This standard specifies test methods for the determination of total nitrogen, phosphorus and potassium content of water-soluble fertilizers. This standard is applicable to the determination of total nitrogen, phosphorus and potassium content in liquid or solid water-soluble fertilizers.
NY/T 1977-2010 history
2010NY/T 1977-2010 Water-suluble fertilizers-Determination of total nitrogen, phosphorus and potassium content