Are you really clear about the 8 effects of Bacillus subtilis?

Ninety percent of the bacterial fertilizer currently on the market adds this Bacillus subtilis! Because it has the following eight effects.

1. Antibiotic effect

Antibiotic action means that the antimony can inhibit the growth and metabolism of pathogenic microorganisms by producing metabolites at low concentrations, thereby affecting the survival and activity of pathogenic microorganisms. In the past half century, many effective antibacterial substances have been isolated and purified from the metabolites of different strains of Bacillus subtilis.

2, bacteriolysis

The bacteriolysis of Bacillus subtilis is mainly manifested by adsorption on the hyphae of pathogenic bacteria and growth with mycelial growth, followed by lytic substances causing leakage of protoplasts to cause mycelium to rupture; or production of antibacterial substances by dissolving pathogen spores The cell wall or cell membrane causes pores and deformities of the cell wall to inhibit spore germination.

3. Inducing plant resistance and promoting plant growth

Among them, Bacillus subtilis has the strongest resistance, the most functions, the widest adaptability and the most stable effect. Bacillus subtilis is capable of producing cytokinins and phytohormone-like substances that promote plant growth and protect plants against pathogens.

4, protect the environment

Bacillus subtilis is widely used in biological fertilizers. When used as a crop or soil, it can colonize the crop rhizosphere or in vivo and has a specific fertilizer effect. At present, microbial fertilizers are fertilizing soil, improving the utilization rate of chemical fertilizers, inhibiting the absorption of nitrate nitrogen, heavy metals and pesticides by crops, purifying and repairing soils, reducing the occurrence of crop diseases, and promoting the utilization of crop straw and municipal waste. It has played an irreplaceable role in improving the quality of crop products and food safety.

5. Adsorption and biodegradation of phenanthrene and benzopyrene in soil by Bacillus subtilis

The water environment connected to the soil is called the soil-water environment system, in which there are a large number of soil-inherent microorganisms, and there is a biofilm on the surface, because the biofilm forms a barrier layer, and the organic pollutants are in contact with the solid substrate supporting the biofilm. Previously, it must first be reached and passed through this barrier, which strongly changes the adsorption behavior of the mineral particles or substrate, which has an important effect on the adsorption.

Studies have shown that Bacillus subtilis can be used to inoculate microorganisms, and both phenanthrene and benzopyrene can be adsorbed or biodegraded. When the concentration of PAHs in liquid phase reaches equilibrium, the microorganisms eliminate 98% of phenanthrene and 85% of benzopyrene. The 48h adsorption isotherms of the inoculated samples were linear, which accorded well with the linear equation.

6. Effect of Bacillus subtilis on the respiration rate of soil microorganisms

As one of the indicators of soil biological activity, soil respiration intensity can reflect the conversion and supply capacity of soil nutrients to a certain extent. The change of respiration rate and the direction of change also reflect the sensitivity and response mode of ecosystem to stress, which is environmental safety. An important indicator of the evaluation, when the soil is contaminated by foreign pollutants, the microorganisms may need more energy to survive, and the metabolic activity of the soil microorganisms will respond to different degrees.

7. Effect of Bacillus subtilis on soil urease activity

The application of soil enzymes as monitoring indicators to evaluate the ecotoxicological effects of pesticides has become one of the research hotspots in the field of environmental science. Urease is a hydrolyzed enzyme that has been studied in the soil and is the only enzyme that has a significant effect on the conversion of urea in soil and urea utilization.

After urea is applied to the soil, it is rapidly decomposed into carbon dioxide and ammonia under the catalytic action of urease. Therefore, the reduction of soil urease activity can not only slow down the hydrolysis of urea, but also make the hydrolysate more adsorbed by the soil and effectively reduce the urea hydrolysate. The loss of ammonia volatilization may also reduce the nitrification potential of the hydrolysate.

8. Improvement of saline-alkali land by Bacillus subtilis

The accumulation of salt in the soil is viscous in soil structure, poor air permeability, high bulk density, rising soil temperature, poor aerobic microbial activity, slow release of nutrients, low permeability coefficient and strong capillary action, which further aggravates surface soil salinization. The soil is cold, hard and plated. Generally speaking, when the water-soluble salts in the soil surface layer or sub-surface layer accumulate more than 0.1%, or the alkalization degree of the soil alkalization layer exceeds 5%, it belongs to saline soil.

More pesticide knowledge , please pay attention to China Pesticide Network

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