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Obtaining ETa from CWSI <br />where: <br />dT = Tc – Ta <br />dTmn = a (VPD) + b <br />dTmx = a (VPG) + b <br />mnmx <br />mn <br />dTdT <br />dTdTCWSI <br /> <br />PaETCWSIET)1( <br />rcrpETKET <br />CWSI range: 0-1, <br />9 <br />Ks = (1- CWSI) <br />ETa = (Kcb Ks) × ETr ETa = actual crop ET, mm/d or in/d <br />ETp = potential crop ET, mm/d <br />Kcr = potential crop coefficient, <br />Kcb = basal crop coefficient, <br />Ks = stress coefficient, <br />Ke = evaporation coefficient