Changes in must composition during ripening of 'Tempranillo' grapevines as a function of two irrigation treatments

The change in berry composition from veraison to harvest as affected by water availability was studied during the 2003-growing season. The study was conducted near Madrid, Spain at an elevation of 600 m above sea level. 'Tempranillo' grapevines grafted onto '110R' were used. Two irrigation treatments were used: 0.4 (T1) and 0.2 (T2) of reference evapotranspiration (ET0). Irrigation was initiated when shoot growth ceased. Changes in berry weight, total soluble solids, titratable acidity, pH and phenolic compounds were determined weekly beginning at veraison. Photosynthesis, leaf area index and yield and yield components were measured. There were no significant differences in must composition, hence juice quality, and yield between the treatments.