Variabilità di alcune fasi fenologiche della vite in rapporto a fattori genetici e ambientali

Phenological tests were carried out on four vine cultivars (Vermentino, Cannonau, Nuragus and Vernaccia) each grafted on to four rootstocks (1103 P, 779 P, semenzali di Palermo, 420 A). In the research carried out between 1985 and 1988, the type of rootstock did not appear to influence the phenology, but the results were significant1y different for the four vine cultivars. The results also varied significant1y from one year to another during the trial period due to meteorological variations. Various bioclimatic indices were applied to the data, and the Amerine-Winkler index was the one which corresponded most closely.