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¹ Harran Üniversitesi Akçakale Meslek Yüksek Okulu, Şanlıurfa
² Harran Üniversitesi Ziraat Fakültesi Tarla Bitkileri Bölümü, Şanlıurfa DOI : 10.21566/tarbitderg.359034 - This study was carried out under supplementary irrigated conditions in the Harran Plain conditions in 2008–2009 and 2009–2010 growing seasons. The study aimed to determine the effects of various ethephon dosses on some spike characteristics of durum wheat varieties. Aydin-93 and Alibaba wheat cultivars were used as crop materials. The experimental design was established in split plots with 4 replicates. Nine ethephon dosages (0, 240 g ha-1, 360 g ha-1, 480 g ha-1, 600 g ha-1, 720 g ha-1, 840 g ha-1, 960 g ha-1, 1080 g ha-1) were applied in the study. According to the results of the two-year combined analysis, spike length decreased but kernel weight of spike and thousand kernel weights increased with ethephon applications. Spike length varied from 6.67 cm (control) to 5.20 cm (960 g ha-1) in Aydin-93 variety and from 6.46 cm (control) to 5 cm (1080 g ha-1) in Alibaba variety. The highest kernel weight of spike was found at 1080 g ha-1 ethephon application (2.97 g) whereas the lowest value was seen at control applications (1.28 g) in Aydin-93 variety. The highest kernel weight of spike was found at 1080 g ha-1 ethephon application (2.86 g) but the lowest value was seen at control application (1.30 g) in Alibaba variety. Thousand kernel weights were between 38.24 g (control) and 49.76 g (960 g ha-1) in Aydin-93 variety and between 37.45 g (control) and 49.13 g (1080 g ha-1) in Alibaba variety. Keywords : Wheat, ethephon, spike characteristics