Question

The following are statements on fertilizer N use efficiency of crops. Which statement or the combinations are true?
(A) Partial factor productivity does not account for soil N-supply
(B) Agronomic efficiency requires data on soil N supply
(C) For soil N supply, the N-balance index is useful
(D) Soil N supply does not vary across soil types
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:

Soil physical and biological properties vary significantly across different soil classes.
Therefore, any statement claiming that "Soil N supply does not vary across soil types" is factually incorrect.
Excluding (D) immediately points to the correct option.

Answer 1

The Correct Option is B