Dimitar Sotirov and Stanislava Dimitrova
Institute of Agriculture, Kyustendil 2500, Bulgaria
Sotirov, D. & Dimitrova, S. (2022). Influence of some rootstocks and interstocks on the growth and fruiting of cherry cultivar Summit. Bulg. J. Agric. Sci., 28 (3), 413–416
During the period 2018-2020, the influence of Gisela 5, Gisela 6, Weiroot 10 and F12 / 1 rootstocks was studied, including when they are used as interstocks (with a length of about 30 cm) on the manifestations of the sweet cherry cultivar Summit. Trees of the same cultivar grafted directly on seedlings of IK-M9 (a local mahaleb rootstock) were used as a control. The trees were planted in the spring of 2008 at distances of 4.0 x 3.0 m, were formed in free-growing crowns and during the study period were grown without irrigation. It was found that at the end of the 13th year the trees grafted on F12/1, used as rootstock, had the thickest stems, and those of Gisela 5 and Gisela 6 the thinnest, and the differences with the control were proven. However, no significant differences were found in the cross-section of the trunk of the trees with interstocks and control trees. The highest cumulative yield was obtained from the trees directly grafted on F12/1 and IK-M9, and all other combinations have proven lower yields. Trees with Gisela 5, Gisela 6 and Weiroot 10 as interstocks were more productive compared to the variants in which they were used as rootstocks. In terms of cumulative yield efficiency, the trees on IK-M9 significantly surpassed all other combinations. No significant differences in fruit biometric parameters were found between the studied variants.