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9Water scarcity in semiarid regions of Europe threatens the sustainability of fruit tree 10 orchards unless irrigation water is optimized and scheduled in deficit irrigation strategies. 11Stomatal conductance (g s ) is one of the best indicators of plant water stress, since it is placed 12 in the crossroad between water and CO 2 fluxes at the leaf level. Unfortunately, it is not 13 possible to measure g s automatically and continuously, which reduces its potential for 14

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