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Estimation of crop evapotranspiration (ETc) <br />(with water stress) <br /> <br />where Ks is a water stress coefficient (0 to 1) <br /> <br /> <br /> <br /> <br /> <br />ETc = ETr x Kcr x Ks <br /> <br />PAW <br />PAW <br />s dMAD <br />DdKmax*1 <br />max <br /> <br /> <br />max dPAW = maximum depth of plant available water; dFC – dPWP <br />D = soil water deficit; dFC – dw <br />MAD = management allowed depletion (decimal fraction) <br /> <br />Note: Ks should be set equal to 1 if D < dMAD. A Ks of 1 <br />means that there is no water stress. The Ks will work with <br />both alfalfa or grass references and crop coefficients.