Question

The parameters of N use efficiency are
(A). Appaent 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:

Remember that Agronomic Efficiency (AE) is the most common parameter used by agronomists because it directly measures economic yield output against fertilizer cost.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Nitrogen Use Efficiency (NUE) measures how effectively crops absorb and utilize applied nitrogen fertilizer to produce biomass or economic yield.

Step 2: Detailed Explanation:
NUE is evaluated using several distinct parameters:
- (A) Apparent N recovery efficiency (ANR): Measures the percentage of applied nitrogen that is absorbed by the crop.
- (B) Agronomic efficiency (AE): Measures the economic yield increase per unit of nitrogen fertilizer applied.
- (C) Production efficiency (PE): Measures the total biological biomass produced per unit of nitrogen absorbed.
- (D) Physiological efficiency (PE): Measures the yield increase per unit of nitrogen absorbed by the plant.
Because all four options are standard quantitative indices used to define and evaluate fertilizer nitrogen efficiency, they are all correct.

Step 3: Final Answer:
Hence, the correct option is (C), which includes (A), (B), (C), and (D).