Which one of the following is not used as fertilizer?

Which one of the following is not used as fertilizer?

Ammonium nitrate
Ammonium sulphide
Ammonium phosphate
Ammonium sulphate
This question was previously asked in
UPSC NDA-2 – 2018
Fertilizers are substances used to provide essential nutrients to plants, primarily nitrogen (N), phosphorus (P), and potassium (K).
A) Ammonium nitrate (NH₄NO₃) is a common nitrogen fertilizer.
B) Ammonium sulphide ((NH₄)₂S) contains nitrogen and sulfur, but it is highly unstable and decomposes easily to ammonia and hydrogen sulfide gas. Due to its instability and potential toxicity (hydrogen sulfide), it is not used as a common agricultural fertilizer.
C) Ammonium phosphate (e.g., (NH₄)₂HPO₄ or NH₄H₂PO₄) are common fertilizers (like DAP and MAP) providing both nitrogen and phosphorus.
D) Ammonium sulphate ((NH₄)₂SO₄) is a common fertilizer providing nitrogen and sulfur.
Therefore, Ammonium sulphide is not used as a fertilizer.
Common fertilizers contain essential plant nutrients, primarily nitrogen, phosphorus, and potassium, often in the form of stable salts. Ammonium compounds are often used as sources of nitrogen, but their suitability as fertilizers depends on their stability and chemical properties in soil.
While ammonium sulphide contains nitrogen and sulfur, its instability makes it unsuitable for agricultural application. It is more relevant in laboratory chemistry or specific industrial processes rather than widespread use as a soil nutrient source.
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