Abstract
Thirteen grapevine rootstocks grafted to Vitis vinifera L. `Chardonnay' clone 4 were compared over 5 years of fruiting in a replicated trial. The scion and all rootstocks were certified as virus tested and true-to-type. Green-growing bench grafted vines were planted in 1989 and vine growth and yield component data collected in 1993–1997. Planting density was 2.44 × 3.66 m vine by row (1122 vines/ha). All vines were harvested on one date each year. Analyses conducted on the 5-year averages of most parameters indicated the year by treatment (rootstock) interaction was significant (P < 0.05). Within years, rootstock response was significantly different for most parameters. In the last 3 years (1995 to 1997), AXR#1 and 5C were among the highest-yielding stocks, ranging from 15.2 to 26.8 kg/vine and 13.8 to 26.1 kg/vine, respectively. Among the lower-yielding stocks during the same period was 101-14, which ranged from 11.6 to 22.9 kg/vine. Other low-yielding rootstocks included 110R and 779P. Vine yield was not highly correlated with either cluster number or cluster weight in any year; however, AXR#1 consistently produced among the highest number of clusters per vine. 5C had the greatest pruning weights in 1994 and 1995 (3.2 and 3.1 kg/vine, respectively) and 1045P had the highest in 1996 (2.4 kg/vine). 1045P also had the greatest shoot weights in each of the last 3 years for which pruning weights are available (1994–96). In 1994 and 1995, 101-14 had among the lowest shoot weights and shoot numbers per vine.
Published Version
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