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The experiment was conducted in the Experimental Station in Baranowo near Poznań between 2007-2009. The influence of mycorrhizal fungi on the growth and yield of the plum tree cultivar - ' Cacanska Lepotica' and sour cherry tree cultivar - 'Schattenmorelle' was estimated. Three years after planting, the plum trees had bigger vigour of growth, expressed by TCSA, in a combination with mycorrhizal fungi. Sour cherry trees did not differ in growth after the use of mycorrhizal fungi. A higher yield of fruits was harvested from plum and sour cherry trees inoculated with a mycorrhizal fungi. Productivity of mycorrhized trees, calculated according to the cross-sectional area of the trunk, was higher than in the control. The use of mycorrhizal fungi had no influence on fruit mass of the investigated species of fruit trees.
Sour cherry trees cultivars Debreceni Botermo, Nefris, English Morello and local Sokówka Serocka were densely planted at4x1.4x1.5 and 4 x 2 m, and the leader trained for mechanical harvesting with a self-propelled straddle harvester working in continuous motion. From the 3rd year onward the trees were renewal-pruned. Branches older than 3 years were cut back and replaced by young wood. All the culti­vars were suitable for mechanical harvesting, although the trees of 'English Morello' were the most difficult to train because of weak growth and trailing shape. Growth measurements over six years indicated that the optimal planting density for 'English Morello' trees was 4 x 1.5 m, and for the other cultivars 4x2m. The harvester designed at the Institute of Horticulture, Skierniewice, was operated by 4 people and appeared to be able to harvest fruit with 95% effectiveness, delivering about 2000 kg of fruit per hour. Fruit quality was good for industrial processing, but not as good as that of hand-picked cherries suitable for freezing.
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