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CN-122010634-A - Microbial fertilizer for promoting plant growth in saline-alkali soil and preparation method thereof

CN122010634ACN 122010634 ACN122010634 ACN 122010634ACN-122010634-A

Abstract

The application relates to the technical field of agricultural soil improvement, and particularly discloses a microbial fertilizer for promoting plant growth in saline-alkali soil and a preparation method thereof. The microbial fertilizer comprises a composite microbial agent, a decomposed organic fertilizer, organic acid, a sulfuric acid compound, urea, seaweed powder, fruit and vegetable residues, earthworm soil, polyglutamic acid and biochar, wherein the raw materials are synergistic to form a stable system. The preparation method comprises the steps of pre-activating the microbial inoculum and adsorbing the carrier, pre-treating the raw materials, mixing, drying by sectional temperature control, integrating tempering acid, granulating and performing carbon dioxide induction after-ripening to obtain the finished product. The microbial fertilizer can be used for improving the soil of the saline-alkali soil and promoting the plant growth, can relieve the saline-alkali stress, provides guarantee for microbial colonization, improves the physicochemical environment of the soil, promotes the soil fertility and has stable microbial activity. In addition, the preparation method disclosed by the application can protect the activity of the microbial inoculum in the whole process, avoid the inactivation of the microbial inoculum in the processing process, is convenient to operate and is convenient for industrial large-scale production.

Inventors

  • WANG TAO

Assignees

  • 湖北加倍威农业生物科技有限公司

Dates

Publication Date
20260512
Application Date
20260313

Claims (10)

  1. 1. The microbial fertilizer for promoting the plant growth of the saline-alkali soil is characterized by comprising, by weight, 8-13 parts of a compound microbial agent, 5.2-6.0 parts of a decomposed organic fertilizer, 2.2-3.2 parts of an organic acid, 1.2-3.2 parts of a sulfuric acid compound, 1-16 parts of urea, 4.2-5.2 parts of seaweed powder, 2.8-3.2 parts of fruit and vegetable residues, 2.8-3.2 parts of earthworm soil, 0.5-1.5 parts of polyglutamic acid and 2-4 parts of biochar.
  2. 2. The microbial fertilizer for promoting plant growth in saline-alkali soil according to claim 1, wherein the composite microbial agent consists of fermentation bacteria, salt-decomposing bacteria, probiotics, bacillus subtilis and aerobic denitrifying bacteria, and the mass ratio of the fermentation bacteria, the salt-decomposing bacteria, the probiotics, the bacillus subtilis and the aerobic denitrifying bacteria is (1-2): 2-3): 1-1.5): 1-2: 0.5-1.
  3. 3. The microbial fertilizer for promoting plant growth in saline-alkali soil according to claim 1, wherein the organic acid is one or more of linoleic acid, linolenic acid and oxalic acid, and the sulfuric acid compound is one or both of ferrous sulfate and zinc sulfate.
  4. 4. The microbial fertilizer for promoting plant growth in saline-alkali soil according to claim 1, wherein the decomposed organic fertilizer is prepared by high-temperature decomposition of livestock manure, straw and soybean meal, and the mass ratio of the livestock manure, the straw to the soybean meal is (3-5): 2-3): 1-2.
  5. 5. A method for preparing a microbial fertilizer for promoting plant growth in saline-alkali soil, characterized in that the microbial fertilizer for promoting plant growth in saline-alkali soil according to any one of claims 1 to 4 comprises the following steps: S1, microbial agent pre-activation and carrier adsorption, namely mixing a composite microbial agent, part of seaweed powder and polyglutamic acid, adding a nutrient solution for activation treatment, and then mixing and adsorbing with biochar to obtain a biochar carrier loaded with the microbial agent; S2, raw material pretreatment and mixing, namely respectively crushing decomposed organic fertilizer, sulfuric acid compound, urea, residual seaweed powder, fruit and vegetable residues and earthworm soil, and then mixing and stirring with a biochar carrier loaded with a microbial inoculum and deionized water to obtain a primary mixture; s3, sectional temperature control drying and activation, namely sequentially carrying out sectional drying treatment on the initial mixture at relatively low temperature and relatively high temperature to obtain an activated dry mixture; S4, tempering and acid integration, namely adding deionized water and organic acid into the activated dry mixture, uniformly mixing, and maintaining for a period of time at a preset temperature for an integration reaction to obtain a tempered wet mixture; And S5, granulating and inducing after-ripening, namely granulating the conditioned wet mixture, placing the obtained granules in a preset temperature and humidity environment for after-ripening treatment, introducing air containing low-concentration carbon dioxide at the initial stage of the after-ripening treatment, and then finishing the whole after-ripening process to obtain the microbial fertilizer.
  6. 6. The preparation method of the microbial fertilizer for promoting plant growth in saline-alkali soil according to claim 5, wherein in the step S1, the activating treatment is carried out at a temperature of 30-35 ℃ for 1-2 hours, and the nutrient solution is an aqueous solution containing yeast extract powder and potassium dihydrogen phosphate, and the addition amount of the nutrient solution is 20-40% of the total mass of the microbial inoculum and the seaweed powder.
  7. 7. The method for preparing microbial fertilizer for promoting plant growth in saline-alkali soil according to claim 5, wherein in the step S2, the particle size of the crushed material is 0.1-0.5mm, the stirring speed is 150-200r/min, and the stirring time is 50-65min.
  8. 8. The method for preparing microbial fertilizer for promoting plant growth in saline-alkali soil according to claim 5, wherein in the step S3, the relatively low temperature is 60-70 ℃, the treatment time is 2-3 hours, the relatively high temperature is 80-90 ℃, the treatment time is 1-2 hours, the tiling thickness of the primary mixture is 2-3cm, and the primary mixture is turned over in the treatment process.
  9. 9. The method for preparing microbial fertilizer for promoting plant growth in saline-alkali soil according to claim 5, wherein in the step S4, the preset temperature is 40-45 ℃, the maintaining time is 20-30 minutes, and the water content of the conditioned wet mixture obtained after conditioning is 25-30%.
  10. 10. The preparation method of the microbial fertilizer for promoting plant growth in saline-alkali soil according to claim 5, wherein in the step S5, the particle size of particles obtained by granulation is 2-4mm, the preset temperature and humidity environment is 25-30 ℃ and the humidity is 60-70%, the volume concentration of carbon dioxide in the introduced air is 0.5-1.5%, the ventilation duration is 24-48 hours, and the total time of the whole post-ripening process is 72-96 hours.

Description

Microbial fertilizer for promoting plant growth in saline-alkali soil and preparation method thereof Technical Field The application relates to the technical field of agricultural soil improvement, in particular to a microbial fertilizer for promoting plant growth in saline-alkali soil and a preparation method thereof. Background Saline-alkali soil is a low-yield soil type with wide distribution, and the physical and chemical properties of high salt and high alkali of the saline-alkali soil can damage the soil aggregate structure and inhibit the microbial activity of the soil, so that the absorption and utilization of nutrients of plants are affected. The microbial fertilizer has multiple functions of reducing salt, improving soil, fixing nitrogen and promoting growth, and becomes an important technical means for improving saline-alkali soil. At present, related products are mostly prepared by compounding organic fertilizers, inorganic salts and other raw materials with a compound microbial agent, and the functional bacteria are used for regulating the ion balance of soil, improving the soil fertility condition and providing assistance for the growth of saline-alkali soil crops. However, the existing microbial fertilizer for saline-alkali soil has a core problem that functional microorganisms are insufficient in stability under saline-alkali stress environments, and are difficult to colonize for a long time and continuously act. On one hand, the high osmotic pressure and the high pH value of the saline-alkali soil are easy to inhibit the metabolism and propagation of microorganisms, so that the activity of the saline-alkali soil is fast attenuated, on the other hand, the conventional fertilizer lacks a targeted microbial inoculum protection mechanism, and functional bacteria are easy to be inactivated by external factors in the processes of processing, storing and field application, so that the soil improvement and the promotion of the fertilizer can not be fully exerted, and the actual requirement of the saline-alkali soil improvement can not be met. Disclosure of Invention The application provides a microbial fertilizer for promoting plant growth in saline-alkali soil and a preparation method thereof, aiming at solving the problems that functional microorganisms in the prior art are insufficient in stability, difficult to colonize for a long time and continuously exert the effects of soil improvement and growth promotion in saline-alkali stress environments. In a first aspect, the application provides a microbial fertilizer for promoting plant growth in saline-alkali soil, which adopts the following technical scheme: The microbial fertilizer for promoting the plant growth in the saline-alkali soil comprises, by weight, 8-13 parts of a compound microbial agent, 5.2-6.0 parts of a decomposed organic fertilizer, 2.2-3.2 parts of an organic acid, 1.2-3.2 parts of a sulfuric acid compound, 1-16 parts of urea, 4.2-5.2 parts of seaweed powder, 2.8-3.2 parts of fruit and vegetable residues, 2.8-3.2 parts of earthworm soil, 0.5-1.5 parts of polyglutamic acid and 2-4 parts of biochar. By adopting the technical scheme, the composite microbial agent is taken as a core functional component, can play the basic roles of reducing salt, promoting growth, fixing nitrogen and improving soil, has good water retention and chelation characteristics, can lock soil moisture and chelate available nutrients in soil, reduces nutrient loss, has rich pore structures, can be taken as a carrier of microorganisms, adsorbs and fixes the microorganisms, and reduces the inactivation of the microorganisms in a saline-alkali environment. The decomposed organic fertilizer, seaweed powder, fruit and vegetable residues and earthworm soil are matched with each other to provide sufficient nutrition for the growth of microorganisms, the organic acid and sulfuric acid compound are used for synergistically regulating the physical and chemical environment of soil, relieving the saline-alkali stress, and various raw materials are mutually supplemented without antagonism, so that guarantee is provided for the colonization and efficacy exertion of microorganisms in saline-alkali soil. Preferably, the compound microbial agent consists of zymophyte, salt-decomposing bacteria, probiotics, bacillus subtilis and aerobic denitrifying bacteria, and the mass ratio of the zymophyte, the salt-decomposing bacteria, the probiotics, the bacillus subtilis and the aerobic denitrifying bacteria is (1-2): 2-3): 1-1.5): 1-2: 0.5-1. By adopting the technical scheme, salt in the soil can be decomposed by the salt decomposing bacteria, the salt content in the soil is reduced, the bacillus subtilis can secrete growth promoting substances to promote plant root system development, the aerobic denitrifying bacteria can convert redundant nitrogen in the soil, adverse effects of nitrogen accumulation in the soil are reduced, the fermentation bacteria can accelerate decomposition