We conclude that multiplicative models considering the
addition of cross terms are more applicable over a wide
range of stress conditions, especially when irrigation water
stress is applied during two or more phenological stages;
meanwhile, the simple models without considering crossterm
addition would be feasible when DI stress is applied
only during one of these stages. Also, assuming the
relationship between water stress and yield loss, we deduce
that flowering and fruit growth periods are more sensitive
to DI than is the ripening period. Thus, the models
developed could be considered a preliminary step for
achieving precise sustainable water management under DI
programmes in citrus cultivation, especially in situations of
water scarcity, which are occurring with alarming frequency
in semi-arid areas