This assessment of the role of nitrogen fertilizer in the nitrogen cycle has a regional focus, emphasizing the need to maintain food and fiber production while minimizing environmental impacts where fertilizer is abundant, and the need to enhance fertilizer utilization in systems where nitrogen is limited.
Arvin R. Mosier is a research chemist for the USDA Agricultural Research Service, Fort Collins, Colorado. J. Keith Syers is Vice-President for International Relations, Naresuan University, Phitsanulok, Thailand. John R. Freney is a chief research scientist (retired), CSIRO, Division of Plant Industry, Canberra, Australia. The Scientific Committee on Problems of the Environment (SCOPE) was established by the International Council for Science (ICSU) in 1969. It brings together natural and social scientists to identify emerging or potential environmental issues and to address jointly the nature and solution of environmental problems on a global basis.With its headquarters in Paris, France, SCOPE programs are conducted by volunteer scientists from every inhabited continent of the globe.