Effects of different cultured density on yield and nitrogen utilization efficiency of Boyou225

'Boyou225'was used as material to study the effects different of cultured density on yield and nitrogen utilization of late rice.The main conclusions were showed that effects of different cultured density on yield was significant.The mainly due to increase of effective panicles,grain number per panicle,ripening rate,leaf area index,leaf area per stem,between the canopy light intensity,dry matter accumulation and coordination of relation of sink-source.Effect of yield increase was best under condition of combination of cultured density 0.2 m×0.3 m and 180 kg/hm2 of nitrogen application and the yield was 8.682 t/hm2.Effect of different cultured density on nitrogen utilization efficiency was significant.Nitrogen efficiency and nitrogen utilization efficiency were highest among 150 kg/hm2 of nitrogen application under 0.2 m×0.3 m and 180 kg/hm2 of cultured density,which was 48.23 kg/kg,53.85 kg/kg.Therefore,properly cultured density was advantageous to improve sink-source relationship and heighten yield,nitrogen efficiency and nitrogen utilization efficiency of late rice.