The role of microbial fertilizers
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In terms of improving the supply of soil nutrients, microbial fertilizers promote the dissolution and release of poorly soluble nutrients in the soil mainly through the metabolic activities of the contained microbial agents. It is more representative of phosphate-dissolving bacteria and potassium-dissolving bacteria. Phosphate bacteria, on the one hand, decompose organic phosphides in soil by phospholipase; on the other hand, inorganic and organic acids produced by microbial metabolism dissolve inorganic phosphides. Potassium bacteria mainly produce acidic substances through the metabolism of potassium bacteria, which promotes the decomposition of potassium-containing minerals, thereby releasing potassium ions. At the same time, due to the release of a large amount of inorganic and organic acidic substances in the metabolic process of the microbial agents, the release and sequestration of trace elements such as silicon, aluminum, iron, magnesium and molybdenum in the soil are promoted, and the supply of nutrients in the soil is improved.
In promoting crop growth. The use of biological microbial agents can secrete gibberellin, auxin, vitamin B1, vitamin B2, vitamin B12 and other active substances. These growth stimulants have certain regulation and promotion effects on the growth and development of crops.
In enhancing the ability of crops to resist disease and stress. Some strains of microbial fertilizers have the function of secreting antibiotics, inhibiting or killing pathogenic fungi and bacteria. At the same time, a large number of field trials have also proved that the application of microbial fertilizer can reduce the incidence of pests and diseases and enhance the stress resistance of crops. For example, silicate fungicide has certain prevention and inhibition effects on corn leaf spot, cotton yellow wilt, wheat powdery mildew and stem rot. At the same time, it also has obvious effects of drought resistance, cold resistance and lodging resistance.
Huaxian Agricultural Technology Promotion Center Lu Shuguang