Biogas fertilizer is the residue and waste liquid after anaerobic fermentation such as crop straw and livestock manure, and it is an ideal fertilizer for pollution-free agricultural production. It is fermented and boiled in a closed fermentation tank. It has high water solubility, low nutrient loss, and few egg-borne pathogens. It is characterized by complete nutrient elements, high fertilizer efficiency, and excellent quality. Nitrogen, phosphorus, and potassium contents are higher than that of open pit and heap manure respectively. 60%, 50%, and 90% higher, the crop absorption rate is 20% higher than the open pit and stacking manure. Biogas fertilizer also contains a variety of trace elements and 17 kinds of amino acids, and the heavy metal content is low, so it is very suitable for the production of pollution-free agricultural products. Cultivated edible fungi can produce high-quality edible fungi with biogas residue and base material stack. Biogas residue is rich in available nutrients, fast mushrooming, uniform and fresh mushroom ball, good quality, high output value. The biogas residues are free of bacteria, and there are no bacteria after the mushroom bed. Mushroom cultivation with mushroom residue, yield can be increased by 30%. Fertilizer Fertility Biogas residue is a kind of high-quality sterile organic fertilizer with high nutrient content and good fertilizer effect. It can be used as base fertilizer or top dressing, and the application method is the same as that of common farmhouse fertilizer. The quality of grain, fruits and vegetables grown with biogas residue fertilizer is moderate, the sweetness of fruits and vegetables is moderate, the taste is good, and they are resistant to storage. Long-term use of biogas residue fertilizer can also improve the soil structure, fertility and fertility, and enhance soil water conservation and fertilizer retention. In addition, biogas slurry is a kind of fertility liquid, which not only contains abundant soluble inorganic salts, but also contains a variety of biochemical products that are fermented by biogas. It has the characteristics of being easily absorbed by crops, nutrition, and stress resistance. Spraying plants with biogas slurry can play a role in insecticidal and bacteriostatic action, reduce the amount of pesticides used, and reduce pesticide residues.
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