Effect of Nitrogen Levels on the Yield Performance of Aromatic Rice Varieties

Abstract

A field experiment was conducted to evaluate the effect of different nitrogen levels on the yield performance of three aromatic rice varieties in transplanted aman (monsoon) season. The rice varieties included are Morichshile, Kachra and Raniselute and five nitrogen levels 0, 30, 60, 90 and 120 kg N ha⁻¹ formed the treatment variables. The experiment was laid out in a Factorial Randomized Complete Block Design (RCBD) with three replications. All the yield contributing characters differed significantly due to variety. Morichsail produced the maximum number of grains per panicle (76.35). Among the varieties, Morichsail gave the maximum grain yield (2.69 t ha⁻¹). Different nitrogen rates also significantly affected the aromatic rice varieties. Plant height, total tiller, unfilled grain panicle⁻¹ and biological yield increased with the nitrogen application. Panicle length, effective tillers panicle⁻¹, 1000-grain weight, grain yield and harvest index were significantly increased up to 60 kg N ha⁻¹ and thereafter decreased. The combination of varieties and nitrogen rates significantly affected panicle length, filled grain panicle⁻¹ and grain yield of aromatic rice. It was observed that interaction of the variety Morichsail and 60 kg N ha⁻¹ gave the highest panicle length, filled grain panicle⁻¹ and grain yield. Suggested Subject Keywords: Aromatic rice; Nitrogen levels; Yield performance; Morichshile; Kachra; Raniselute; Transplanted aman season; Factorial RCBD; Grain yield; Yield-contributing characteristics.