Productivity of hybrid rice (Oryza sativa L.) as affected by nitrogen levels and plant geometry under transplanted situation in eastern Uttar Pradesh

Field experiments were conducted at the research farm of the Narendra Deva University of Agricultural and Technology, Kumarganj, Faizabad, Uttar Pradesh, during rainy (kharif) seasons, to find out the optimum dose of nitrogen and suitable plant geometry for hybrid rice (Oryza sativa L.) under transplanted situation. Increasing levels of nitrogen significantly increased plant height, tillers, dry matter accumulation, panicles, panicle weight, spikelets/panicle, grains/panicle, grain and straw yields, nitrogen content in grain and straw (%) and nitrogen uptake upto 200 kg/ha. Hybrid rice recorded good response to nitrogen upto 184.9 kg/ ha. Based on the nitrogen use efficiency and benefit: cost ratio application 200 kg nitrogen/ha was found to be superior to the other treatments. Closer plant geometry of 15 × 10 cm proved to be significantly higher plant height, tillers, dry matter accumulation, panicles, spikelets/panicle, grains/panicle, grain and straw yields, nitrogen content in grain over wider plant geometry of 20 × 15, 15 × 15 and 20 × 10 cm. However, the treatment combination of 200 kg N/ha with planting spacing of 15 × 10 cm was found economically feasible agronomic practice for rice hybrid PHB 71.