Abstract
Diurnal cycles of leaf and cluster water potential and K+ concentrations of xylem exudates and berry juice were investigated on K fertilized and control Shiraz vines in a cool, dryland vineyard (Eden Valley) and a hot, irrigated vineyard (Waikerie). Fertilized vines exhibited more severe water stress, and the berry juice K+ contents varied diurnally as a linear function of water stress. Regional and maturity effects on diurnal patterns of K+ content of exudates and juice were observed. Potassium fertilizing of vines did not significantly affect the K+ concentration of leaf or cluster xylem exudates or berry juice.
- Received August 1980.
- Copyright 1984 by the American Society for Enology and Viticulture
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