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Petioles were gathered at three times during the season: bloom, veraison, and harvest, in two trials `Chardonnay' (Ch) and `Cabernet Sauvignon' (CS). In each trial, scions were grafted onto 14 rootstocks. Petioles were analyzed for NO 3 -nitrogen, %N, and %K. Averaged over rootstocks, CH petiole NO 3  levels were highest at harvest and lower at both bloom and veraison. A similar trend was seen in `Cabernet Sauvignon', although, on average, NO 3  levels were higher on all sampling dates. In Ch, the rootstocks `Ramsey', `St George', and `110R' were among the highest in NO 3 , while Harmony and 1616C were among the lowest. In CS, O39-16 was among the highest in NO 3 , while 44-53M was among the lowest. In both cultivars and among all rootstocks, petiole NO 3  was positively correlated with petiole %N in Ch, petiole K declined throughout the year, while in CS most rootstocks were relatively stable. In Ch, the rootstocks `Harmony', `1616C', and `44-53M' had high levels of K, while in CS `44-53M' was among the highest.

Influence of Rootstock on Seasonal Levels of N and K in Petioles of Two Grape Cultivars