With water resources becoming more limited in arid and semi-arid regions, growers use low-quality water for irrigation. An outdoor pot experiment was conducted during the summer season of 2022 in northern Egypt to identify the best irrigation regime with saline water and K fertilizer that boosts maize tolerance for drought and salinity stresses. The salinity of irrigation water used possessed 4.38 dS/m. Irrigation levels were 40, 60, and 80% potential ET, and the types of K salt were 0.0 K(Control), K₂SO₄ (0.05 g kg^-1 soil), KNO₃ (0.05 g. kg^-1 soil), and Salwax (0.02 g kg^-1 soil). Germination percentage, growth parameters, leaves nutrient contents, yield and its attributes, and water use efficiency were monitored. The results showed that the final total soluble salt accumulated in the soil after harvest differed significantly among the three levels of irrigation. K salts had no significant effect on germination percentage and stem diameter, while Salwax significantly increased N, K, Mg, and Ca content in the maize leaves. Obviously, the KNO₃ possessed the greatest growth parameters followed by Salwax in comparison to the control. Irrespective of the irrigation level, both K₂SO₄ and KNO₃ significantly increased the biological yield over the control by 4.5%, while Salwax attained a biological yield similar to the control. All K salts increased the WUE and the biomass-WUE, where the KNO₃ had the highest positive effect. In conclusion, using saline water in irrigation maize crop is possible even at 40% of potential evaporation (ET) level with leaching monthly by 125% ET beside KNO₃ fertilization on three doses after leaching event.