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Drought and light are two major factors limiting the growth of cool-season turfgrasses in many areas. The main objective of the present study was to investigate the effects of both irrigation levels and light duration on growth and quality of tall fescue. In order to, a greenhouse experiment was conducted to evaluate the interaction of photoperiod and irrigation on Festuca arundinacea Schreb. at the Research Greenhouse of the Department of Horticultural Sciences, College of Agriculture, Shiraz University, Shiraz, Iran. The experiment was conducted with four field capacity regimes (25%, 50%, 75% and 100%) and three light durations (8, 12 and 16 h) in a completely randomized design factorial arrangements with four replications. Results showed that decreasing field capacity and photoperiod decreased fresh and dry weights of shoot and root, chlorophyll contents and superoxide dismutase, catalase and ascorbate peroxidase activities. Decreasing the field capacity increased proline content and peroxidase enzyme activity. In overall, results showed that, the increase in day lengths alleviates the destructive effects of reduced irrigation and vice versa. [ABSTRACT FROM AUTHOR]