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Which set lists the primary plant macronutrients?

ACalcium, magnesium, sulfur
BBoron, copper, zinc, iron
CNitrogen, phosphorus, potassium
DSodium, silicon, cobalt
Answer & Solution
Correct answer: C. Nitrogen, phosphorus, potassium
Nitrogen, phosphorus and potassium are used in the largest amounts and so limit growth most often.
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