Optimization of Nitrogen Dose for Yield Maximization of BRRIdhan49
An experiment was conducted during Transplant Aman season to determine the optimum dose of nitrogen on growth and yield of BRRI dhan49. The experiment was laid out following the Randomized Complete Block Design (RCBD). There were seven treatments with three replications. All yield contributing characters like plant height, effective tillers hill-1, panicle length, filled grains panicle-1, grain yield and straw yield except 1000 grains weight of BRRI dhan49 significantly responded to different levels of applied nitrogen and varied from 81.50 to 89.55 cm, 7 to 11, 20.67 to 22.44cm, 104 to 142, 3.75 to 6.17 t ha-1 and 4.52 to 7.50 t ha-1, respectively. The highest grain yield of 6.17 t ha-1 was recorded in the treatment T7 (90 kg nitrogen ha-1). The highest straw yield of 7.50 t ha-1 was also noted in the treatment T7 (90 kg nitrogen ha-1). The grain and straw yield due to the different treatments increased by 20 to 64.53% and 21.02 to 65.93% respectively over control. The nitrogen content and uptake by grain and straw were significantly influenced by the application of different levels of nitrogen. The results indicated that the use of 90 kg nitrogen ha-1 had better performance on the grain and straw yields. Therefore, the application of 90 kg nitrogen ha-1 for BRRI dhan49 cultivation is the best for higher yield at Old Brahmaputra Floodplain soil.
Optimization, Nitrogen, Uptake, Yield, BRRI Dhan49 (Oryza Sativa L.)
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