How the grades of fertilizer is decided.

1.	How the grades of fertilizer is decided.
Answer» Fertilizer grade is an expression referring to the legal guarantee of the available plant nutrientsexpressed as a percentage by weight in a fertilizer, e.g. a 12-32-16 grade ofNPK complex fertilizerindicates the presence of 12 %nitrogen(N), 32%phosphorous(P2O5) and 16%potash(K2O). On a fertilizer bag, the NPK content is always written in the sequence N, P2O5, K2O. Fertilizers are classified as Straight fertilizers: These contain one of the 3 major nutrients N, P or K. Compound /complex fertilizers: These contain at least two out of the three major nutrients.

Answer»

Fertilizer grade is an expression referring to the legal guarantee of the available plant nutrientsexpressed as a percentage by weight in a fertilizer, e.g. a 12-32-16 grade ofNPK complex fertilizerindicates the presence of 12 %nitrogen(N), 32%phosphorous(P2O5) and 16%potash(K2O). On a fertilizer bag, the NPK content is always written in the sequence N, P2O5, K2O.

Fertilizers are classified as

Straight fertilizers: These contain one of the 3 major nutrients N, P or K.

Compound /complex fertilizers: These contain at least two out of the three major nutrients.

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