杂交水稻具有显著的增产效果,现有的优良组合,一般较常规稻每亩增产150—200斤.近年来,随着杂交水稻栽培面积的扩大,三系的退化也非常突出.因此,怎样进行三系的提纯保纯,确保杂交水稻的增产效果,已成为各级领导和种子科技工作者极为关注的问题.以往一些地方曾用常规稻的提纯方法, Hybrid rice has a significant yield-increasing effect, the existing good combination, generally increased 150-200 kg per acre compared to conventional rice.In recent years, with the expansion of hybrid rice cultivation area, three-line degeneration is also very prominent .How to proceed Three lines of pure purification, to ensure the yield-increasing hybrid rice has become the leaders and seed science and technology workers at all levels of great concern in the past some places have used conventional rice purification methods,