Field water use efficiency (FWUE) is calculated by

A. $$\frac{{\text{Y}}}{{{\text{WR}}}}$$

B. $$\frac{{\text{Y}}}{{{\text{ET}}}}$$

C. $$\frac{{\text{Y}}}{{{\text{IR}}}}$$

D. None of the above

Answer: Option B

Solution(By Examveda Team)

The field water use efficiency (WUE) is the ratio between the dry matter production of a plant (the output) divided by evapotranspiration. Thus the equation for WUE is:
$${\text{WUE}} = \frac{{\text{Y}}}{{{\text{ET}}}}$$
Y = Dry matter production (kg/ha)
ET = Evapotranspiration (in mm)