A liquid formulation containing at least about 500 ae g/L, and up to 625 ae g/L or more, of glyphosate, a surfactant that is efficacy-enhancing for glyphosate and is compatible with potassium glyphosate and which constitutes less than about 100 g/L of the formulation, non-amphiphilic cations, the majority of which are potassium cations, a low molecular weight acid or conjugate base thereof that is chemically distinct from glyphosate, and water.