Classification of Organic Fertilizers and Implementation Standards

Organic fertilizers in a broad sense are mainly divided into the following four categories.

(1) Organic fertilizer (also called commercial organic fertilizer, refined organic fertilizer, industrial organic fertilizer), the implementation of the standard NY 525-2021, divided into powder and granules of two kinds. Technical indicators: organic matter (based on drying) ≥ 30%; total nutrients of nitrogen, phosphorus and potassium (N + P2O5 + K2O) (based on drying) ≥ 4.0%; moisture ≤ 30%; acidity (pH) 5.5 ~ 8.5.

(2) Bio-organic fertilizer, the implementation of the standard NY 884-2012, divided into two kinds of powder and granules. Technical indicators: organic matter (based on drying) ≥ 40%; effective live bacteria ≥ 0.2 billion / g; moisture ≤ 30%; acidity (pH) 5.5 ~ 8.5.

(3) Organic - inorganic compound fertilizer, the implementation of the standard GB 18877-2009, divided into two types of Ⅰ and Ⅱ. Technical indicators: Type I, total nutrients of nitrogen, phosphorus and potassium (N + P2O5 + K2O) ≥ 15%, organic matter ≥ 20%; Type II, total nutrients of nitrogen, phosphorus and potassium (N + P2O5 + K2O) ≥ 25%, organic matter ≥ 15%; two types, moisture ≤ 12.0%; particle size (1.00mm ~ 4.75mm or 3.35mm ~ 5.60mm) ≥ 70%; acidity (pH) 5.5 ~ 8.0; chloride ion ≤ 3.0%.

(4) Compound microbial fertilizer, the implementation of the standard NY/T 798-2015, divided into liquid or solid two. Technical indicators: Ⅰ liquid, the effective number of live bacteria ≥ 0.5 billion / mL, nitrogen, phosphorus and potassium total nutrients (N + P2O5 + K2O) 6% ~ 20%, the rate of miscellaneous bacteria ≤ 15.0%, valid ≥ 3 months; Ⅱ solid, the effective number of live bacteria ≥ 0.2 billion / g, nitrogen, phosphorus and potassium total nutrients (N + P2O5 + K2O) 8% ~ 25%, organic matter 20%, the rate of miscellaneous bacteria ≤ 30.0%, moisture ≤ 30.0%, validity ≥ 6 months; two types, acidity (pH) 5.5 ~ 8.5.