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CN-121974762-A - Biological bacterial fertilizer capable of promoting growth and development of crop root systems

CN121974762ACN 121974762 ACN121974762 ACN 121974762ACN-121974762-A

Abstract

The application relates to the technical field of biological bacterial fertilizer, and discloses a biological bacterial fertilizer capable of promoting the growth and development of crop root systems. The preparation process adopts a liquid phase shielding and solid phase isolation strategy, wherein calcium lignosulfonate is used for wrapping chitosan oligosaccharide in a liquid phase to prevent flocculation, and sodium polyaspartate and superfine calcium silicate are premixed in a solid phase. During granulation, the acidic liquid phase excites the superfine calcium silicate to generate interface microetching to release calcium ions. By isolating the sodium polyaspartate in the solid phase matrix, the instant flocculation phenomenon caused by direct contact of the chitosan oligosaccharide with positive charges in the liquid phase and the sodium polyaspartate with negative charges in the solid phase can be avoided after the fertilizer is put into soil, the technical bottleneck that the mixed system of the anionic and cationic polymers is difficult to granulate is solved, the continuity of the granulating process is ensured, and the roundness of finished product particles is improved.

Inventors

  • Yin Benyou
  • Yue Lanju
  • JIA LIYU
  • WANG SHAOQING
  • ZHANG MINGZHU
  • ZHU JIAN

Assignees

  • 蚌埠格润生物科技有限公司

Dates

Publication Date
20260505
Application Date
20260206

Claims (10)

  1. 1. The biological bacterial fertilizer capable of promoting the growth and development of crop root systems is characterized by comprising the following components in parts by mass: 15.0-25.0 parts of brown sugar yeast activation solution, 0.5-1.2 parts of calcium lignosulfonate, 0.5-2.0 parts of chitosan oligosaccharide, 1.2-3.0 parts of sodium polyaspartate, 3.0-5.0 parts of superfine calcium silicate, 30.0-50.0 parts of decomposed organic fertilizer, 3.0-8.0 parts of bacillus mucilaginosus bacterial powder and 27-45 parts of auxiliary components.
  2. 2. The biological bacterial fertilizer according to claim 1, wherein the auxiliary components specifically comprise 10.0-15.0 parts of EM bacterial liquid, 8.0-10.0 parts of bacillus subtilis bacterial powder, 2.0-5.0 parts of saccharomyces cerevisiae bacterial powder, 5.0-10.0 parts of trichoderma harzianum agent and 2.0-5.0 parts of biochemical potassium fulvate.
  3. 3. The biological bacterial fertilizer according to claim 1, wherein the chitosan oligosaccharide has a deacetylation degree of not less than 95.0%, a weight average molecular weight of 1000 Da-3000 Da, the sodium polyaspartate has a weight average molecular weight of 5000 Da-8000 Da, the molecular chain contains alpha-type and beta-type amide bonds, and the superfine calcium silicate has a particle size distribution D90 of not more than 10 mu m and a specific surface area of not less than 1250 mesh.
  4. 4. The biological bacterial fertilizer according to claim 1, wherein the preparation method of the brown sugar yeast activation liquid is characterized in that brown sugar is weighed and dissolved in deionized water with the temperature of 35-38 ℃, active dry yeast is added, and the mixture is subjected to standing, activating and fermenting for 12-24 hours under the airtight condition of 30-35 ℃ until the pH value is reduced to 4.5-5.0 and the mixture is accompanied with acid flavor.
  5. 5. The biological bacterial fertilizer according to claim 1, wherein the grain size distribution D90 of the superfine calcium silicate is less than or equal to 6.5 μm, and the effective viable count of the bacillus mucilaginosus bacterial powder is more than or equal to 2.0X10- 9 CFU/g, and the biological bacterial fertilizer is used for continuously hydrolyzing the superfine calcium silicate after being applied into the soil so as to release silicon elements and calcium ions.
  6. 6. The biological bacterial fertilizer according to claim 1, wherein the preparation method of the biological bacterial fertilizer comprises the following steps: S1, preparing deflocculating liquid phase colloid dispersion liquid, namely taking brown sugar yeast activating liquid, regulating the pH value to be acidic, adding calcium lignosulfonate, stirring and dissolving, then adding chitosan oligosaccharide powder under the condition of high shear, and stirring uniformly to obtain dispersion liquid; s2, preparing a mineral activated solid matrix, namely spraying and mixing EM bacterial liquid into the decomposed organic fertilizer to obtain a carrier with bacteria, premixing sodium polyaspartate powder with superfine calcium silicate, adding the decomposed organic fertilizer, bacillus mucilaginosus bacterial powder and the rest auxiliary components, and uniformly mixing to obtain solid powder; S3, solid-liquid coupling granulation and interface microetching, namely sending the solid powder obtained in the step S2 into a granulator, atomizing and spraying the dispersion liquid obtained in the step S1 onto the surface of the solid powder for granulation, and drying to obtain the biological bacterial fertilizer.
  7. 7. The biological bacterial fertilizer according to claim 6, wherein in the step S1, the pH value is regulated to be acidic, specifically, the pH value is regulated to be 5.0-5.5 by using citric acid, the rotating speed of the high shearing condition is 3000-5000 rpm, the shearing time is 5-10 min, and the dispersing temperature is controlled to be 28+/-2 ℃.
  8. 8. The biological bacterial fertilizer according to claim 6, wherein in the step S2, the premixing time of the sodium polyaspartate powder and the superfine calcium silicate is 10-15 min, and in the step S3, the water content in the granulating process is controlled to be 25% -30%.
  9. 9. The biological bacterial fertilizer according to claim 6, wherein the drying temperature in S3 is controlled to be 45-50 ℃ and the final water content is less than or equal to 15%.
  10. 10. The biological bacterial fertilizer according to claim 6, wherein in the step S3, the spraying pressure of the atomization spraying is 0.3MPa plus or minus 0.05MPa, and the dried particles are screened to obtain a finished product with the particle size of 2.0-4.0 mm.

Description

Biological bacterial fertilizer capable of promoting growth and development of crop root systems Technical Field The invention relates to the technical field of biological bacterial fertilizers, in particular to a biological bacterial fertilizer capable of promoting the growth and development of crop root systems. Background Biological bacterial fertilizer can improve the micro-ecological environment of soil and promote the growth of crops through the life activities of beneficial microorganisms, and is an important means for reducing the dependency of chemical fertilizers in modern agriculture. Efficient colonization of beneficial microorganisms at the root of crops is a prerequisite for their growth promoting function. However, after the conventional biological bacterial fertilizer is applied to soil, the bacterial strain is usually in a discrete suspension state, and is very easy to migrate and run away along with rainwater or irrigation water due to the lack of an effective attached carrier, so that stable dominant bacterial colony is difficult to form on the surface of a root system, and the utilization rate of the fertilizer is reduced. In order to increase the colonization efficiency of microorganisms, the prior art has attempted to introduce functional polymeric materials, such as chitosan oligosaccharides and polyaspartic acid, with film-forming or adhesive properties into fertilizer formulations. The chitosan oligosaccharide has positive charges, the polyaspartic acid has negative charges, and the chitosan oligosaccharide and the polyaspartic acid can be crosslinked into a film in a rhizosphere environment through electrostatic interaction theoretically, so that microorganisms are fixed around a root system. However, in practical industrial production, such anionic and cationic polymer systems face serious process challenges. Because the charges of the two materials are opposite, severe electrostatic adsorption can occur in the process of mixing and preparing liquid phase or granulating, so that slurry is instantly flocculated or agglomerated, slurry spraying equipment is easily blocked or particle forming failure is caused, and continuous production is difficult to realize. In addition, even if prepared into granules by physical isolation means, the fertilizer also faces the problem of film forming reaction kinetics after being applied to soil. The existing technical proposal generally relies on metal ions originally existing in soil to participate in crosslinking, and the film forming reaction is slow in starting speed due to complex soil environment and uncontrollable ion concentration, so microorganisms are often lost before a film structure is formed. Meanwhile, the stability of the polymer film structure depends on the continuous existence of crosslinking agents such as calcium ions, and the conventionally added water-soluble calcium salt is too fast to dissolve, is easy to run off in the early application stage, causes the later-stage film structure to disintegrate, and cannot provide long-acting biological barriers and nutritional support for crop root systems. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a biological bacterial fertilizer capable of promoting the growth and development of crop root systems, and solves the problems that pelleting is difficult due to flocculation when anionic and cationic polymer components are mixed, and microbial colonization efficiency is low due to film forming reaction delay and lack of long-acting calcium source maintenance after the fertilizer is applied to soil. In order to achieve the aim, in the first aspect, the invention provides a biological bacterial fertilizer capable of promoting the growth and development of crop root systems, which comprises, by mass, 15.0-25.0 parts of brown sugar yeast activation liquid, 0.5-1.2 parts of calcium lignosulfonate, 0.5-2.0 parts of chitosan oligosaccharide, 1.2-3.0 parts of sodium polyaspartate, 3.0-5.0 parts of superfine calcium silicate, 30.0-50.0 parts of decomposed organic fertilizer, 3.0-8.0 parts of bacillus mucilaginosus bacterial powder and 27-45 parts of auxiliary components. By adopting the technical scheme, the invention utilizes the brown sugar yeast activation solution to provide an acidic environment and is matched with the dispersion property of calcium lignosulfonate, so that the chitosan oligosaccharide with positive electricity and the sodium polyaspartate with negative electricity can stably coexist in fertilizer particles. The chitosan oligosaccharide and the sodium polyaspartate are used as film forming matrix, the superfine calcium silicate is used as a reaction type calcium source and a pH buffering agent, and the bacillus mucilaginosus is used as a mineral decomposing agent. After the fertilizer is applied into soil and dissolved in water, the components can generate a polymer network structure with water retention and adhesion performance on t