In fact, the mushroom substrate mainly consists of various plant residues, such as cottonseed hulls, sawdust, rice bran, straw, etc. They contain many macromolecular substances like cellulose, hemicellulose, lignin and pectin, etc. And in the process of mycelial growth, enzymolysis will decompose them into small molecular sugars, acids, alcohols, etc. Which have rich nitrogen, phosphorus, calcium, potassium, silicon and other mineral elements and are easier to absorb by crops and plants. So organic fertilizer produced with mushroom waste can greatly facilitate the growth of crops.