Techniques to enhance terroir expression (Terroir 2006)

IVES 9 IVES Conference Series 9 International Terroir Conferences 9 Terroir 2006 9 Category: Techniques to enhance terroir expression (Terroir 2006)
IVES Conference SeriesTechniques to enhance terroir expression (Terroir 2006)Terroir 2006

Incidences of the climate, the soil and the harvest date on Colombard aromatic potential in Gascony

This experiment tries to characterize the role of soil, climate and harvest date on the composition of grape-derivated thiols, 3-mercapto-hexanol (3MH) and 3-mercapto-hexile acetate (A3MH), in the white wines from Colombard varieties in Gascony (South-West of France). A network of 6 plots has been observed since 1999 on different pedologic units. The plots have common agronomical characteristics, plantation spacing (2,900 to 3,500 vines per ha), plantation aging (1985-1990), strength conferred by rootstock (SO4, RSB), soil management (grass covered 1 by 2) and training system (vertical shoot positionning pruned in single Guyot). Meteorological stations are located near the plots.

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IVES Conference SeriesTechniques to enhance terroir expression (Terroir 2006)Terroir 2006

Relation between the environmental factors of the terroir system and flavan-3-ol composition of grape berry seeds and skin at pre-veraison stage and harvest Influence of dedicate viticultural management

Quantity and quality of flavonoïds in grape berries are important parts of their global quality. Several studies had shown that tannins are responsible for some major flavour properties of red wines such as colour, bitterness and astringency. Nevertheless, their synthesis and properties are still misunderstood. Some studies had suggested that the tannic pool was set before veraison. Thus, the comprehension of the relations between environment and setting of this tannic pool, up to the harvest, is not sufficient.

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