From Gloom to Glory: Revisiting Nitrogen Fertilizer Use in Cereal Production, Gaseous Emission Trends, Challenges and Pathways to Sustainability

Synthetic nitrogen fertilizer underpins global cereal production, yet a substantial share of applied nitrogen escapes to the atmosphere as nitrous oxide, ammonia, and nitrogen oxides, with significant consequences for climate, air quality, ecosystems, and soil health. Despite extensive research on nitrogen losses and mitigation options, no synthesis has traced the historical intensification of cereal nitrogen use, current emission patterns, and the technological and policy responses to these losses as a single connected trajectory. This review provides that integrated synthesis. This review adopts a gloom-to-glory framing to trace nitrogen fertilizer use in cereal systems from its Green Revolution origins through current emission trends to the technological and policy responses now being deployed, treating these as a single continuous narrative rather than separate bodies of literature. Global nitrogen application in maize, wheat, and rice rose roughly tenfold between 1961 and 2010, and more than half of applied nitrogen across this period was never recovered in harvested grain. This unrecovered fraction partitions across mechanistically distinct loss pathways, i.e., nitrous oxide from soil nitrification and denitrification, ammonia from urea hydrolysis and volatilization, and indirect losses from residual soil nitrate, each carrying separate climate, air quality, and ecosystem consequences. Enhanced-efficiency fertilizers, precision nitrogen management, renewable hydrogen-based ammonia synthesis, and biologically mediated approaches such as nitrification inhibition each demonstrate mitigation potential without compromising yield, though field-scale evidence for the biological route remains limited. Regional case studies from China, India, and the European Union show that national policy has altered nitrogen use trajectories without closing the gap to demonstrated best-practice potential, for reasons specific to each jurisdiction’s regulatory design, price structure, and institutional capacity. The review concludes that the principal barriers to realising cereal production’s glory pathway are no longer primarily mechanistic but lie in measurement coverage, technology transfer to smallholder and developing-region producers, and the economic architecture needed to scale proven mitigation measures across cereal-growing regions.