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The effect of KNO₃ application on perennial ryegrass salinity tolerance was checked by pot experiment (perlite:sand 1:1), in Tabriz, Iran. The treatments were NaCl levels at 0 and 60 mM, combined with KNO₃ levels at 0, 5, 10 and 15mM, applied either to the soil, or foliarly. KNO₃ levels at 5 & 10mM promoted leaf growth at NaCl 0mM and 60mM, respectively. In NaCl 60mM treatment, however, plants treated with KNO₃, showed less reduction of leaf area, and fresh and dry weight, than plants without KNO₃. The 15mM KNO₃ treatment significantly reduced the plant’s survival to <10%. The survival percentage of plants under salinity conditions was higher for the foliar KNO₃ treatments, compared to the soil applications at the same concentrations. For instance, at 60mM NaCl, foliarly applied 5mM KNO₃ produced 47% plant survival, while soil- applied 5mM KNO₃ produced 32% surviving plants only. Foliar 5-10mM KNO₃ was ideal at these conditions.