Abstract
Abstract: The objective of this work was to compare the effect of the Y-trellis and vertical shoot position trellis (VSP) training systems on the physicochemical composition and aromatic profile of 'Sauvignon Blanc' (Vitis vinifera) wines in a high-altitude region of the state of Santa Catarina, Southern Brazil. The experiment was conducted during the 2015 vintage in a commercial vineyard located in the municipality of São Joaquim. The treatments consisted of the training systems: Y-trellis and VSP pruned in spur cordon. Sixty kilograms of grapes were harvested from each training system to make the wines, which were evaluated as to their chemical and phenolic composition and aromatic profile. There is no effect of the training system on the wine chemical variables pH, total acidity, color, and total polyphenols. The aromatic profile and phenolic composition of the wines are affected by the training systems, being related to the variables ethyl acetate, isoamyl acetate, 3-methyl-1-butanol, propanoic acid, and gallic acid in the Y-trellis, and to 1-hexanol, isovaleric acid, caprylic acid, capric acid, and catechin in VSP. The Y-trellis system can be an alternative for high-altitude regions of Southern Brazil.
Highlights
The high-altitude regions of the state of Santa Catarina, Brazil, are characterized by having vineyards between 900 and 1,400 m above sea level, with longer phenological cycles, as well as a greater solar radiation availability and thermal amplitude than the other wine-growing regions of the country (Brighenti et al, 2013)
In high-altitude regions, grapevine production is based on the vertical shoot position trellis (VSP), and vines are pruned in spur cordon (Vianna et al, 2016)
The objective of this work was to compare the effect of the Y-trellis and VSP training systems on the physicochemical composition and aromatic profile of 'Sauvignon Blanc' wines in a high-altitude region of the state of Santa Catarina, Southern Brazil
Summary
The high-altitude regions of the state of Santa Catarina, Brazil, are characterized by having vineyards between 900 and 1,400 m above sea level, with longer phenological cycles, as well as a greater solar radiation availability and thermal amplitude than the other wine-growing regions of the country (Brighenti et al, 2013). In high-altitude regions, grapevine production is based on the vertical shoot position trellis (VSP), and vines are pruned in spur cordon (Vianna et al, 2016). These features, combined with high concentrations of organic matter in the soil (Zalamena et al, 2013) and with the choice of vigorous rootstocks, results in an excessive vegetative growth in the vineyards. To overcome the problem of excessive vigor, changing canopy shape can be an alternative to achieve a balance between vegetative growth and grape production This can be done through canopy division, which simultaneously increases production and can improve grape composition (Würz et al, 2019). This training system, despite having a higher initial implantation cost than VSP, has the advantage of increasing production without loss of grape quality, besides facilitating the installation of protected cultivation, such as plastic cover or antihail nets (Pedro Júnior et al, 2015; Marcon Filho et al, 2017)
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