The paper reports on laboratory chamber studies on Australian agricultural systems (sugarcane trash, wheat soils) carried out to determine the extent of reduction in NH3 emissions as a result of using NBPT under continuous flow systems under different temperatures. The results showed that NBPT reduced the peak NH3 emissions that occurred soon after fertilizer application and that temperature and environmental conditions (eg. soil type, plant residue) influenced the extent of reduction. On sugarcane trash the peak of NH3 emissions from urea fertilization occurred over 8 and 12 days after fertilization at 25 and 33oC respectively, with emissions after these days similar for the urea and urea + NBPT treatments. NBPT reduced NH3 emissions by 55 and 39% over 21 days at 25 and 33oC respectively. In a wheat cropping clay loam soil at cooler temperatures (15oC) the peak NH3 emissions from urea occurred over 16 days after fertilization and NBPT reduced these emissions by 79%. NBPT shows promise for improving the N-use efficiency of urea fertilizer in some Australian agricultural industries.