ISHS Acta Horticulturae 206: Symposium on Grapevine Canopy and Vigor Management, XXII IHC
USEFULNESS OF ROOTSTOCKS FOR CONTROLLING VINE VIGOUR AND IMPROVING WINE QUALITY |
| Author: | R. POUGET |
| Abstract:
The vigour induced by the rootstock to the scion depends on the own vigour of the rootstock genotype and on its adaptation to soil conditions together. Experimental results over several years obtained inside two different soils (a calcareous soil of Cognac vineyards and an acid "Graves" soil of Bordeaux vineyards) show that rootstock varieties induce large variations in vigour (pruning weight), in yield and in wine quality (alcohol, polyphenols). If there are no limiting factors under field conditions, there is a significant negative correlation between yield and wine quality when vigour varies either according to the rootstock or according to the vine for the same rootstock. But an optimum of vigour must be found in order to produce the best quality wine : for a rich soil one has to choose a decreasing vigour rootstock and for a poor soil an increasing vigour one. | |
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