Abstract: Under the same nitrogen application rate and fertilization mode, the yield of Liangyou 6326 was decreased with sowing time delayed. However, with the same sowing date, the yield of Liangyou 6326 was increased with nitrogen application rate raised. Compared to the sowing date, the effects of nitrogen application rate on yield of Liangyou 6326 was greater. The results showed that the suitable nitrogen application rate was 225.0~262.5 kg/hm2（pure nitrogen） and the suitable sowing date was from May 15 to May 20.

Key words: rice, Liangyou 6326, nitrogen fertilizer application rate, sowing date, grain yield

摘要： 在氮肥施用量及方法相同情况下，两优6326产量随着播种时间的推迟而降低；在相同播期条件下，两优6326产量随着氮肥用量的增加而提高，结实率则随氮肥用量的增加而下降。播种时间的迟早比氮肥施用量多少对两优6326产量的影响程度更大。试验结果表明，两优6326在生产上以纯氮施用量225.0~262.5 kg/hm2、5月15-20日播种为宜。

关键词: 水稻, 两优6326, 氮肥施用量, 播种期, 产量