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在盆栽条件下 ,研究 1 9个常规籼稻和 1 6个杂交籼稻代表性品种 (组合 )的氮素利用效率的差异。结果表明 :1常规籼稻与杂交籼稻氮的干物质生产效率 (NUEp)及籽粒生产效率 (NUEg)在品种 (组合 )间的变化幅度均较大 ,两者的变异系数均较大 ,但杂交籼稻的变化幅度低于常规籼稻。2无论是常规籼稻还是杂交籼稻 ,NUEp在抽穗至成熟这段时间内均有较大幅度的提高 ,两类籼稻分别提高 2 8.2 %和 1 3 .3 %。 3杂交籼稻的 NUEp在抽穗期高于常规籼稻 ,成熟期则低于常规籼稻 ;而杂交籼稻的 NUEg则比常规籼稻高。4随品种 (组合 )产量水平的提高 ,杂交籼稻及常规籼稻的氮利用效率 (包括 NUEp及 NUEg)下降 ,且变化幅度减小 ,而氮收获指数 (NHI)则有所提高。 5杂交籼稻的产量、物质生产量与抽穗前的吸氮量的相关关系未达显著水平 ,与总吸氮量呈极显著的正相关 ;而常规籼稻的产量及物质生产量与抽穗前的吸氮量及总吸氮量均呈极显著的正相关
Under potted condition, the differences of nitrogen use efficiency among representative varieties (combinations) of 19 conventional indica rice and 16 hybrid indica rice were studied. The results showed that: 1 NUEp and NUEg of conventional indica rice and indica hybrid rice were both higher than that of other indica hybrid rice varieties, but the coefficient of variation of both were large, The variation range is lower than conventional indica rice. Both conventional indica rice and indica hybrid rice showed a significant increase in NUEp from heading to maturity, with two types of indica rice increasing by 8.22% and 13.3% respectively. The NUEp of hybrid indica rice was higher than that of conventional indica rice at heading stage, but lower than that of conventional indica rice at mature stage. The NUEg of indica hybrid rice was higher than that of conventional indica rice. With the improvement of yield (combination), the nitrogen use efficiency (including NUEp and NUEg) of hybrid indica rice and conventional indica rice decreased with the change range decreased, while the nitrogen harvest index (NHI) increased. 5 The correlation between the yield of indica rice and its material yield and the nitrogen uptake before heading was not significant, which showed a significant positive correlation with the total nitrogen uptake. However, the yield and material yield of conventional indica rice was similar to that before heading Nitrogen and total nitrogen uptake were significantly and positively correlated