 parts by weight of 15-20 wt% hydrochloric acid, soaking for 1-2 hours, standing, clarifying, centrifuging, washing with water until neutral, and drying to obtain pretreated attapulgite; (2) mixing 1 part by weight of 3-isocyanatepropyltrimethoxysilane and 5-8 parts by weight of pretreated attapulgite, ultrasonicating for 20-25 minutes, adding 40-50 parts by weight of N,N-dimethylformamide, stirring at 100-105° C. for 2-3 hours, centrifuging, and drying to obtain silane-modified attapulgite; (3) 10 parts by weight of silane-modified attapulgite and 60-65 parts by weight of ethanol are mixed, and then a mixture of titanium dioxide and water in a weight ratio of 1: (4-6) is added dropwise, stirred at 55-60° C. for 2-3 hours, centrifuged, and dried to obtain modified attapulgite.

8. The microbial agent and organic fertilizer composite alkaline soil improver according to claim 7, characterized in that: The weight ratio of silane-modified attapulgite to titanium dioxide is 10:(1-3).

9. The microbial agent and organic fertilizer composite alkaline soil improver according to claim 1, characterized in that: The method for preparing organic fertilizer comprises the following steps: crushing corn stalks, adding earthworm feces accounting for 16-20% of the weight of the crushed corn stalks to obtain a mixture, adding water to make the water content of the mixture 40-45wt%, and obtaining organic fertilizer.

10. A method for preparing the microbial agent and organic fertilizer composite alkaline soil improver according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: uniformly mixing organic fertilizer, modified attapulgite, humic acid, compost of medicinal residues, microbial agent and water retaining agent to obtain a composite alkaline soil improver of microbial agent and organic fertilizer.

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