Photosynthetic productivity of leaves of sour cherry and sweet cherry in connection with crown forms

The scientific article presents the results of research work on the study of varietal characteristics of sour cherry and sweet cherry and methods for artificial formation of tree crowns at the level of photosynthetic activity of leaves with the orientation of growing trees by their intensive technology. Zoned cherry varieties Shubinka, Podbelskaya and Shpanka chernaya, sweet cherry Bakhor, Revershon and Drogana jyoltaya grown on a weak vegetatively propagated rootstock BBA-1 and BCL-2 (Krymskiy-5) were used as the object of the study. As a result of the conducted research, it was found that the optimal crown system for varieties of sour cherry and sweet cherry is a five skeletal wall. The formation of the crown in these forms contributes to a decrease in the volume of the crown by an average of 25%, at which the net productivity of leaf photosynthesis in comparison with the usual formation of the crown - freely growing and sparse-tiered shape, reaches 34.73 g/m2 per day. With the formation of bushy crown forms in cherries and sweet cherries, the level of leaf formation improves and the chlorophyll content in the leaves increases to 13.42 mg/g of fresh weight of leaves.