Abstract: A ternary quadratic rotational combinational design was used to determine the effects of nitrogen (N), phosphorus (P) and potassium (K) fertiliser on bermudagrass soilless sod over plastic. The spent mushroom compost was used as the main substrate and coal cinder, sludge and sand as the assistant mixtures. Sod performance, such as establishment time, sod formation time, root activity, sod weight, aboveground and underground biomass, chlorophyll content and density, and integrated turf quality of different fertiliser mixture, were analysed. Sod weight was stable but there were significant differences in the other parameters. All three factors influenced integrated turf quality, but P was the most important. The interactions among the three factors were significant. The regression model between integrated turf quality and three ingredients was established with the method of fuzzy subordinate function analysis, and the optimal mixture of fertilisers was obtained using simulations, one of which was: 3.403 5-3.746 8 g/m² N, 8.673 7-9.450 7 g/m² P₂O₅ and 4.576 9-4.697 7 g/m² K₂O.