Abstract
Carbon isotope ratio (δ13C) has been increasingly used in the study of grapevine water relations, and the main challenge for physiologists and agronomists is now to harness the information δ13C provides. One of the fields where δ13C can be more useful is modelling, as in this discipline, measuring plant water status with a sufficient frequency is not usually feasible. The aim of this work is to evaluate the interest of including δ13C data on modelling of three relevant agronomical variables such as yield, berry weight and sugar concentration (TSS) at three scales: within-vineyard, at domain and at regional scale. The models calculated showed that δ13C is a useful tool for modelling variations in yield and berry weight at the three scales, but this ability was not observed for modelling sugar concentration. The fact δ13C had a relevant role in berry weight modelling at the three scales needs to be highlighted, and underlines the great relevance water availability has in Mediterranean viticulture.
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