Overview of the Fertiliser and Feed Testing Programme The Department is actively monitoring fertiliser products, including protected urea, to ensure compliance with Irish and EU rules on nutrient content, labelling, and safety. Using high-performance liquid chromatography (HPLC), authorities determine the presence of urease inhibitors in urea-based fertilisers, specifically N-(n-butyl) thiophosphoric acid triamide (NBPT) and N-(n-propyl)thiophosphoric…