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EVALUATION OF NEW TART CHERRY CULTIVARS OF POLISH SELECTION
Trees were grafted on Mazzard seedlings and on vegetatively propagated F 12/1. Rootstocks affected tree vigour.
Trees on F 12/1 have grown more vigorously than those grafted on Mazzard seedlings.
Differences in vigour among cultivars and hybrids were independent of rootstock.
In the group of early-ripening cultivars, trees of cultivar ‘Sabina’ were larger than ‘Northstar’ (control) trees.
The trees of the hybrid I-153 were smallest.
Among late-ripening cultivars, ‘Wanda’ trees were the largest.
Among early-ripening cultivars, ‘Sabina’ and ‘Northstar’ had similar yield, but cropping of other early-ripening hybrids was lower than control trees.
Among late-ripening types, the highest-yielding cultivar was ‘Wanda’, which produced twice as much as ‘English Morello’. Rootstock significantly influenced cropping of sour cherry trees.
The yield of ‘Lucyna’ trees was high on F 12/1, but unsatisfactory on Mazzard seedlings.
The index of productivity was highest for ‘English Morello’ and ‘Wanda’, and lowest for the smallest hybrids II-72 and I-178.
Rootstocks did not affect mean fruit weight.
Among the early-ripening varieties, the biggest were fruits of ‘Sabina’ and the hybrid V-8. Among late-ripening cultivars, the hybrid IV-31 bore the biggest fruits and ‘Wanda’ the smallest.