Effect of nitrogen levels on yield and yield attributes of rice (Oryza sativa) grown under different planting geometry

A field experiment was conducted during the rainy season (kharif) 2017 at Kumarganj Ayodhya, Uttar Pradesh, to study the effects of nitrogen on rice (Oryza sativa L.) grown under different planting geometry. Four planting geometry, viz. 15 cm x 10 cm, 15 cm x 15 cm, 20 cm x 10 cm and 20 cm x 15 cm and 4 nitrogen levels (0, 60, 120 and 180 kg/ha) were tested in a split-plot design, keeping as main and subplots, respectively, with 3 replications. The crop received a total rainfall of 804.9 mm, while the evaporation was 869.7 mm during the entire crop season. The experimental result revealed that different planting geometry and level of nitrogen had a remarkable influence on the yield-attributing characters and yield of rice. Yield-attributing characters, viz. panicle length, panicles/m², grains/panicle and test weight were increased significantly with the increasing level of nitrogen from 0 to 180 kg/ha. Of the different planting geometry, plant spacing 20 cm x 10 cm resulted in significantly the highest grain yield (5.40 t/ha). The highest grain and straw yields were recorded with the treatment of 20 cm x 10 cm plant spacing and 180 kg N/ha.