Acid solution of nitrogenous fertilizer with sulphur. 22.8% N + 60.8% SO3 + 0.03% Fe + 0.01% Zn (w/v), codasul pH is a formulation with triple action, fertilizer – acidifying – unblocking: fertilizer with a high nitrogen and sulphur content enriched with microelements; acidifier of water pH that prevents obstructions in irrigation systems; and a nutrient unblocker that facilitates the leaching of sal, increases the solubility of fertilizers used in fertigation (potassium nitrate, monoammonium phosphate), acidifies the pH of foliar application and combats nutritional disorders caused by high bicarbonate contents (chlorosis inducers).