Abstract
Date palm is one of the most important crops in Saudi Arabia, and with limited water resources, it becomes necessary to determine its water requirements, ETc. Field experiment was conducted at a farm of date palm during 2014 to determine its water requirements and estimate crop coefficient (Kc) in Qassim region, central Saudi Arabia. The cumulative evapotranspiration estimated by Penman-Monteith's model was higher by 26.87 % compared to the value obtained by usingBlaney– Criddle equation. The average of potential evapotranspiration estimated by Penman-Monteith's model was higher by 26.7% than that determined by usingBlaney–Criddle equation.The average monthly values ofETc for Kc2 estimated by both methods were lower than the values for Kc1 and Kc3every month.The values of the cumulative crop evapotranspiration estimated byPenman-Monteith's model (PM) and Blaney–Criddle equation (BC) were similar for Kc1 and Kc3.
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