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The three major components that are necessary in a fertilizer are?

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The three major components that are necessary in a fertilizer are?

(a) Na, K, S

(b) N, P, S

(c) N, Cl, K

(d) N, P, K

This question was addressed to me during an online exam.

This is a very interesting question from Inorganic Chemicals topic in chapter Chemical Industries of Chemical Technology

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The correct choice is (d) N, P, K

Best explanation: Nitrogen promotes development of stems and leaves, Phosphorus stimulates early growth and accelerates seeding and Potassium is essential for development of grains, sugars etc.

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