The aim of this study is to determine the effects of deficit irrigation applications at different levels on the cool-season turf mix and warm-season turfgrass species irrigated by sprinkler irrigation method and sub-drip irrigation method. Field experiments were conducted in the Agricultural Production and Research Center (TURAM) of Silivri Municipality in the boundaries of Tekirdağ and Istanbul - TÜRKİYE (41°03ʹN; 28°00ʹE; 46 m a.s.l.) in the summertime of 2019 and 2020. In this research, two different irrigation methods (SI: Sprinkler and SDI: sub-drip), for two different turfgrass types (CS: Cool-season turfgrass mix and WS: Warm-season turfgrass), at three different irrigation levels (I1: full irrigation, I2: 1/3 deficiency, I3: 2/3 deficiency) were examined in split split plots in randomized blocks design with three replications. Soil moisture content was monitored via TDR for irrigation scheduling, climatic data needed for ETo estimation were taken from automatic meteorology station established in experimental area, canopy temperature for CWSI calculation was measured by infrared thermometer. When the results were evaluated in terms of irrigation methods, 6-36% less irrigation water was applied with SDI method according to SI method due to the high-water application efficiency and low evaporation.  Besides, it has been concluded that deficit irrigation for cool season turfgrass mix has not been possible by SI method whereas deficit irrigation of 1/3 can be applied by SDI method on the condition of a little bit compromising the color quality. Thus, 38% irrigation water saving was achieved by SDI method. Although there was no any decrease in the density value, irrigation deficiency was not possible due to the decrease in the color parameter in Bermudagrass under SI method. However, irrigation water deficiency of 1/3 can be managed without any problem in visual quality in the same grass type under SDI method. Thus, approximately 50% irrigation water saving can be achieved compared to the SI method. Moreover, the CWSI is a valuable tool for monitoring and quantifying water stress and scheduling irrigations. CWSI of 0,12; 0,13; 0,31 and 0,39 are irrigation thresholds for CS and WS under SDI method for CS and WS under SI method, respectively.  Keywords: Landscape irrigation, Turfgrass varieties, Irrigation methods, Irrigation water saving, Crop water stress index (CWSI) This Project was funded by The Scientific and Technological Research Council of Turkey (TÜBİTAK).