Growth and Yield of Rice as Influenced by Seed Rates and Genotypes under Aerobic Condition

The grain yield of aerobic rice is greatly influenced by plant population and the farmers are getting low yield in aerobic situation. Hence, field experiments were conducted at the experimental block of National Rice Research Program, Hardinath, Dhanusha during 2015-16 aiming to find the optimum seed rates and suitable genotypes for higher grain of rice under aerobic conditions. The experiments were laid out in split plot design with three replications in both years. Three rice genotypes, IR833383, HUA565 and NR2157-122-1-2, were allocated to main plots and five levels of seed rates (20, 30, 40, 50 and 60 kg/ha) as sub plots. The statistical analysis showed that the seed rate influenced grain yield and yield attributing characters significantly and grain yield of more than 3.0 t/ha was recorded in seed rates of 40 kg/ha. The variety and seed rate interaction was found non-significant for grain yield and its contributing parameters. This study showed that the seed rate of 40 kg/ha was promising for high grain yield under aerobic condition.