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Agronomy QUESTION #2026
Question 1
Irrigation water use efficiency (WUE) is formally defined as:
  • The ratio of water stored in the root zone to total water applied
  • The ratio of economic crop yield to the total amount of water consumed by evapotranspiration
  • \(\dfrac{\text{Crop yield (kg/ha)}}{\text{Water applied (mm or m}^3\text{)}}\) expressed as kg per mm or kg per \(m^3\)✔️
  • The ratio of water infiltrated to water applied at the field inlet
Correct Answer Explanation
Water use efficiency (WUE) = \(\dfrac{\text{Yield (kg/ha)}}{\text{Water applied or consumed (mm)}}\). It measures how efficiently water is converted into economic yield. Maximizing WUE is critical in water-scarce environments and forms the basis of deficit irrigation strategies.