Abstract: The aim of this study to determine germination eco-physiology of Centurea amonicola Hub.-Mor., common countryside in Turkey, under over grazing thread. For this aim, germination of the seeds investigated under two different photoperiod (8h light-16h darkness and 16h light- 8 h darkness) and in different concentrations of NaCl, KNO H SO and HCl solutions. There was no germination in 3%NaCl, 1-3% KNO 1- 3, 2 4 3, 3%H SO and 2-3% HCI concentrations in each photoperiod. According to univariate variance analyse of 2 4 germination test results, germination media with different (0,5%, 1%, 2% NaCl; 0,5%, 1%, 2%, 3% KNO 0,5% 3; H SO ; 0,5%, 1% HCl concentrations and control (8h light-16h darkness and 16h light- 8 h darkness and 24 h 2 4 light) were significant; photoperiod and photoperiod-treatment interaction were not significant on germination percentage. And different concentration levels, photoperiod and photoperiod x treatment interactions were significant on germination speed (P<0.05).