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Many prefixes such as mineral, inorganic, or chemical are often used to describe fertilizersand these are used interchangeably.
Fertilizer grade is an expression referring to the legal guarantee of the available plant nutrients expressed as a percentage by weight in a fertilizer, e.g. a 12-32-16 grade of NPK complex fertilizer indicates 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.
NPK 16-18-6. 20-10-10, 15-15-15 Fertilizers


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