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L'alimentation potassique et la qualite du Chasselas de table ont ete etudiees au cours d'enquetes realisees en annees seches dans le vignoble de Moissac, sur les parcelles en production. Les teneurs foliaires en potassium sont correlees significativement a la qualite (teneur en sucres, aspect) de ce raisin de table. Les faibles niveaux des teneurs foliaires en potassium a la veraison, dans le vignoble, sont expliques par une fertilisation trop superficielle et par certaines situations pedologiques defavorables a l'alimentation potassique. L'effet de l'irrigation est envisage dans ce contexte. +++ Leaf concentrations of N, P, K, Ca, Mg, as well as soil characteristics and quality data of Chasselas table grapes grown in farmers vineyards in the Moissac area were studied during dry years. K concentrations in leaves, being rather low were significantly correlated with the sugar concentration in grapes and with their aspect. The range of higher K/Mg ratio in leaves was correlated with the level of exchangeable K in the subsoil (40-60 cm). Superficial potassium application and type of soils were the main causes for K deficiency observed on the vine plants. Potassium availability in these soils (brown earth and calcareaous soils differing in CaCO 3 content).

Alimentation potassique et qualité du chasselas de table