Discussion
Assertion (A): Urea applied to a wet soil surface can lose a substantial part of its nitrogen.
Reason (R): Urease in the soil hydrolyses it to ammonia, which volatilises if it is not incorporated.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. Urease is abundant in soil and crop residues, and it hydrolyses urea to ammonium carbonate within a day or two; at the surface the ammonia escapes to the atmosphere rather than being held on the exchange sites. Losses of twenty per cent or more are common. Incorporating the urea, watering it in, or using a urease inhibitor all prevent it.
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