Technical Report
 

Yield Adjustment

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https://ir.library.oregonstate.edu/concern/technical_reports/rf55z891s

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  • In the past ten years, variation in Oregon vineyard yields has come from two main causes: winter injury and inconsistent fruit set. Together these factors have caused significant yield variation in almost every Oregon vineyard. In 1991, a research project was started at Oregon State to develop and evaluate a method of reducing yield variability. The project grew out of previous research trials on yield prediction, canopy management, and yield-quality relationships. These trials had demonstrated three key points: 1) yields could be predicted with an adequate level of accuracy by using cluster counts and estimates of cluster weight at lag phase of berry development, 2) the temporary presence of extra canes can reduce the growth and canopy of the remaining canes, and 3) divided canopies could produce wines comparable to single canopies at higher yields. Using this information we developed a modification of the Scott Henry Trellis system, a vertically divided canopy that is easy to establish in a vertically trained vineyard. The system uses the bottom canopy of the Scott Henry Trellis as a yield buffer. In low yield years the bottom canopy is retained and the system is treated just like a normal Scott Henry system. In high yield years the lower canopy is partially or wholly removed based on yield estimates. The presence of the lower canopy, even for only part of the season in a high yield year, will reduce the vegetative growth on the upper canopy. This should result in wine quality improvements. The objectives of the 1992 research were to test our ability to crop at a target crop level and to determine if the resulting crop level and canopy had an impact on grape and wine composition.
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