Honors College Thesis
 

The effects of nitrogen, tillage and irrigation on the color of Willamette Valley Pinot noir wine

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  • Various vineyard practices influence the quality of a wine. In 1999, three levels of nitrogen (N), two levels of tillage and two levels of irrigation were applied to Pinot noir grape cultivars at Benton Lane Vineyards in the Southern Willamette Valley. N treatments were zero, soil and foliar applications. Every other row was tilled by machine. Those vines that were irrigated received 0.5 gal/hr of water for 200 hours during ripening in August. The grapes were harvested and wines were fermented from three replicates of each treatment. Spectrophotometric readings at 420nm and 520nm were used to determine the "Color Intensity" and "Hue." Ten untrained but experienced panelists rated the "Overall Color Intensity," "Purple Hue," and "Garnet Hue" of the wines using a traditional 16-point intensity scale. The panelists' intensity ratings indicated that N and irrigation had a significant effect on the Overall Color Intensity and Purple Hue of the wine. There were no significant differences in Garnet Hue intensity among the wines. The instrumental results were correlated with the panelists' ratings and clearly indicated that a direct correlation exists between the measured Color Intensity and the sensory analyses of Overall Color Intensity and Purple Hue. Soil N application and no irrigation contributed most to the high color intensity of Willamette Valley Pinot noir wine studied.
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