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Article

Rootstock-Scion Interactions Concerning Wine Making. I. Juice Composition Changes and Effects on Fermentation Rate with St. George and 99-R Rootstocks at Two Nitrogen Fertilizer Levels

C. S. Ough, L. A. Lider, J. A. Cook
Am J Enol Vitic.  1968  19: 213-227  ; DOI: 10.5344/ajev.1968.19.4.213
C. S. Ough
Department of Viticulture and Enology, University of California, Davis.
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L. A. Lider
Department of Viticulture and Enology, University of California, Davis.
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J. A. Cook
Department of Viticulture and Enology, University of California, Davis.
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Abstract

The brush-wt/crop-wt ratio as influenced by rootstock and fertilizer treatment can be correlated to the chemical composition of the grapes. An analysis of covariance of regression data of the ogarithm brush wt/crop wt to total nitrogen in the juice indicated that this relationship was independent of variety with respect to principal (slope of regression lines). It was postulated that the significant elevation changes in these regression data were due primarily to leaf-area brush-wt variety differences or differences in pruning. The more vigorous rootstock (`St. George') yields fruit with more total nitrogen, total acid, tannin, potassium phosphorus, ammonia, and biotin, and a higher pH. The ammonium nitrate treatment had only a small effect, the only significant response being an increase in total nitrogen in the juice for the treated vines. A significant effect of year X fertilizer on ammonia content of the juice was found. The choice of rootstock for a wine variety can alter the juice composition significantly and thus affect the fermentation rate of the must to an economically important degree.

  • Accepted November 1968.
  • Published online January 1968
  • Copyright 1968 by the American Society for Enology and Viticulture

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Vol 19 Issue 4

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Rootstock-Scion Interactions Concerning Wine Making. I. Juice Composition Changes and Effects on Fermentation Rate with St. George and 99-R Rootstocks at Two Nitrogen Fertilizer Levels
C. S. Ough, L. A. Lider, J. A. Cook
Am J Enol Vitic.  1968  19: 213-227  ; DOI: 10.5344/ajev.1968.19.4.213
C. S. Ough
Department of Viticulture and Enology, University of California, Davis.
  • Find this author on Google Scholar
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L. A. Lider
Department of Viticulture and Enology, University of California, Davis.
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J. A. Cook
Department of Viticulture and Enology, University of California, Davis.
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Rootstock-Scion Interactions Concerning Wine Making. I. Juice Composition Changes and Effects on Fermentation Rate with St. George and 99-R Rootstocks at Two Nitrogen Fertilizer Levels
C. S. Ough, L. A. Lider, J. A. Cook
Am J Enol Vitic.  1968  19: 213-227  ; DOI: 10.5344/ajev.1968.19.4.213
C. S. Ough
Department of Viticulture and Enology, University of California, Davis.
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
L. A. Lider
Department of Viticulture and Enology, University of California, Davis.
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
J. A. Cook
Department of Viticulture and Enology, University of California, Davis.
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
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