[Objective] To study the influence of different nitrogen application amount on the physiological and growth characteristics of Guiliangyou 2. [Method] A randomized block experiment was designed to set up six different nitrogen application amount. The growth dynamics of tiller and the changes of spike production were investigated during the growing season. [Result] Applied with 120 kg/hm2 nitrogen, Guiliangyou 2 had good community structure and high yield, while its community structure was the worst and yield was the lowest when applied with 300 kg/hm2. [Conclusion] The study provided references for the appropriate nitrogen application amount and the high yield of Guiliangyou 2.%[目的]研究不同氮肥施用量对超级稻桂两优2号生理特性和生长发育特点的影响.[方法]采取随机区组试验设计,开展6个相同密度不同氮肥施用量的研究,调查生长期间茎蘖穗的生长动态以及产量变化.[结果] 120 kg/hm2氮肥处理超级稻桂两2号群体结构好,产量最高；300 kg/hm2氮肥处理群体结构差,产量最低.[结论]通过不同氮肥施用量的研究,为超级稻桂两2号及同类超级稻提供适宜氮肥施用量的参考.
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