Question Bank • QB_IDE_ADV_055 MSQ • 2 Marks

Section 5: Irrigation and Drainage Engineering

Soil-Water-Plant Relationship

Subtopic: Water requirement of crops

Question Statement:

Which of the following approaches represent scientifically sound criteria for scheduling field crop irrigations?

Options:

  • (A) Management Allowed Depletion (MAD) approach (irrigating when $50\%$ of available soil water is depleted)
  • (B) Soil moisture tension approach (irrigating when tensiometer suction reaches crop-specific threshold values, e.g., $0.50\text{ bar}$)
  • (C) Climatological approach based on irrigation water depth to cumulative pan evaporation ratio ($IW/CPE$, typically $0.70 \text{ to } 0.90$)
  • (D) Critical growth stage approach (ensuring moisture adequacy during stages like Crown Root Initiation in wheat or tasseling in maize)

Answer Key:

A, B, C, D

Step-by-Step Solution & Explanation

All four methods are standard accepted irrigation scheduling protocols in agricultural engineering: - A: Soil moisture depletion (MAD). - B: Soil water potential / tension criteria. - C: Climatological water budgeting ($IW/CPE$ ratio). - D: Phenological critical crop growth stages where drought causes irreversible yield penalties.
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