From the perspective of contribution of exported matter from culm , sheath and leaf to spikelets , leaf brade ranked the first with its exported N element accounting for 21 % ￣ 33 % of the total accumulated matter .
从茎、鞘、叶三个器官的输出物质对子粒的贡献程度来看，叶片的贡献程度最大，其输出的氮素量占子粒积累总量的21%～33%；
brade