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¹ Batı Akdeniz Tarımsal Araştırma Enstitüsü, Antalya Viewed : 1970 - Downloaded : 1110 In this research, effects of some presowing treatments on germination of Common sour orange (Citrus aurantium L.) rootstock which is commercially used for seedling production in our country were investigated. For this purpose two different presowing treatments were done to coat removed and unremoved seeds. In first treatment seeds were dipped in to 35 0C hot water for 2, 4 and 8 days duration. In the second treatment priming application were done at 2 % KNO₃ solution for 4, 8 and 12 days duration. At Common sour orange seeds the highest germination rates were obtained from priming application at KNO₃ solution for 4 days and unremoved control treatments. In this application, coat removing didn`t effect the germination. In common sour orange rootstock coat removing treatment induced the germination speed of the seeds. With this research, it is revealed that, seed coat removing and osmotic priming applications can be used for inducing germination rates of citrus. Keywords : Citrus, Rootstock, Germination, Priming, KNO₃