Allied & ICAR Exam Bank • ALLIED_0577
MCQ • 1 Mark
Section 5: Irrigation and Drainage Engineering
Agricultural Drainage and Salinity
Subtopic: Agricultural Drainage and Salinity
Question Statement:
According to USSL criteria, a soil is classified as 'Saline' (non-sodic) when:
Options:
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(A) Electrical conductivity $EC_e > 4.0\text{ dS/m}$, Exchangeable Sodium Percentage $ESP < 15\%$, and $pH < 8.5$
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(B) $EC_e < 4.0\text{ dS/m}$ and $ESP > 15\%$
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(C) $EC_e > 4.0\text{ dS/m}$ and $ESP > 15\%$
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(D) $pH > 10.0$
Step-by-Step Solution & Explanation
Saline soils have high soluble salts ($EC_e > 4\text{ dS/m}$ at $25^\circ\text{C}$), low sodium ($ESP < 15\%$, $SAR < 13$), and neutral-to-slightly alkaline $pH < 8.5$.
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