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The influence of two rootstocks (Prunus cerasifera Ehrh. and Prunus tomentosa Thunb.) on growth, yield and fruit quality of five plum cultivars: 'Herman', 'Opal', 'Cacanska Rana', 'Cacanska Lepotica' and 'Dąbrowicka Prune' was estimated. Seven years after planting, the trees of all the considered cultivars grew more vigorously on P. cerasifera rootstock than the trees on P. tomentosa. The highest yields were har­vested from the trees 'Cacanska Lepotica' grafted on P. cerasifera. Productivity of all the cultivars of plum trees on P. tomentosa rootstock was higher than of these grafted on P. cerasifera seedling. The considered rootstocks had no influence on fruit weight of the investigated plum cultivars. 'Cacanska Rana' trees produced the biggest fruit, whereas the smallest were harvested from 'Dąbrowicka Prune' trees.
In this experiment, early ripening plum trees were pruned at two different times. The experiment was conducted at the Fruit Experimental Station in Samotwór near Wroc ław in 2001-2004. Objects of the study were 8 year-old plum trees of 'Herman', 'Cacanska Rana', 'Sanctus Hubertus' and 'Cacanska Lepotica' cultivars budded on 'Myrobalan' seedlings (Prunus divaricata). The experiment was established in a randomised block design in three replications with 6 trees per plot. In 2001-2003, time of tree pruning was differentiated. Half of the trees were pruned only at the end of August (summer pruning after harvest of fruit). The other pruning took place at the end of March (dormant pruning before blooming time). Time of pruning had no influence on vegetative growth and chemical composi­tion of leaves. No matter what the time of pruning, the total sugars, reducing sugars, potassium, calcium, magnesium and phosphorus contents in leaves were similar. Sugars, calcium and phosphorus contents were significantly influenced by the year. Foliar nutrient content differed according to the plum cultivar. 'Sanctus Hubertus' showed markedly lower leaf K and Mg contents, whereas 'Cacanska Lepotica' had a higher P content. Pruning time had an influence on the crop efficiency index. Dor­mant-pruned trees were significantly more productive.
The aim of the study was to present and compare characteristics of pomological parameters, colour, dry matter and solids contents, as well as antioxidant activity of fruit of selected plum cultivars. Analyses were conducted on plums (Prunus domestica) of three cultivars: ‘Wegierka Zwykła’, ‘Bluefre’ and ‘Elena’. Presented morphological parameters of fruit and stones included their length, width and weight, as well as mean fruit size and firmness. Fruit colour was measured by spectrophotometry in the L*a*b* system. Contents of dry matter and solids were determined in fruits. Moreover, Trolox-equivalent antioxidant capacity (TEAC) of plums was assayed by colorimetry using a cation radical ABTS. The biggest fruits were found for cv. ‘Bluefre’, while the highest value of dry matter and solids contents – in cv. ‘Wegierka Zwykła’. Higher antioxidant activity (μM Trolox/g d.m.) was assayed in plums of relatively new cultivars, ‘Bluefre’ and ‘Elena’, in comparison to the traditional cultivar ‘Wegierka Zwykła’.
The experiment was established at the Fruit Experimental Station Samotwór near Wrocław in 1993–2002. The aim of this study was to estimate the production value of 22 plum cultivars grafted on ‘Myrobalan’ seedlings (Prunus divaricata). Results of the study proved that ‘Čačanska Najbolja’ and ‘Magna Glauca’ cultivars were the most vigorous, while ‘Bluefre’ and ‘Auerbacher’ were characterised by the weakest growth. ‘Bluefre’, ’President’, ‘Ontario’ and ‘Auerbacher’ cvs. were the most productive. Mean fruit weight was significantly dependent on the cultivar, too. Among the tested cultivar, the biggest fruit was obtained from ‘President’, ‘Valor’, ‘Bluefre’ and ‘Ontario’ trees. The most sensitive to plum pox virus (symptoms on fruit and leaves) appeared ‘Węgierka Zwykła’, ’Węgierka Zimmera’, ‘Ortenauer’ and ‘Magna Glauca’.
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