Abstract
Over two consecutive seasons, six deficit irrigation regimes were imposed on Colombard vines on Ramsey rootstock. The soil water availability was quantified by logarithmic transformation of the absolute value of a root-weighted measure of soil matric potential. Stem water potential declined linearly with decreasing soil water availability. Water stress indices were calculated by integrating the daily values of soil water availability over specific periods. Declines in both fruit and vegetative growth were linearly correlated with increases in the values of water stress indices during the respective growth periods. In the berries, concentrations of total soluble solids, tartrate and potassium were not correlated with the water stress index during the period of fruit growth; malate concentration declined linearly with increasing values of this index. Responses of pH and titratable acidity to variation in the water stress index were not consistent in the two seasons.
Published Version
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