Technical Report
 

Canopy Management Practices and Vine Performance [1996-1997]

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https://ir.library.oregonstate.edu/concern/technical_reports/k0698879n

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  • A factorial design was used to vary leaf canopy structure of mature Pinot noir grapevines during two consecutive seasons: shoot tipping at full bloom (yes or no), lateral shoot length (no laterals, laterals cut back to 4 leaves at full bloom, laterals allowed to grow undisturbed) and cluster zone leaf removal (leaf removal in the cluster zone or no leaf removal). Shoot tipping at bloom had the greatest effect on yield components, fruit composition, and vegetative growth. Tipping increased percent fruit set, berries per cluster, cluster weight, and yield to pruning ratio in both seasons. Shoot tip removal increased early shoot growth in the second season, main and lateral leaf size, and the contribution of lateral leaves to total leaf area. Tipping decreased the number of shoots per vine in the second season, clusters per vine in both seasons, must soluble solids, total amount of sugar exported with fruit harvest, leaf area per vine, pruning weight, and cane weight and length at mid-ripening. Increasing lateral shoot length increased must soluble solids in both seasons and dormant cane diameter the following winter. Vines with long laterals had lower yield to pruning ratios in the first season. Percent fruit set increased only in the absence of vegetative growing tips, either from the main or from lateral shoots. Leaf removal in the cluster zone four weeks after bloom had no impact on yield components but reduced must soluble solids in both seasons. It also reduced yield to pruning ratios in the first season and dormant cane diameter in the second season. Non-structural carbohydrate concentration in the permanent structure was not affected by any of the treatments but total content in the trunk increased with increasing lateral shoot length.
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