Which component of fertilizer is used for stimulating early growth purpose?

Question

Which component of fertilizer is used for stimulating early growth purpose?

1. A. Potassium
2. B. Nitrogen
3. C. Oxygen
4. D. Phosphorus (Correct answer)

Correct Answer

Option D — Phosphorus

Detailed Solution & Explanation

The correct answer is Phosphorus.

Key Points

• Phosphorus is the nutrient in fertilizers primarily responsible for stimulating early growth, especially strong root development, and for flowering, fruiting and seed formation.
• It plays a central role in energy transfer within the plant (as part of ATP).
• The three primary macronutrients are often remembered as N-P-K: Nitrogen (N) promotes leafy, vegetative (green) growth; Phosphorus (P) promotes roots and early growth; and Potassium (K) improves overall plant vigour, disease resistance and water regulation.
• Oxygen is not a fertilizer nutrient in this sense.
• Since the question asks specifically about stimulating early growth, the answer is Phosphorus, option (D).

Additional Information

• The three primary macronutrients and their roles: Nitrogen (N) drives leafy vegetative growth, Phosphorus (P) promotes root development and early growth, and Potassium (K) supports flowering, fruiting and disease resistance.
• The mnemonic is "Up, Down, All Around" — N up (shoots), P down (roots), K all around (overall health).
• Phosphatic fertilisers in India are largely DAP and single superphosphate, and their heavy import dependence makes them a recurring current-affairs topic.