Allied & ICAR Exam Bank • ALLIED_1215 NAT • 2 Marks

Section 5: Irrigation and Drainage Engineering

Agricultural Drainage and Salinity

Subtopic: Leaching Requirement

Question Statement:

An irrigation water has electrical conductivity $EC_{iw} = 1.5\text{ dS/m}$. The crop can tolerate an electrical conductivity of the drainage water up to $EC_{dw} = 6.0\text{ dS/m}$. The leaching requirement ($LR = \frac{EC_{iw}}{EC_{dw}}$) expressed as a percentage is:

Answer Key:

25

Step-by-Step Solution & Explanation

$LR = \frac{EC_{iw}}{EC_{dw}} = \frac{1.5}{6.0} = 0.25$ or $25\%$.
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