Abstract
Irrigation of crops in arid regions with marginal water is expanding. Due to economic and environmen- tal issues arising from use of low-quality water, irrigation should follow the actual crop water demands. However, direct measurements of transpiration are scant, and indirect methods are commonly applied; e.g., the Penman-Mon- teith (PM) equation that integrates physiological and mete- orological parameters. In this study, the effects of environ- mental conditions on canopy resistance and water loss were experimentally characterized, and a model to calculate palm tree evapotranspiration eT c was developed. a novel addition was to integrate water salinity into the model, thus accounting for irrigation water quality as an additional fac- tor. Palm tree eT c was affected by irrigation water salin- ity, and maximum values were reduced by 25 % in plants irrigated with 4 dS m −1 and by 50 % in the trees irrigated with 8 dS m −1 . results relating the responses of stomata to
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