Original research articles

Interaction «training system x vigour» on Merlot. Comparison between vertical trellis and minimal pruning. First results

Abstract

The purpose of this investigation was to compare classical training systems manually pruned, (Vertical Trellis; Open Lyre, Lys, Geneva Double Curtain, Umbrella Kniffin) with a no pruned training system, the Minimal Pruning, in interaction with two vigour situations (high and moderate) mainly dependant on the soil and plant water content. The study focused particularly on Minimal Pruning.

Minimal Pruning on Merlot has increased the yield in both vigour situations while decreasing the berry size but mainly the total cluster number per vine. The berry composition of the (MP) in the two vigour situations is different, mainly for sugar, anthocyanins and acidity. The (MP) wine composition is also distinguished in relation to the vigour. The (MP) wine from moderate vigour is among the most concentrated such as the open Lyre one, but with a component of acidity; the (MP) wine from high vigour situation is far below all wines in terms of quality.

Moderate vigour means a water limitation between –0,4 and –0,6 Mpa since véraison to harvest maturation according to CARBONNEAU (1998) scale of the predawn leaf water potential. The high vigour (MP) wine is less concentrated than the wines from all the tested training systems.

(MP) in moderate vigour situation has a better cluster microclimate than (MP) in high vigour situation, what could also contribute to favorable berries ripening. In addition, for both, the clusters are less compact what is unfavorable to rots. Minimal Pruning in moderate vigour situations could be an attractive economical option for some range of wines as «vins de pays» or «vins de cépage» by reducing pruning expenses and total costs in general, that if vigour can be regularly controlled at a moderate level.

Authors


Alain Deloire

Affiliation : Stellenbosch University, Department of Viticulture and Oenology, Private Bag X1, Matieland 7602, South Africa; NWGIC, Charles Sturt University, Boorooma Street, Wagga Wagga, NSW, Australia, 2650


Alain Carbonneau

Affiliation : Viticulture-OEnologie, Agro de Montpellier, 2 place Viala, Montpellier, France

Carbonne@ensam.inra.fr

François López

Affiliation : Chaire de Viticulture et d'OEnologie, AGRO Montpellier, 2 place P. Viala, 34060 Montpellier cedex, France


Sébastien Suarez

Affiliation : Agro Montpellier, Unité Mixte de Recherche «Sciences pour l’OEnologie», 2 place Viala, 34060 Montpellier cedex 1, France; Université Lujan de Cuyo, Mendoza Argentine


Carmen Pérez

Affiliation : Agro Montpellier, Unité Mixte de Recherche «Sciences pour l’OEnologie», 2 place Viala, 34060 Montpellier cedex 1, France; Université Catholique de Santiago, Chili


Pierre Domergue

Affiliation : Agro Montpellier, Unité Mixte de Recherche «Sciences pour l’OEnologie», 2 place Viala, 34060 Montpellier cedex 1, France


Alain Samson

Affiliation : UE999 Pech-Rouge, INRA, 11430 Gruissan, France

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