A type of fertilizer made by microbial decomposition or fermentation of organic matter (manure). China is also known as manure.

　　Its characteristics are: a wide range of raw materials, large quantity of nutrients, low content, the effect of late and long, must be decomposed by microorganisms after the absorption of plants, to be able to change soil fertility. The commonly used natural fertilizer varieties are green manure, human fecal urine, manure, compost, composting, biogas fertilizer and waste fertilizer.