Allied & ICAR Exam Bank • ALLIED_1250 MCQ • 1 Mark

Section 5: Irrigation and Drainage Engineering

Soil-Water-Plant Relationship

Subtopic: Hygroscopic Coefficient

Question Statement:

Hygroscopic water in agricultural soils is held at suction tensions exceeding:

Options:

  • (A) 31 bar (3100 kPa)
  • (B) 0.33 bar
  • (C) 1.0 bar
  • (D) 0.05 bar

Answer Key:

A

Step-by-Step Solution & Explanation

Hygroscopic moisture is adsorbed as a tight microscopic molecular film directly onto dry mineral soil particle surfaces at tensions above $31\text{ atmospheres}$, rendering it completely unavailable to plants.
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