Fish protein organic liquid fertilizer is a natural fertilizer. It is also a functional fertilizer. It can be used as base fertilizer, topdressing fertilizer, irrigating root, drip irrigation and spraying foliar spray. Fish protein fertilizer is rich in organic matter, fish protein, polypeptides, etc. after being applied to the soil, it greatly increases the content of soil organic matter, can quickly promote the reproduction of soil microorganisms, activate soil nutrients to a great extent, increase soil fertility and improve the ability of soil fertilizer and water conservation. The use of fish protein fertilizer can effectively improve the problem of soil hardening, Keep the soil fertility fresh.