The method is used for the determination of the mass fraction of all primary and secondary nutrients(macronutrients) in fertilizers by capillary electrophoresis. The method allows the determination of suchmacronutrients as ammonium nitrogen (ammoniacal nitrogen, NH4-N), nitrate nitrogen (NO3-N), phosphorus(P or P2O5), potassium (K or K2O) as well as sodium, magnesium, calcium, sulfur, chlorine (chloride), fluorine(fluoride).