An experiment with a randomised split plot design was performed to assess the yield, irrigation water use efficiency, energy requirements and quality of tomatoes (Lycopersicon esculentum cv. BT236 F-1) grown with drip irrigation on the Alpu Plain in north-western Central Anatolia, Turkey. During a trial period involving three replications from 2009 to 2011, a Class A pan was used to measure the daily evaporation values of treatments in split plots with different emitter spacing (25 cm and 50 cm) and irrigation rates (20%, 30%, 40% and 50% of the evaporation rate of the Class A pan). Among the results, annual evaporation during the trial period ranged from 550.9 mm to 721.4 mm, and whereas higher irrigation rates afforded higher yields, lower ones afforded higher irrigation water use efficiency (IWUE). The average weight, vitamin C content, total soluble solid (TSS) content and pH values for tomatoes, all used in the proposed irrigation ratio, were 149 g, 99.18 mg kg(-1), 6.21% and 4.17, respectively. The energy requirement of irrigation water for diesel and electric consumption changed from 42 to 105 L and 140.6 and 351.4 kWh/ha, on average, respectively.