Allied & ICAR Exam Bank • ALLIED_0490 NAT • 2 Marks

Section 5: Irrigation and Drainage Engineering

Crop Water Requirement

Subtopic: Crop Water Requirement

Question Statement:

A crop has consumptive water use $ET_c = 50\text{ mm}$ during a growth cycle. Effective rainfall is $P_e = 15\text{ mm}$ and leaching requirement is zero ($LR = 0$). If application efficiency is $\eta_a = 70\%$, the Gross Irrigation Requirement (GIR) in mm is:

Answer Key:

50

Step-by-Step Solution & Explanation

$NIR = 50 - 15 = 35\text{ mm}$. $GIR = 35 / 0.70 = 50.0\text{ mm}$.
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