COMBINATION ABILITY OF SOYBEAN VARIETIES BY PRODUCTIVITY IN TOPCROSS CROSSES

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