Abstract
A laboratory experiment was conducted for testing the effect of soaking the seeds in the growth regulator Atonik as seed treatment on germination of three water melon cultivar: (Charleston76, Charleston Grey, Charlee), these cultivars were treated with two Atonik concentrations before sowing in plastic dish inside laboratory. Results indicated a significant increase in germination speed and germination percentage. Charlee gave higher germination speed (11.83)seed/day and higher germination percentage(69.33)%.The soaking seeds in Atonik gave best result in all the studied characters as compared with the control treatment .The interaction between cultivars and Atonik concentration was significant ,the seeds of Charlee which soaked in Atonik gave highest germination speed (12.32)seed/day and higher germination percentage (73.33)% .