This ecperiment strdies the effects of rare-earghs on the germination percentage of balloonflower seeds. The germination test was done byL1645 orthogonal method under different conditions such as rare-earth concentration,time and temperature.

• 本试验就不同的稀土浸种浓度、时间、温度,采用L_(16)~4~5正交试验的方法,对桔梗种子进行了室内发芽试验。