Essai de systèmes de conduite de la vigne pour la production de raisins « pourris nobles » en bordelais

Abstract

<p style="text-align: justify;">Une expérimentation de système de conduite pour la production de vin « liquoreux » en appellation Sainte-Croix-du-Mont, menée de 1979 à 1984 a abouti, dans des conditions de protection à l'hectare analogues et sur la base des analyses des moûts et des dégustations de vins, à classer ainsi par ordre décroissant de potentiel qualitatif (dans une gamme de qualité moyenne à bonne) :</p><ul><li>1) vigne large en lyre ouverte;</li><li>2) vignes larges en lyre fermée (ici de façon assez irrégulière) et en lyre tronquée, vigne étroite rognée;</li><li>3) vigne large plane.</li></ul><p style="text-align: justify;">Il est suggéré un essai à plus grande échelle, notamment de la lyre ouverte et de la lyre tronquée, afin d'assurer le développement de ces nouvelles formes et de mieux étudier le phénomène de surmaturation en présence de pourriture noble.</p><p style="text-align: justify;">+++</p><p style="text-align: justify;">An experiment on training systems for a production of sweet white wine in Sainte-Croix-du-Mont Appellation, from 1979 to 1984, has allowed, for similar yields per hectare and on the basis of must analysis and wine tasting, to classify in a decreasing ranking of quality potential (within a range of quality : medium to good) :</p><ul><li>1) open lyre in wide spacing;</li><li>2) closed lyre (irregularly) and trucaded lyre in wide spacing, classical vertical trellis in close spacing;</li><li>3) classical vertical trellis in wide spacing.</li></ul><p style="text-align: justify;">A wide scale experiment of the open lyre and the truncated lyre is suggested, in order to allow the application of these new forms and to better study the phenomenon of over maturing in presence of noble rot.</p>

Analysis of climate change indices in relation to wine production: A case study in the Douro region (Portugal)

“…Where θ ( • C day) represents the thermic duration or thermic time for a specific phenological stage, T is the daily average temperature and Tb is a threshold above which there is plant development within that phenological stage. Models based on growing degree days (GDD, • C day) have been extensively used to model the phenology of the grapevine [26,27] or as grapevine zoning bioclimatic indices [28][29][30]. A specific phenological squeme partitioning the annual development cycle of the grapevine into three major phases (b -bud burst to flowering, f -flowering to véraison, and v -véraison or berry onset to maturity) has been already proposed for the study area.…”

An overview on botrytized wines

“…Vines with VSP trellis system and wide distance (3.2 m) were the last to be infected. The higher sugar content was detected in open Lyre samples and the lower was found in the sample from the VSP system with wide distance (Carbonneau and Casteran, 1986).…”

“…Tasting results on the aroma perception and intensity of the produced wines showed that the wines obtained from vines trained in open Lyre had the most complex and intense aromatic profile with the aromas of fruits, raisin and honey to be dominant (Carbonneau and Casteran, 1986). VSP samples with wide distances were ranked last in the tasting evaluation, having very a limited aromatic intensity and increased herbal aromas.…”

“…A study conducted over a period of four consecutive vintages on Sainte-Croix-du-Mont, a PDO region in Bordeaux, tried to identify differences between vines trained in two different trellis systems for the production of botrytized grapes and noble rot wines. Vertical shoot position (VSP) and Lyre were under examination, while the differences were based on sugar accumulation and aroma profile on wines (Carbonneau and Casteran, 1986). SP trellis system with 1.6 m vine distance between rows and trunk height at 40 cm, VSP trellis system with 3.2 m vine distance between rows and trunk height at 70 cm, and three types of Lyre training system (open, closed and truncated) with 3.2 m vine distance between rows and trunk height at 70 cm, were examined.…”

“…VSP samples with wide distances were ranked last in the tasting evaluation, having very a limited aromatic intensity and increased herbal aromas. The evaluation order from the best to the worst sample, according to the tasting panel, was: open Lyre, closed Lyre, truncated Lyre, narrow VSP and finally wide VSP (Carbonneau and Casteran, 1986). In total, Lyre system was the training system that produced the most qualitative results.…”