Objective]The difference of rooting ability of popular hybrid rice in Sichuan basin in recent years was compared to provide reference for transplanting and management of long-age seedling under thin sowing and dry nursery.[Method] Cutting the root and leaves of long-age seed-ling under thin sowing and dry nursery, then, transplanting them in paddy field.The rooting number,length,dry weight and rooting ability were investigated.[Result] There were obvious difference among the rooting ability of hybrid rice.The rooting abilities of Chuanguyou 399、Deyou 4983、Rongyou 1808 and Jingyou 127 were stronger than others, higher than average rooting ability 57.98%,51.43%,46.76%and 34.65%sep-arately.The rooting abilities of Chuanyou 8377 and Q You 5 were weaker than others, lower than average rooting ability 30.99% and 37.43%separately.[Conclusion] It is necessary to make reasonable cultivation and management measures on the basis of rooting ability of hybrid rice.%[目的]比较四川盆地近年主推杂交稻品种发根力的差异，为稀播旱育长龄秧的大田移栽及管理提供理论依据。[方法]以四川盆地近年推广的42个品种杂交稻为材料进行稀播旱育长龄秧发根力试验，采用长龄秧剪根、剪叶，大田栽植的方法，考察其新发根系的根数、根长、根干重、发根力。[结果]不同品种杂交稻的发根力存在较大差异，其中川谷优399、德优4983、蓉优1808和旌优127的发根力较强，其发根力分别高于平均发根力57．98％、51．43％、46．76％和34．65％；而川优8377和Q优5号的发根力较弱，其发根力分别低于平均发根力30．99％和37．43％。[结论]生产上应根据不同品种杂交稻的发根力强弱制订相应的栽培措施及管理技术。
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