This study was conducted to determine the irrigation scheduling based on the Crop Water Stress Index (CWSI) of cool (CS) and warm-season (WS) turfgrass species under sub-drip irrigation method in Turkey. Field experiment was carried out during the summer period of 2018 in the Agricultural Production and Research Centre (TURAM) of Silivri municipality, Istanbul, -Turkey (41°03ʹN; 28°00ʹE; 46 masl). Three irrigation strategies [I1:30%, I2:50%, and I3:70%) were tested in a split-plot randomized complete block design with three replications. These strategies corresponded, respectively, to 30%, 50% and 70% of total available soil moisture depletion at 0-30 cm of effective root zone and returning soil moisture back to field capacity.
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The results indicated that colour, quality, fresh yield, dry matter yield, irrigation water use efficiency, water use efficiency and vegetation height and mowing were significantly different in terms of irrigation strategies for both species. The most appropriate irrigation strategies were I2:50% for CS and I3:70% for WS turfgrass which corresponded to the CWSI of 0.47 and 0.45, respectively. The amount of applied irrigation in WS turfgrass was 53% less than in CS turfgrass. Actual evapotranspiration was 26% lower for WS than for CS turfgrass.
