Allied & ICAR Exam Bank • ALLIED_1239 NAT • 2 Marks

Section 5: Irrigation and Drainage Engineering

Agricultural Drainage and Salinity

Subtopic: Exchangeable Sodium Percentage

Question Statement:

A soil has a Cation Exchange Capacity $CEC = 20\text{ meq}/100\text{g}$ and exchangeable sodium content of $4.0\text{ meq}/100\text{g}$. The Exchangeable Sodium Percentage ($ESP = \frac{\text{Ex. Na}}{CEC} \times 100$) is:

Answer Key:

20.0

Step-by-Step Solution & Explanation

$ESP = \frac{4.0}{20.0} \times 100 = 20.0\%$. (An ESP
gt; 15\%$ classifies the soil as sodic).
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