Discussion
A fertile soil must contain all the 3 major nutrients namely __________ for basic plant nutrition, in addition to 9 key micro nutrients.
Answer: C
The three major nutrients are Nitrogen, Phosphorus, Potassium.
Nitrogen (N), phosphorus (P) and potassium (K) are the primary macronutrients. Plants need them in the largest amounts, soils most often run short of them, and they are the three figures printed on a fertiliser bag as its NPK grade.
Calcium and sulphur are secondary macronutrients, needed in smaller amounts, and iron is a micronutrient. Every other option mixes one of these into the primary trio.
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