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¹ Ankara Üniversitesi Ziraat Fakültesi Tarla Bitkileri Bölümü, Ankara - This research was carried out between 1995-98 years in Central Anatolia Region (Haymana) conditions. Aim of the research was to determine yield and some yield components of main crop wheat in fallow-wheat, winter lentil-wheat and wheat-wheat rotation systems with conventional (plough) and conservation (rototiller) soil tillage applications. According to obtained results, effects of soil tillage with plough and rototiller on the yield and yield components of wheat were not evident, plough was superior in the fallow plots. Fallow-wheat crop rotation system was given higher grain yield and yield components. Winter lentil-wheat crop rotation system was second after fallow-wheat while continuous wheat was given lowest yield and yield components, values. Keywords : Wheat; crop rotation system; soil tillage; yield