3 research outputs found
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Development of Viticultural Practices to Improve Winegrape Performance : Experiment I: Effect of Trellis Type and Canopy Location on Yield Components, Fruit Composition, Fruit Set, and Shoot Morphology in Pinot noir Grapevines
Five different trellis and training systems were compared in their effect on yield components, fruit composition, fruit set, and shoot morphology in Pinot noir grapevines in 1996 and 1997. This trial was performed on established vines planted on a low-vigor valley floor site, in the Willamette Valley of Oregon. The treatments were: upright vertical, cane pruned (Guyot); upright vertical, spur pruned (Bilateral Cordon); Scott Henry, cane pruned; Lyre, cane pruned; and Geneva Double Curtain (GDC,) cane pruned. The GDC and the Scott Henry had the highest yield, but were not significantly different from the Lyre or Bi-lateral Cordon in 1996. There were no significant differences in yield in 1997. The GDC, Scott Henry, and Lyre had the most clusters per shoot, the GDC had the highest cluster weight and the GDC and Scott Henry had the most berries per cluster in 1996. These differences were not seen in 1997. In 1996, the Scott Henry had significantly higher anthocyanins than did the other systems. There were no significant differences in juice soluble solids, pH, or titratable acidity between the different trellis systems in either year. The three double canopy trellis systems were also evaluated by canopy to determine differences within the vine. In 1996, there were no significant differences in yield components between double canopies within the vine. In 1997, the top canopy of the Scott Henry had a significantly higher titratable acidity and more berries per cluster than did the bottom canopy
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Effect of Canopy Location on Yield Components and Fruit Composition in Pinot noir Grapevines Trained to the Scott Henry Trellis System
Pinot noir vines, trained to the Scott Henry trellising system were separated into four different quadrants: Bottom canopy, trained toward the ground; Top canopy, trained upwards; East orientation, receiving the morning sunlight; and West orientation, receiving afternoon sunlight. Yield components and fruit composition were measured for each canopy, orientation, and then for each quadrant. The bottom canopy had higher yield, cluster weight, titratable acidity, and total sugar per vine, than did the top canopy. Must soluble solids were not significantly different between the two canopies. The top canopy had a significantly higher pH. The East side of the vine, the side that receives direct morning sunlight, had a higher yield, cluster weight, and total sugar per vine than did the West side of the vine. The West side of the vine, the side that receives direct afternoon sunlight, had higher titratable acidity than did the East side of the vine. Must soluble solids were not significantly different between the two sides of the vine. The bottom-east quadrant had a significantly higher yield, and total sugar per vine, than did the other three quadrants
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Development of Viticultural Practices to Improve Winegrape Performance : Experiment II: Effect of Canopy Location on Yield Components and Fruit Composition in Pinot noir Grapevines Trained to the Scott Henry Trellis System
For this trial, established Pinot noir vines, located on the valley floor of the Umpqua Valley in Oregon were used. In 1996 and 1997 sixteen vines trained to the Scott Henry trellising system were separated into four different quadrants, determined by shoot orientation: Bottom canopy, shoots trained toward the ground; top canopy, shoots trained upwards; east orientation, shoots receiving the morning sunlight; and west orientation, shoots receiving afternoon sunlight. Yield components and fruit composition were measured for each quadrant. In 1996, wines were produced from fruit harvested by quadrant and subjected to sensory analysis. In 1996 the bottom canopy had higher yield, cluster weight, and titratable acidity than did the top canopy. In 1997 the top canopy had a higher yield than did the bottom canopy. In 1996 the east oriented canopy had a higher yield, cluster weight, and skin anthocyanins than did the west oriented canopy. Must soluble solids were not significantly different between vine canopy or orientation in 1996. In 1997 the west oriented canopy had higher brix, pH, and lower titratable acidity than the east oriented canopy. The bottom-east quadrant had a significantly higher yield than did the other three quadrants in 1996. There were no significant differences seen in quadrant yields in 1997. Significant differences were seen in wine attributes between the quadrants