作　　者： ; ; ; ;

机构地区： 沈阳农业大学

出　　处： 《沈阳农业大学学报》 2003年第5期344-346,共3页

摘　　要： 以秋光和辽粳5号为试材 ,采用盆栽方法 ,研究了不同供氮水平对根系的影响。研究结果表明 :生育前期各处理的水稻根数、最长根长、根体积、根干重及其根系活力差异不显著 ;在拔节期 ,高氮素水平有利于促进根系生长 ,提高根系活力 ;抽穗期是水稻一生中根系生长和活力变化的转折点 ,抽穗期后根系各性状呈现大幅度下降趋势 ,但高氮水平下根系各性状降幅较小 ,这说明适当提高氮素供应水平有利于维持后期根系活力 ,延缓根系衰老。 With japonica rice varieties of Akihikari Liaojing 5 as materials, effects of different levels of nitrogen treatment on japonica rice roots were studied under pot-culture conditions. The results showed that there was not obvious difference among the number, max-length, volume, dry weight and activity of roots with different levels of nitrogen treatment at early stage; during the jointing stage, high level of nitrogen contributed to root growth and increased its activity; heading stage was a key stage to root systems, from then on, the root grew slowly and its activity decreased to a great extent, but changes happened more slowly under high nitrogen condition. This might proved that high nitrogen is positive to maintain root activity and postpone root senescence.

关 键 词： 氮素水平 粳稻 根系 形态 活力 秋光 辽粳 号 生育前期 拔节期 抽穗期

领　　域： [农业科学]