再生稻根系形态和机能的品种间差异及与产量的关联性

观察比较了再生稻根系形态和机能的品种间差异以及与产量的关联性，结果表明，汕优明86的根系形态发达，机能高而持久，头季和再生季产量都最高；汕优63的根量和机能次之，双季产量居次；特优70头季根系发达，但成熟期机能骤降，再生季齐穗后根系机能逐渐衰竭，头季高产而再生季低产。说明选用根系形态发达、机能高而持久的品种，是确保再生稻双季稳定高产的基础。

Morphologic and functional difference of root systems among ratooning rice varieties and its correlation with yield

The morphologic and functional diference of root systems amongthree ratooning rice varieties and its correlation with yield were studied.The results showed that,Shanyouming 86 had the most flourishing root systems and the highest,lasting function,and its yield in the first season and ratooning season was the highest.In Shanyou 63,its root quantity,function and the yield in both seasons were the second.Teyou 70 had flourishing root system in the first season,but its function sharply dropped after mature period，and gradually went bad after heading stage of the ratooning season so that its yield was high in the first season and low in ratooning season.Therefore,the rice variety with flourishing root systems and high and lasting function will contribute to high and stable yield for ratooning rice.