What is the function of biological fertilizer (bacterial fertilizer)?

Answer: (1) Improve soil fertility. This is the main function of bio-fertilizers, such as various autogenous, combined or * * * biological nitrogen-fixing fertilizers, which can fix nitrogen in the air and increase the nitrogen content in the soil; A variety of microorganisms that decompose phosphorus and potassium minerals, such as silicate bacteria, can decompose potassium feldspar, mica and phosphorus ore in soil to make insoluble phosphorus and potassium effective.

(2) Manufacturing and assisting crops to absorb nutrients. After the application of some bacterial fertilizers, such as "5406" antibiotic bacterial fertilizer, due to the activities of microorganisms, it can not only increase the effective nutrients in the soil, but also produce a variety of hormones and vitamins, thus promoting the growth of crops; The nitrogen provided by rhizobia to leguminous plants in rhizobia fertilizer accounts for 30% ~ 80% of their lifetime needs; VA mycorrhiza is a kind of soil fungus, which can grow with the roots of many plants. Its hyphae extend far from the roots and can absorb more nutrients for various plants, especially phosphorus.

(3) Enhance the stress resistance of plants. After inoculation, some strains of bio-fertilizer grow and reproduce in the roots of crops and become the dominant bacteria in the rhizosphere of crops. They can secrete antibiotics against fungi and bacteria, thus inhibiting the growth of various germs. The hyphae of VA mycorrhiza can not only absorb nutrients beneficial to crop growth, but also increase crop water absorption and improve crop drought resistance.