Optimization Nitrogen Fertilizer Application for a New Mutant Rice Variety var. Sin Shwe Se by Using Isotopic 15N Tracer

Major challenge in rice production is to achieve the goal of enhancing both yield and fertilizer use efficiency. A new mutant rice variety var. Sin Shwe Se was used in the present study to monitor the efficiency and effectiveness of the N-fertilization technique under irrigation and different nitrogen fertilization rates, 60kg N/ha, 80kh N/ha and 100kg N/ha with split application (at 10 days after transplanting, active tillering stage and panicle initiation stage). An experiment was conducted as split plot based on randomized complete block design with three replications at the Research Farm of Biotechnology Research Department (BRD, Kyauk-Se) during 2015 summer and rainy cropping season. 15N labeled urea fertilizer with 5.21%a.e was applied to micro-plot (1 m2) and 14N urea to sampling plot. According to the experimental result,80 kgN/ha lead the highest grain yield (%), nitrogen harvest index NHI(%), physiological N-used efficiency PNUE, fertilizer N-uptake and fertilizer N used efficiency FNUE in 2015 summer cultivated season and dry matter yield (t/ha), grain yield (t/ha), plant N-uptake (kg/ha), Nitrogen derive from fertilizer NDFF (kg/ha), N recovery (%) in 2015 rainy cultivated season