Articles
INFLUENCE OF TIMING OF SUMMER HEDGING ON YIELD AND GRAPE QUALITY IN SOME RED AND WHITE GRAPEVINE CULTIVARS
Article number
512_10
Pages
101 – 110
Language
Abstract
Ten-year-old simple curtain trained vines of cultivars Sangiovese, Cabernet Sauvignon, Verdello, Drupeggio and Sauvignon blanc grown in vineyards located in the Umbria region, Central Italy, were hedged one and five weeks after bloom retaining 9–10 leaves per shoot.
For each cultivar, sixty vines on Kober 5BB rootstock, with 30 bud load per vine, were used.
Hedging at the 9–10th node of the main shoots applied precociously, 1 week after bloom, gives good exposure and enhances yield and grape composition.
Cabernet S., Verdello, Drupeggio and Sauvignon blanc showed a good capacity to produce laterals and therefore responded better to early-hedging with increased cluster weight and yield and improved soluble solid, total polyphenol and nitrogen contents.
No effects were observed in Sangiovese that developed few laterals.
Independent of cultivar, with early-hedging, the titratable acidity and pH of the juice were significantly reduced.
In all the cultivars, from flowering to veraison the total leaf area increased more than 3-fold; hedging vines increased lateral growth, and total leaf area was always less than in the control vines (from 15 % to 49 %).The rejuvenation of leaf area following early-hedging and the high photosynthetic activity of the laterals in comparison to primary leaves from veraison to harvest (by 20–40 %) reduced the leaf/fruit ratio from 33% to 45% in comparison to control vines and improved the soluble solids content (from 0.3 to 1.6 ºBrix). Late-hedging, 5 weeks after bloom, reduced yield and polyphenol content in Sangiovese and, in all cultivars except Sauvignon blanc, the soluble solid content and anthocyanins concentration in both red grapevine cultivars dimished.
The lateral abscission occurred, on the average, two weeks after the fall of primary leaves.
The photoassimilates produced during this time (net photosynthesis ranged from 0.7 to 1.6 μmol CO2 m-2 s-1), are very useful for the reconstitution of the reserve.
For each cultivar, sixty vines on Kober 5BB rootstock, with 30 bud load per vine, were used.
Hedging at the 9–10th node of the main shoots applied precociously, 1 week after bloom, gives good exposure and enhances yield and grape composition.
Cabernet S., Verdello, Drupeggio and Sauvignon blanc showed a good capacity to produce laterals and therefore responded better to early-hedging with increased cluster weight and yield and improved soluble solid, total polyphenol and nitrogen contents.
No effects were observed in Sangiovese that developed few laterals.
Independent of cultivar, with early-hedging, the titratable acidity and pH of the juice were significantly reduced.
In all the cultivars, from flowering to veraison the total leaf area increased more than 3-fold; hedging vines increased lateral growth, and total leaf area was always less than in the control vines (from 15 % to 49 %).The rejuvenation of leaf area following early-hedging and the high photosynthetic activity of the laterals in comparison to primary leaves from veraison to harvest (by 20–40 %) reduced the leaf/fruit ratio from 33% to 45% in comparison to control vines and improved the soluble solids content (from 0.3 to 1.6 ºBrix). Late-hedging, 5 weeks after bloom, reduced yield and polyphenol content in Sangiovese and, in all cultivars except Sauvignon blanc, the soluble solid content and anthocyanins concentration in both red grapevine cultivars dimished.
The lateral abscission occurred, on the average, two weeks after the fall of primary leaves.
The photoassimilates produced during this time (net photosynthesis ranged from 0.7 to 1.6 μmol CO2 m-2 s-1), are very useful for the reconstitution of the reserve.
Publication
Authors
A. Cartechini, A. Palliotti, C. Lungarotti
Keywords
Vitis vinifera, fruit quality, hedging, lateral leaves, photosynthesis, yield
Online Articles (20)