The influence of plant density and hedgerow height on grape and wine quality. Trial on Chasselas vines in Leytron (Wallis, CH) | Influence de la densite de plantation et de la hauteur de la haie foliaire sur la qualite des raisins et des vins. Essai sur Chasselas a Leytron (VS)
2006
Murisier, F. | Zufferey, V. (Station de recherche Agroscope Changins-Waedenswil ACW, Pully (Switzerland). Centre viticole du Caudoz)
A study on plant density was carried out in 1994, using Chasselas vines on the experimental estate of the Agroscope Changins-Wädenswil Research Station ACW in Leytron (Wallis, Switzerland). Variations in plant density were obtained by adjusting distances between rows and plants and heights of hedges. At comparative yields per unit surface area and same hedgerow heights, the sugar concentration in musts tended to decrease with increasing distances between rows. The ratio of exposed leaf surface per kg of grapes (SFE/kg) was a valuable tool in explaining sugar content in musts. Maximum levels of sugar were reached when the SFE/kg was above 1.0 to 1.2 m2. No significant effects of plant density were noted on the weight of berries, bud fertility or on the components of must and wine acidity. Raising distances that separate the rows caused a slight increase of shoot weight but a sharp drop in pruned wood weights per unit of soil surface. It also reduced potassium levels in leaves and the content of glycerol and superior alcohols in wines. From the wine-tasting point of view, at satisfactory SFE/kg ratios, widening interrow spacing tended to improve wine quality slightly.
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