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The “Dual Kc” method Splits <br />Soil Evaporation from Transpiration <br /> <br />10/24/2016 <br />Basal Kc Curve <br />(Kcb) <br />Wet Soil <br />Evaporation <br />“Spikes” <br /> (Ke) <br />K c <br />130 150 170 190 210 230 250 0.0 <br />0.2 <br />0.4 <br />0.6 <br />0.8 <br />1.0 <br />1.2 <br />0 <br />40 <br />80 <br />120 <br />160 <br />200 <br />Day of the Year Precipitation and Irrigation, mm Sweet Corn Kimberly, Idaho, 1976 <br />I <br />I <br />I <br />I I <br />I <br />I <br />P P P <br />I <br />I <br />Evap.=18% <br />data courtesy of Dr. J.L. Wright, USDA-ARS <br />“Mean” Kc Curve <br /> Kc = KsKcb + Ke