Abstract
Growth and tissue elemental concentrations of Seyval Blanc grapevines were studied at four nutrient solution concentrations each of N, K, and Mg. Generally, increasing solution concentrations of N, K, or Mg resulted in increased plant growth as measured by total linear shoot growth and total plant dry mass. High solution concentrations of K (700 mg/L) depressed growth in comparison to lower (117-235 mg/L) K concentrations. High N (600 mg/L) or high Mg (150 mg/L) solution concentrations did not produce a similar growth depression. Foliar concentrations of N, K, and Mg were significantly and positively correlated with solution concentrations of the respective element. Plants expressing symptoms of N deficiency had foliar N concentrations greater than critical foliar N concentrations established for other grapes. Similarly, foliar K concentrations in K deficient vines were greater than foliar K concentrations reported elsewhere for healthy V. labrusca and V. vinifera vines. Foliar Mg concentrations of plants showing Mg deficiencies were similar to values reported for other grapes. Critical N and K concentrations of Seyval, below which N and K deficiencies may occur, may, therefore, be higher than critical values established for some grape species.
- Received March 1983.
- Copyright 1983 by the American Society for Enology and Viticulture
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