At the orchard-scale, diurnal variation in WUE was not correlated with VPD during the tree flowering stage, but was highly correlated with VPD during the robust growth stage
VPD decreases causing a resulting increase in WUE and net ecosystem carbon exchange capacity
found that WUE decreased as water irrigation increased
causing a resulting decreases in WUE and net ecosystem carbon exchange capacity
found that seasonal WUE was positively correlated with seasonal precipitation
the crop coefficient varied according to tree age, tree spacing, growth stage within a season, and local weather conditions . Clearly, there are many determinants of calculated crop coefficients orchard.