Agriculture and forestry

Mazur Oleksandr Vasyliovych – Candidate of Agricultural Sciences, Associate Professor of the Department of Plant Production, Selection and Bioenergetic Cultures, Vinnytsia National Agrarian University (21008, Vinnytsia, Soniachna Str., 3 е-mail: selection@vsau.vin.ua).

Mazur Olena Vasylivna – Candidate of Agricultural Sciences, Senior Lecturer of the Department of botany, genetics and plant protection, Vinnytsia National Agrarian University (21008, Vinnytsia, Soniachna Str. 3).

Two-tester analysis of topcross crossings of soybean varieties, which differ in valuable economic traits and ecological and geographical origin, was used in the research. According to the indicators of combining ability, the value of soybean varieties was determined by the elements of the crop structure. In hybrid populations, the degree and frequency of positive transgressions have been determined, which is a selection material for the creation of new varieties by hybridization. High effects of ZKZ on plant height and attachment of lower beans were established in Sawyer 2-95 variety and KiVin tester; by the number of productive nodes - in the varieties Sawyer 2-95, Medea, Kyivska 97 and tester KyVin; according to the number of beans per plant - in varieties Ustya, Kyivska 97 and tester KyVin; according to the number of seeds on the plant - in the Medea, Kyivska 97 and Hoverla tester varieties; by the weight of 1000 seeds - in varieties Sawyer 2-95, Kyivska 97 and Hoverla tester; according to the mass of grain from the plant - in the varieties Medea, Kyivska 97 and tester Hoverla; in terms of productivity - in Medea, Kyivska 97 and tester Hoverla varieties. It was established that additive effects of genes were dominant in the genetic control of plant height traits and attachment of lower beans, elements of crop structure and productivity, but there was also a significant non-additive effect. According to the number of beans per plant, the number of seeds per plant, and the weight of seeds per plant, in the   vast   majority  of   hybrid   populations,  inheritance  by  the  type  of  overdominance  and  dominance of the parental form with a higher manifestation of the trait was noted. The analysis of dominance indicators made it possible to identify crossbreeding combinations that are distinguished by the overdominance of the specified traits and have significant breeding value: Sawyer 2-95 × Hoverla, Kyivska 97 × Hoverla, Kharkivska precocious × Hoverla, Sawyer 2-95 × KiVin, Kharkivska precocious × KiVin.

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