As climate variability increases and urban water demand rises, the turfgrass industry faces challenges in maintaining high-quality landscapes with limited irrigation. Water restrictions and escalating costs necessitate sustainable solutions to improve water efficiency without compromising turf performance. Research from the University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) has shown that compost incorporation can enhance soil structure, increase plant-available water, and potentially reduce irrigation needs for warm-season turfgrasses in Florida. While initial studies demonstrated benefits for new landscape installations, limited research exists on established lawns. Our study aims to evaluate the influence of compost and fertilizer applications under varying irrigation conditions on turfgrass quality. This study, conducted in 2023 and 2024 at the UF/IFAS Plant Science Research and Education Unit in Citra, Florida, examines the combined effects of compost and fertilizer applications under different irrigation regimes. The experimental design had six distinct management practices: a control with neither compost nor fertilizer; compost topdressing once per growing season; combined compost topdressing and fertilizer application once per season; compost topdressing twice per season; both compost and fertilizer applied twice per season; and fertilizer alone applied twice per season. Irrigation was applied at 50%, 75%, and 100% of UF/IFAS recommendations. Compost was applied at 0.5 yd³/1000 ft², and fertilizer at 1.0 lb N/1000 ft². Results from statistical analysis consistently demonstrated that compost topdressing combined with fertilizer twice per season (CTD
