Abstract
Leaves were sampled from Thompson Seedless grapevine shoots three times during a two year period at two widely different locations in order to make estimates of leaf area. Linear length and width measurements were made of all leaves from each of 94, 36 and 23 shoots collected respectively at bloom and véraison, 1981 in Davis and bloom, 1982 in Fresno County. Linear regressions were calculated for each shoot with leaf area as the dependent variable and several linear leaf measurements as the independent variables. All independent variables were highly correlated to leaf area (P < .001); however, the product of leaf length and width consistently gave the highest r values. An analysis of variance of the regression coefficients using length x width as the independent variable indicated that vine to vine variance was usually not significant (P > .05). Cane variation within vines was also not significant. Mean slope and intercept values were calculated for each data set resulting in a single linear regression model for each of the three samples. A Bonferroni general multiple comparison procedure showed no significant differences among the three models. Calculated leaf area found using the ratio of fresh weight-to-unit leaf area was not significantly different than predicted leaf area based on foliometer measurements.
- Received June 1983.
- Copyright 1984 by the American Society for Enology and Viticulture
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