Consumptive Use of Water (CU) is the total quantity of water
used by a crop through transpiration and evaporation
from the soil surface during its entire growing period.
Standard Agronomy Formula
CU = ET + ΔS
Where:
• ET = Evapotranspiration (mm)
• ΔS = Change in soil moisture storage (mm)
Enter Required Data
Important:
• CU is expressed in mm of water
• Used in irrigation scheduling & WUE studies
• Common in ICAR-NET & ARS numerical problems
