In 2003, the content of citric acid ranged from 23% (Kober 5BB) to 56% (Riparia cl. 1), which was less than in 2002. The grapevines on 196/17 Cl rootstock (0.22 g/l) (P ≤ 0.05) showed a significantly higher content of citric acid than those on Kober 5BB rootstock.