A) % of Ca, Mg, P
B) % of N, S, P
C) % of N, P, K
D) % of Fe, Mg, K
Correct Answer: C
Solution :
The important elements need to be replenished in crop fields are nitrogen, phosphorus and potassium. These are grouped as nitrogenous fertilizers, phosphate fertilizers and potash fertilizers. These are abbreviated as NPK.
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