Evapotranspiration and Water Stress Coefficient for Deficit-Irrigated Maize

Crop evapotranspiration under deficit soil water conditions must be quantified to accurately manage irrigation and crop stress achieve targeted savings. A coefficient is commonly used quantify the effect of inadequate on evapotranspiration. 6-year field trial maize in northeastern Colorado was derive for maize. Results showed that affected by both current uptake stomatal resistance impact prior plant growth. Measured less than potential when exceeded 25% total available water. curvilinear relationship modeled measured better linear relationship. Prior resulted a reduction canopy ground cover, which linearly related basal coefficient. These combined effects, incorporated into times reference model, were able estimate with irrigation.