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Vine response to increased node numbers

, : Vine response to increased node numbers. American Journal of Enology & Viticulture 35(3): 161-163

Five grape cultivars pruned to 43-151 nodes/vine gave different yield responses. 'Chardonnay' and 'Gewuerztraminer' had a linear relationship and doubling nodes doubled yield. A similar relationship appeared to occur initially with 'Cabernet Sauvignon', 'Mueller Thurgau' and 'Sauvignon blanc', but diminishing response began to be manifested at .apprx. 40, 40-60 and 80-90 nodes/vine, respectively. If more nodes were left on a vine at winter pruning, fewer formed shoots the following spring. While this was consistent for the 5 cultivars studied, some of these were still able to respond by increasing their yields in direct proportion to the higher node numbers. They did this by having more fruit on each shoot. The major contribution to this fruit increase was bunch number, although individual bunch weight made a small contribution.

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