3个烟后晚稻品种产量性状与养分利用及对氮肥的响应

为给宁乡烟区烟后晚稻品种选择提供依据,通过大田试验,研究了3个晚稻品种（湘丰优103、深优9586、五丰优T025）产量性状与养分利用及对氮肥的响应差异。结果表明：（1）不施氮条件下,五丰优T025产量最高,湘丰优103产量最低;施氮使湘丰优103增产17.9%,五丰优T025增产9.3%,深优9586增产3.4%。（2）3个品种的氮素积累总量均因施氮而显著提高,湘丰优103提高39.1%,五丰优T025提高30.4%,深优9586提高12.3%。（3）施氮促进水稻对磷、钾的吸收与累积,湘丰优103反应最敏感,其次是五丰优T025。（4）3个品种在氮素利用上存在显著差异,湘丰优103的氮农学利用率（AEN）与氮肥吸收利用率（REN）均表现最好。综合产量与养分利用情况,不施氮条件下,宁乡烟区烟后晚稻品种宜选五丰优T025和深优9586,而施氮（90kg/hm2）条件下宜首选湘丰优103,其次是五丰优T025。

Effect of Nitrogen Fertilizer on Yield Characters and Nutrients Utilization of Three Late Rice Varieties

To provide reference to late rice varieties selection in Ningxiang tobacco areas, a field experiment was conduc- ted to study the effect of nitrogen fertilizer on yield characters and nutrients utilization of three late rice varieties, Xiang- fengyou 103, Shenyou 9586 and Wufengyou T025. The results showed that： （ 1 ）The yield of the three varieties showed the trend of Wufengyou T025 〉 Shenyou 9586 〉 Xiangfengyou 103, and yield of Xiangfengyou 103, Wufengyou T025 and She- nyou 9586 was increased by 17. 9%, 9. 3 % and 3.4% respectively after nitrogen application. （2） Nitrogen accumulation of the three varieties was increased significantly after nitrogen application, and the increase trend of Xiangfengyou 103, Wufengyou T025 and Shenyou 9586 was 39. 1%, 30. 4% and 12. 3% , respectively. （3） Nitrogen application promoted the absorption and accumulation of P and K of the three varieties, and the most sensitive variety was Xiangfengyou 103, and the next was Wufengyou T025. （4） Significant difference in nitrogen utilization existed among varieties, and the AEN and REN showed the trend of Xiangfengyou 103 〉 Wufengyou T025 〉 Shenyou 9586. Considering the yield and nutrients u- tilization, Wufengyou T025 and Shenyou 9586 were the ideal late rice varieties in Ningxiang tobacco area under no - ferti- lization condition, while under N 90 kg/hm2 condition, the optimal variety was Xiangfengyou 103, and the next was Wufengyou T025.