Question

In irrigation scheduling, the 'Crop Coefficient (Kc)' is used along with reference evapotranspiration (ETo) to estimate actual crop water requirement (ETc). Which of the following correctly describes how Kc typically varies across the crop growth stages?

A Kc remains constant throughout the crop's life cycle regardless of growth stage
B Kc rises from the initial stage, peaks at mid-season, then declines
C Kc is highest at germination and decreases continuously thereafter
D Kc has no relationship with crop growth stage
E Kc is always greater than 2.0 for all field crops
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