Question Bank • QB_SUB_IDE_0049 MCQ • 1 Mark

Section 5: Irrigation and Drainage Engineering

Agricultural Drainage

Subtopic: Leaching requirement and salinity control

Question Statement:

A soil is classified as 'Saline-Sodic' when:

Options:

  • (A) $EC > 4.0\text{ dS/m}$, $SAR > 13$ (or $ESP > 15\%$), and $pH < 8.5$
  • (B) $EC < 4.0\text{ dS/m}$ and $ESP < 15\%$
  • (C) $pH > 10.0$ and zero soluble salts
  • (D) $SAR < 2$ and $EC = 0$

Answer Key:

A

Step-by-Step Solution & Explanation

Saline-sodic soils have high soluble salts ($EC > 4.0\text{ dS/m}$) and high exchangeable sodium ($ESP > 15\%$, $SAR > 13$), typically maintaining $pH \le 8.5$ due to excess neutral salts.
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