Laboratory experiments were conducted to study the effects of light, different growth media,: temperature, and salt concentrations on the germination ratio, mean germination period, and the beginning of germination of cotton seeds, Gossypium hirsutum L., cv. Nazilli 87. All factors considerably affected the germination rate of cotton seeds, ranging from 47 % at darkness to 96 % at 16 h of artificial light. The mean germination period varied from 5.6 days at 15 degrees C and 1.3 days at 30 degrees C under illumination and lasted longer at dark. The germination ratio was 94 % without additional salt and decreased from 63 % at salt concentration of 175 mM NaCll(-1) to only 8.7 % at 300 mM l(-1). The mean germination period ranged from 5.28 days to 13.50 days at salt concentrations of 0-300 mM NaCll(-1), respectively.