Vigor index is a better criterion representing the quality of seeds for sowing ra-ther than the percent germination.Percent germination of seeds treated withaccelerated aging or germinated at supraoptimal or suboptimal temperature willshow the data near to the actual quality of seeds similar to the vigor index.Pre-chilling(3—5℃)the seeds before sowing will increase the vigor of seeds andimprove the performance.Soaking the seeds with ethrel(50—500 ppm)will has-ten the germination of seeds

and increase the vigor index.