Question

The parameters of N use efficiency are
(A) Apparent N. recovery
(B) Agronomic efficiency
(C) Production efficiency
(D) Physiological N efficiency
Choose the correct answer from the options given below:

• A. (A), (B) and (D) only.
• B. (A), (B) and (C) only.
• C. (A), (B), (C) and (D).
• D. (B), (C) and (D) only.

Hint:

Nitrogen use efficiency includes multiple measures like recovery, yield increase, and physiological response.

Answer 1

The Correct Option is C

Step 1: Apparent N recovery tracks how much applied nitrogen the crop absorbs.
Step 2: Agronomic efficiency tracks yield gain per unit of nitrogen applied.
Step 3: Physiological and production efficiency track yield or biomass per unit of nitrogen taken up.
Step 4: All four are valid NUE parameters, so option 3 is correct.