Question

What is the water use efficiency, if grain yield of a crop is 6 ton/hectare and water requirement for growing the crop is 2000 mm?

• A. 3 kg/he-mm
• B. 0.003 kg/he-mm
• C. 3 t/he-mm
• D. 0.3 kg/he-mm

Hint:

Water Use Efficiency = \[ \frac{\text{Grain Yield (kg/he){\text{Water Use (mm) \] Convert tons to kg and ensure consistent units!

Answer 1

The Correct Option is D

Yield = 6 tons = 6000 kg per hectare.

Water use = 2000 mm. 

Water Use Efficiency (WUE) = \( \frac{6000 \, \text{kg}}{2000 \, \text{mm}} = 3 \, \text{kg/mm} \) 

Expressed per hectare per mm: \({0.3 \, \text{kg/he-mm}} \)