The research, that was supported by GAP Agricultural Research Institute, was conducted from 2010 to 2015 at the field belonged to metropolitan municipality of Sanlıurfa. The reseach goal was to clarify yield, oil quality, and their effects on periodicity for olive trees on natural conditions with different irrigation periods. Also, it aimed to identify an appropriate amount and time periods of applying water for olive trees by separeted 6 part fields as non-irrigated (S1), irrigated once of each 7 days (S2), each 14 days (S3), each 21 days (S4), each 28 days (S5), and each 35 days.

The first 2 years of the research period was evaluated as adaptation of the trees, then the field was started to separete to 6 parts and irrigate based on each research topic explained above. The results of statistical analysis showed that the highest yield was obtained about 1198 kg/da from S4 (irrigated once of each 21 days). The amount of applied water on S4 area was about 479 mm, and evapotranspiration rate of trees was about 834 mm.