Fertilizer specifications are primarily defined by three core dimensions: nutrient content, packaging specifications, and the applicable technical standard. Specific parameters vary significantly across different types of fertilizers. Below are the detailed specifications for mainstream product categories:
Specifications for Common Single-Nutrient Fertilizers
Urea: Nitrogen content ≥ 46%; complies with standard GB/T 2440-2017; typically packaged in 40 kg or 50 kg bags; appears as uniform white granules with no significant caking.
Ammonium Bicarbonate: Nitrogen content ≥ 17%; complies with standard GB 3559-2001; packaged in 50 kg bags; must be stored in a sealed container to prevent volatilization.
Diammonium Phosphate (DAP): Total nutrient content ≥ 64% (18% nitrogen, 46% phosphorus pentoxide); complies with standard GB/T 10205-2009; typically packaged in 50 kg bags.
Specifications for Compound/Specialized Fertilizers
General Compound Fertilizers: Categorized into three tiers based on total nutrient concentration-high (≥ 40%), medium (≥ 30%), and low (≥ 25%); comply with standard GB/T 15063-2020; commonly packaged in 25 kg, 40 kg, or 50 kg bags.
Crop-Specific Fertilizers:
Fertilizer for fruit trees: Total nutrient content ≥ 45% (15-5-25); 25 kg/bag.
Fertilizer for corn: Total nutrient content ≥ 40% (30-5-5); 40 kg/bag.
Fertilizer for wheat: Total nutrient content ≥ 40% (18-16-6); 40 kg/bag.
Fertilizer for rice: Common formulations include 18-8-15 and 20-13-8, often enriched with silicon and zinc; packaged in 50 kg bags.
