Natural decomposition of organic matter by micro-organisms or fermentation by a class of fertilizers. China, also known as manure. Its characteristics are as follows: raw material source of a wide number of major; nutrient-wide, low; effect no later than the long, shall be subject to microbial decomposition of plant transformation can be absorbed; better soil fertility. Commonly used green manure varieties of natural fertilizers, human waste, manure, compost, composting, biogas, such as manure and fertilizer waste.













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