Abstract: Water conditioner compositions useful for agricultural formulations are disclosed. The compositions comprise ammonium sulfate, water, an optional antifreeze agent, and a blend comprising a C12-C14 fatty amine oxide and a C8-C10 fatty amine oxide. Agricultural formulations that comprise a weak acid-based herbicide and the water conditioner compositions are also described. The fatty amine oxides are compatible with the levels of ammonium sulfate needed for effective water conditioning. The formulated water conditioners resist separation for weeks at elevated and cold temperatures. Compared with water conditioners that contain alkylpolyglucosides, those formulated with the fatty amine oxide blends have reduced foaming problems and excellent wetting properties at relatively low surfactant concentration, thus demonstrating performance and cost advantages.