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¹ Doğu Akdeniz Tarımsal Araştırma Enstitüsü Müdürlüğü, Adana DOI : 10.21566/tarbitderg.281545 - Sunflower (Helianthus annuus L.), is an important oil plant especially for arid and semiarid regions. The present study was carried out to determine the effect of different sowing dates on seed yield and quality in two sunflower cultivars grown in second crop watery conditions of Adana in 2010-2011. The field experiment was set up in a split plot design and two sunflower varieties (Şems and Sanbro) were assigned to the main plots and and five sowing dates (12 June, 22 June, 02 July, 12 July and 22 July) were assigned to the subplots. In the study, earliness, plant height, grain yield, 1000-grain weight, head diameter, oil ratio and oil yield values were examined. According to the trial sowing dates; Grain yield 169.7-349.7 kg /da plant height 139.5-170.5 cm, 1000-grain weight 43.3-58.9 g, head diameter 15.5-22.9 cm, oil ratio 29.96-40.37%, oil yield 52.36-141.3 kg/da and earliness 48.1-54.7 days has been found. Çukurova region at the most appropriate time for sowing oilseed sunflower to be grown in the second crop has been identified as June 12th. However, when sowing date was witdrawn early, determined to increase the efficiency of yield. Keywords : Helianthus annuus L., sunflower, seed yield, oil ratio, sowing date