Question

Assertion (A): Liming should not be done along with ammoniacal fertilizer application.
Reason (R): Liming leads to volatilisation loss of ammonia.

• A. Both (A) and (R) are true and (R) is the correct explanation of (A).
• B. Both (A) and (R) are true but (R) is NOT the correct explanation of (A).
• C. (A) is true but (R) is false.
• D. (A) is false but (R) is true.

Hint:

Avoid liming and ammoniacal fertilizer application together to prevent nitrogen loss via volatilization.

Answer 1

The Correct Option is A

Step 1: Liming raises soil pH by adding hydroxide or carbonate.
Step 2: Higher pH shifts \( \text{NH}_4^{+} + \text{OH}^{-} \rightleftharpoons \text{NH}_3 + \text{H}_2\text{O} \) toward ammonia gas.
Step 3: This ammonia escapes to air, so combining liming with ammoniacal fertiliser wastes nitrogen.
Step 4: Both statements true, R explains A, matching the first option.