Effects of different nitrogen fertilizer rates on population structure, grain yield and nitrogen use efficiency of Liangfengyou 339

【Objective】The effects of different nitrogen levels on population structure,grain yield and nitrogen use efficiency of Liangfengyou 339 were studied to provide references for cultivation regulation and population control of the hybrid rice variety Liangfengyou 339. 【Method】A randomized block was designed and six different nitrogen fertilizer treatments(0,90,135,180,225,270 kg/ha) were set to investigate tiller dynamics,yield and its structure factors, and nitrogen utilization of Liangfengyou 339. 【Result】The tiller dynamics control were reasonable under 90 and 135 kg/ha with nitrogen partial factor productivity(NPFP),nitrogen agronomy efficiency(NAE),nitrogen physiological efficiency(NPE)and nitrogen absorption efficiency(NAE) at a higher level. At the lower nitrogen levels,the number of grains per panicle increased with increasing nitrogen levels. At higher nitrogen levels,grain weight and seed setting rates decreased with increasing nitrogen levels. 【Conclusion】Under low nitrogen conditions, Liangfengyou 339 could get good population structure, yield and high nitrogen use efficiency. N application 90-135 kg/ha was optimum fertilization application.