Question Bank • QB_SUB_IDE_0001 NAT • 2 Marks

Section 5: Irrigation and Drainage Engineering

Soil-Water-Plant Relationship

Subtopic: Consumptive use and evapotranspiration

Question Statement:

For a maize crop at peak vegetative stage, the crop coefficient is $K_c = 0.80$. If the reference crop evapotranspiration is $ET_0 = 5.0\text{ mm/day}$, the crop evapotranspiration $ET_c$ (in mm/day) is:

Answer Key:

4.0

Step-by-Step Solution & Explanation

Crop evapotranspiration: $ET_c = K_c \times ET_0 = 0.80 \times 5.0 = 4.00\text{ mm/day}$
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