Behaviour of Pinot noir on various rootstocks under chlorotic soil conditions in central Wallis, Switzerland | Comportement du Pinot noir sur differents porte-greffe dans des sols chlorosants du Valais central
2005
Spring, J.-L. (Agroscope RAC Changins, Station federale de recherches agronomiques, Pully (Switzerland). Centre viticole du Caudoz) | Pont, M. | Parvex, C.
Three Pinot noir plots of vines grafted on various rootstocks (5BB, 5C, Fercal, 41B, 161-49, 420A, 110R, 1103P, SO4 and Borner) were planted in highly calcareous soils (60% total lime) in central Wallis, Switzerland, and monitored from 1997 to 2005. In very chlorotic situations, Fercal was the only rootstock that resisted ferric chlorosis satisfactorily. In all three situations, the rootstock Börner grafted vine proved to be too sensitive to chlorosis. In well drained, medium to low chloritic soils, all the grafted vines tested in the present study, except Börner, may be used. There was an initial slow start to development in the grafted vines 41B, 420A and 161-49C, which contributed to a lowering in plant strength. In the productive phase, there was little influence from the grafted vine type on productivity and sugar content in musts. The nitrogen content in musts was influenced by the level of plant strength, which, in turn, is determined by the grafted vine. There was a good correlation between the chlorophyll index of foliage (N-Tester) and visual observations of the intensity of ferric chlorosis.
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