Estimation of several plum cultivars on four rootstocks.

The experiment was conducted at Fruit Experimental Station near Wrocław in 1995-2004. The testing material included one-year-old maidens of four new plum cultivars on seedlings Wangenheim Prune, Pixy, GF 655/2 and St. Julien A. Rootstocks were planted at a spacing of 4 x 2 m (1250 trees per ha) in the spring of 1995. Up to the tenth year after planting, growth, yield, fruit quality and survival were affected by cultivar and rootstock. Cultivars ‘Čačanska Rana’, ‘Empress’ and ‘Oneida’ were the most productive on rootstock GF 655/2. Total yields per tree from 1996 to 2004 were the highest with trees ‘Čačanska Najbolja’ on St. Julien A. Seedlings Pixy and especially Wangenheim Prune reduced vegetative growth of plum cultivars in comparison to rootstocks GF 655/2 and St. Julien A. Type of rootstock had no influence on mean fruit weight of cultivars ‘Empress’ and ‘Oneida’. Bigger fruit were picked from trees ‘Čačanska Rana’ and ‘Čačanska Najbolja’ budded on more vigorous rootstocks GF 655/2 and St. Julien A. Significantly the most root suckers were observed on rootstock GF 655/2.