An experiment was carried out using seashore paspalum (Paspalum vaginatum var. Sea Island 2000) irrigated with three freshwater: seawater combinations and two types of fertilizers, conventional and slow release. The objective of the experiment was to analyze the effects of the different concentrations of seawater on biomass production and color as well as the nutritional content of the turf. The efficiency of conventional and slow release fertilizers at different seawater and freshwater concentrations also was investigated. In comparison with the 1:0 and 3:1 combination, the irrigation with the 1:1 combination reduced foliar biomass production and color quality, but increased root biomass production. Irrigation with both combinations decreased P and K leaf content; however, the use of slow release fertilizers favored K optimum levels on the turf irrigated with the 1:1 combination. Finally, the foliar content Na increased, as compared to the fresh water treatment, was greater in the 1:1 combination, followed by the 3:1combination. This study supports the idea that irrigating seashore paspalum with seawater is a viable alternative, although tolerable levels of salinity must be managed in seawater: freshwater combination and fertilization programs must be adapted accordingly.