Abstract
Three excessive rates of potassium (K) were applied throughout the growing season to two-year-old containergrown Concord (Vitis labrusca L.) vines. Excessive K resulted in an increase in the K levels and a decrease in the magnesium (Mg) levels of leaves, petioles, canes, trunks and roots at fruit harvest and, to a lesser extent, during dormancy. Potassium levels in petioles correlated better with K and pH in fresh and stored juice than did the K levels in other plant parts. Excessive K levels in the juice were detrimental to fresh and stored juice pH and color quality. High juice pH levels, created by the excessive K fertilization, produced problems in color stability during storage
- Received June 1982.
- Copyright 1983 by the American Society for Enology and Viticulture