Abstract
The article investigates the inheritance patterns of the vegetation period trait in rice (Oryza sativa L.) in F1 and F2 hybrid
generations. The study analyzed hybrids obtained from crosses involving local and foreign varieties, assessing the duration of the vegetation period, degree of dominance (hp), coefficient of variation (CV%), and broad-sense heritability (H²). In the F1 generation, negative, intermediate, and high dominance for vegetation period duration were identified. In the F2 generation, the trait varied within the range of 106–128 days, with wide phenotypic segregation observed. The H² values ranging from 0.77 to 0.98 indicate strong genetic control of the trait. The results confirm that vegetation period duration is a polygenic and complexly inherited trait, providing opportunities for effective selection of early-and medium-maturing forms in breeding programs.