where n is the number of days since the last watering; E, the daily evaporation from an
unscreened class A Pan situated about 40 m from the crop; Kc, crop coefficient, which
varied from 0.45 to 1.15 in relation to the phase of the crop’s biological cycle; Kp,
correction coefficient in relation to evaporation, which is 0.8 in the Mediterranean area