Can nitrogen fertilizer rates affect the yield response of Boro rice (Oryza sativa L.) variety on the Old Brahmaputra floodplain soil of Bangladesh?

Abstract

This study observed the yield response to nitrogenous fertilizer for a popular Boro rice variety BRRI dhan29 under silty loam texture soil with satisfactory organic matter (2.96%). Sequential elevated doses of nitrogen (N0, N70, N80, N90, N100, and N110 kg ha -1 ) along with recommended phosphorus (P), potassium (K), and Sulphur (S) significantly increased grain yield up to 50%. Tested rice variety yielded the highest from N110 kg ha -1 treated plot, 6.30-ton grain ha -1 and 7.57-ton straw ha -1 , which were statistically similar with the 100 kg ha -1 nitrogen application. The N uptake from soil by the plant was also statistically equivalent for N100 and N110 kg ha -1 application. Panicle m -2 , filled grain per panicle, and 1000-grain weight showed the same trends as N uptake and yield. The overall results demonstrate that the application of 100 kg N ha -1 was the best treatment for obtaining higher yield and the N content for both grain and straw of BRRI dhan29 at Old Brahmaputra Floodplain Soil.