Data were calculated as the sum of the daily evaporation from class-A open-pan installed nearby the experimental plots. Reference crop evapotranspiration (ET0) values were calculated based on FAO Penman–Monteith method. The crop coefficient, Kc for cucumber was basically determined by the ratio of the crop ETc to the reference ET0, whereas: Kc = ETc/ET0 ( FAO, 1998).