<![CDATA[Oryza sativa is a promising agricultural crop and an important food source for Indonesians. The study aimed to assess the growth of Progenies F1 and its parents, then backcross F1×Inpago 5 to obtain Progenies BC1F1. This study used a randomized block design (RBD) with three groups, each with five replications. Each replication included three plant units for agronomic character observation. Backcross with three replications, each containing 15 plants from each parent F1 (♂) and Inpago 5 (♀). The study's findings revealed that both parents' genetics influenced vegetative growth, specifically plant height and total number of tillers in F1. Inpago 5 (recipient parent) had the highest plant height and the earliest flowering age. Inpara 8 (donor parent) outperforms Inpago 5 and F1 in terms of number of tillers, number of productive tillers, weight of filled grain, number of grains, number of empty grains, weight of empty grains, weight of filled grain, percentage of filled grain and percentage of empty filled grain, weight of 1000 grains, and dry weight of stover. Then, F1 on generative variables had moderate values for the number of filled grains, weight of filled grains, percentage of number of filled grains, number of empty grains, weight of empty grains, percentage of number of empty grains, and harvest age. F1 was determined by the segregation of gene characteristics from its parents. Backcrossing produced 1,448 grains of grain and 1,938 empty grains from a total of 3,386 castrated and pollinated rice flowers. The cross success rate was 42.76%.]]>
