Evapotranspiration constitutes the most significant component of the hydrologic budget apart from precipitation. It is an important climaticfactor and its accurate estimates are needed to determine the water requirement of crops for irrigation scheduling. The Food and Agriculture Organization (FAO) recommends the use the FAO-56 Penman Monteith method for estimating reference evapotranspiration (ET o ) (Allen et al., 1998). This method is the most widely used in the world and has been proven to accurately estimate
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