QUALITY PARAMETERS OF GRAPES AND WINE FROM DOMESTIC VARIETIES AS INFLUENCED BY TERROIR
Abstract and keywords
Abstract:
The aim of the study is to evaluate the influence of different terroirs on the physiological parameters of leaves, and the quality indicators of berries and wine from the domestic grape varieties Dmitriy, Vladimir and Kurchanskiy. The study was conducted in three different terroirs of various agro-ecological viticultural zones: the Central'naya Zone (CZ), Predgornaya (PZ), and Chernomorskaya (ChZ). The object of the study was technical grape varieties bred by the Federal State Budgetary Scientific Institution SKFNCSVV – Dmitriy, Vladimir and Kurchanskiy. The water content (WC) in grape leaves at all observation periods was highest in the Central'naya Zone – 72.6 % one month before harvest, 71.3 % during harvest, and lowest in the Predgornaya zone – 67.7 % during the first period, 63.3 % during the second period. The response of varieties to different terroir environments has varietal characteristics. The Kurchanskiy and Dmitriy varieties showed a 3.4 and 1.7 % increase in WC, respectively, in the Central'naya Zone. In the Predgornaya and Chernomorskaya zones, all varieties showed a decrease in leaf water content of 0.8–9.3 %. The mass concentration of sugars and titratable acidity varied depending on terroir conditions and varietal characte¬ristics.The Dmitriy variety in the Predgornaya zone had the highest sugar accumulation capacity (22.6 g/100 cm3), while the Kurchanskiy variety in the Chernomorskaya zone had 23.2 g/100 cm3. The Kurchanskiy variety in the Central zone had the lowest sugar content (19.4 g/100 cm3). The Central'naya zone had the lowest titratable acid content. The Dmitriy variety showed the greatest variability in phenolic content. Phenolic content was highest in wine samples from the Predgornaya zone and lower in those from the Central'naya zone. Wine samples from the Predgornaya and Chernomorskaya zones were of higher quality.

Keywords:
grapes, leaf water content, sugar concentration, titratable acids, tasting evaluation, phenolic substances
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