Sensitivity to nitrogen of two rice cultivars with different plant type | 不同株型水稻品种对氮肥的敏感性研究

Chinese. 以穗型直立的紧凑型水稻品种沈农07425和穗型弯曲的松散型水稻品种秋光为试材,在不同施氮水平下,研究粳稻品种地上部对氮肥的敏感性。结果表明:增施氮肥对两水稻品种株高、分蘖数、叶绿素含量(SPAD值)和单株叶面积均起促进作用。沈农07425和秋光株高的施氮增加率为10.81%～25.72%和0.63%～15.69%,分蘖的施氮增加率为46.27%～79.92%和17.39%～54.17%,单株叶面积的施氮增加率为12.71%～278.41%和22.34%～259.82%。除分蘖期CK处理的SPAD值较大外,其他时期沈农07425的SPAD值的施氮增加率为13.29%～101.86%,秋光SPAD值的施氮增加率为9.08%～63.74%。表明地上部性状对氮肥的响应程度品种间差异较大,穗型直立的紧凑型水稻品种沈农07425较为敏感,适于高氮条件下种植。

English. The erect panicle rice cultivar Shennong 07425 and the curved panicle rice cultivar Akihikari were used to study the sensitivity to nitrogen fertilizer under different nitrogen levels.The results showed that increasing application of nitrogen fertilizer enhanced plant height,number of tillers,chlorophyll content(SPAD value) and leaf area per plant within a certain range.The enhanced rate of nitrogen to plant height in Shennong07425 was 10.81%-25.72%,and it was 0.63%-15.69% in Akihikari.The enhanced rate of nitrogen to tillers in Shennong07425 was 46.27%-79.92%,and 17.39%-54.17% in Akihikari.The enhanced rate of nitrogen to leaf area per plant in Shennong07425 attained 12.71%-278.41%,and 22.34%-259.82% in Akihikari.The enhanced rate of nitrogen to SPAD value in Shennong07425 attained 13.29%-101.86%,and it reached 9.08%-63.74% in Akihikari except much higher SPAD value in tillering stage.And there were obvious diffrences on sensitivity to nitrogen between Shennong 07425 and Akihikari.The erect panicle rice Shennong 07425 exhibited greater sensitivity to nitrogen than Akihikari.The erect panicle rice was more suitable for high nitrogen level.