0000000000394282
AUTHOR
Jean Philippe Roby
Les terroirs viticoles : une méthodologie de zonage en fonction du sol
Terroir is a key-concept in viticulture that is more and more widely recognized to explain variations in wine quality and wine style. Terroir refers to an area and thus possesses a geographical dimension. Hence, zoning of viticultural terroir is necessary. This paper addresses soil related aspects of terroir zoning. The first step of the zoning process is a clear identification of the objectives that are being pursued: demarcation of production areas, the adaptation of the viticultural management practices to variations in soil types or the protection of viticultural landscapes. The second step is the definition of a scale adapted to the objectives. The precision of the zoning increases wit…
Hierarchy of factors impacting grape berry mass: separation of direct and indirect effects on major berry metabolites
Final berry mass, a major quality factor in wine production, is determined by the integrated effect of biotic and abiotic factors that can also influence berry composition. Under field conditions, interactions between these factors complicate study of the variability of berry mass and composition. Depending on the observation scale, the hierarchy of the impact degree of these factors can vary. The present work examines the simultaneous effects of the major factors influencing berry mass and composition to create a hierarchy by impact degree. A second objective was to separate the possible direct effects of factors on berry composition from an indirect effect mediated through their impact on…
Changements climatiques. Quelles conséquences pour la production viti-vinicole en bordelais ?
National audience
Impact of vine water status on berry mass and berry tissue development of Cabernet franc (Vitis vinifera L.), assessed at berry level
Background Berry size is considered an important quality factor in red wine production. The objective of this work was to study the effect of vine water status on berry mass in field conditions, with a specific focus on berry tissue masses. Results The study was carried out over 2 years in a plot located in Sicily (Italy). Two irrigation treatments were established. Dynamic evolution of berry mass and berry tissue masses at harvest were recorded. Berries produced under water deficit conditions were smaller and characterized by a higher skin-to-flesh ratio. However, this ratio did not change when berry mass varied independently from vine water status, showing coordinated growth of flesh and …
Les modifications de l’expression du terroir induites par le changement climatique nécessitent une adaptation du matériel végétal et des techniques viticoles
National audience; Le terroir est un écosystème dans lequel la vigne est en interaction avec son environnement naturel, et en particulier avec le sol et le climat. Le climat influence le comportement de la vigne par les températures (effet sur la précocité du cycle), le rayonnement solaire (qui fournit l'énergie à la photosynthèse et joue sur l'Evapo- Transpiration Potentielle) et les précipitations. La production de grands vins qui expriment fortement l'identité de leur terroir est liée à une juste association cépage―climat. La précocité du cépage doit être en adéquation avec les conditions climatiques locales pour que les raisins ne mûrissent ni trop tard (ce qui aboutirait à la productio…