Q.

Calcium salts used as fertilizer is –

A. Calcium Carbide
B. Calcium Carbonate
C. Calcium Cyanide
D. Calcium Sulphate
Answer» D. Calcium Sulphate
Explanation: Sulphur (as sulphate) is a major plant nutrient, and is essential for crop growth. Calcium Sulphate (gypsum) is used to improve soil quality. Calcium sulphate acts as a pH buffer, which can contribute to neutralizing both soil alkalinity and acidity. It is mainly used for the reclamation of sodic soils through ion exchange (calcium replacing sodium).
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