The article presents the results of research on the study of the introduced apple variety Tsivt 11 on dwarf rootstocks M9 and on SK-7, SK-2, selected by the North Caucasus Federal Scientific Center for Horticulture, Viticulture and Winemaking. Based on the research results, biometric parameters of tree growth and development were determined, and the most productive combinations were identified. The height of the trees in the garden, depending on the rootstock, on dwarf rootstocks SK-7 and M9 reached an average of 2.6–2.9 m, on the semi-dwarf SK-2 3.2 m, the diameter of the trunk was 6.6–7.7 cm, respectively, the length of one-year shoots varied from 47 to 63 cm. Productivity is one of the main economic and biological properties of a variety, which reflects not only the degree of realization of the genotype, but also significantly depends on the biological characteristics of the rootstock, its adaptability to the natural and climatic conditions of the cultivation area. It has been established that the variety grafted onto the SK-7 rootstock has a yield that is 15% higher than on the M9 rootstock, and 4.3 times higher than on the semi-dwarf SK-2 rootstock, depending on the planting scheme. According to the structure of fruit formation, the variety is of the ring-type fruiting (70.3–86.3%). The fruits are of medium uniformity, round in shape, harmoniously sweet in taste with a fruit weight of 160–200 g (maximum — 230 g). As a result of studying the periodicity of fruiting, it was found that the highest early fruiting and regularity of the harvest was noted on the rootstock SK7, the periodicity index is 8.4%.
R. A. Shakhmirzoev (Sat,) studied this question.