To study the advantages of super late rice combination Fengyuanyou 299 in yield and nitrogen utilization efficiency,a field plot experiment was conducted with two-line hybrid rice combination C Liangyou 4488 and three-line hybrid rice combination Weiyou 46 as control.The results showed that Fengyuanyou 299 had more significant yield superiority.At the same time,nitrogen accumulation,nitrogen use efficiency,nitrogen uptake efficiency,nitrogen harvest index,nitrogen fertilizer efficiency and nitrogen utilization efficiency of Fengyuanyou 299 were significantly higher than those of common hybrid ...