Performance of the cv Pinot noir under pedoclimatic conditions of the Valais area, Switzerland | Comportement du Pinot noir dans les conditions du vignole valaisan
2010
Zufferey, V. | Spring, J.-L. | Verdenal, T. | Viret, O., Station de recherche Agroscope Changins-Waedenswil ACW, Nyon (Switzerland) | Pavrex, C. | Pont, M. | Favre, G.
During 2005, 2006 and 2008, the research station Agroscope Changins-Wädenswil ACW studied physiologic and agronomic behaviour of Pinot noir under several pedoclimatic conditions of the Valais area. Eleven plots were set up with homogeneous material of Pinot noir cultivar, and grapes were vinified with the aim of carrying out chemical and sensory analysis. The three vintages were characterized by low to moderate water constraint and abundant nitrogen nutrition of vines. In the absence of pronounced water restriction, budburst as well as development of shoots mainly depended on temperature according to the altitude of sites. Vines planted in higher water reserve soils showed more important vigour and higher nitrogen content in leaves and must. Anthocyanin content was higher in wines when moderate water restriction occurred during ripening phase of grapes. Sensory analysis on wines confirmed the positive influence of both moderate water constraint and cooler temperatures during grape maturation. Wines issued from vines grown on soils with lower water reserve were preferred thanks to superior tannic intensity and stronger colour. Wines coming from vines grown at higher altitudes were appreciated for their subtle fruity bouquet.
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