Pedosphere 15(2): 156--, 2005
ISSN 1002-0160/CN 32-1315/P
©2005 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| N cycle, N flow trends in Japan, and strategies for reducing N2O emission and NO3- pollution |
K. MINAMI |
| National Institute for Agro-Environmental Sciences, Kannondai 3-1-3, Tsukuba 305-8604 (Japan). E-mail: mnamn@maes.affrc.jp |
| ABSTRACT |
| To feed an increasing population, large amounts of chemical nitrogen fertilizer have been used to produce much of our food, feed and fiber thereby increasing nitrogen levels in soils, natural waters, crop residues, livestock wastes, and municipal and agricultural wastes, with national and international concern about its potential adverse effects on environmental quality and public health. To understand these phenomena and problems, first the nitrogen cycle and the environment are described. Then recent trends for nitrogen cycling through the food and feed system, N2O emissions from fertilized upland and paddy soils, and NO3- pollution in ground water in Japan are reported. Finally, mitigation strategies in Japan for reducing N2O emission and NO3- pollution are proposed, including nitrification inhibitors, controlled release fertilizers, utilization of plant species that could suppress nitrification, utilizing the toposequence, government policy, and appropriate agricultural practices. Of all the technologies presented, use of nitrification inhibitors and controlled release fertilizers are deemed the most important with further development of these aspects of technologies being expected. These practices, if employed worldwide, could help reduce the load, or environmental deterioration, on the Earth's biosphere. |
| Key Words: mitigation strategy, N2O emission, NO3- pollution, nitrogen cycle |
| Citation: Minami, K. 2005. N cycle, N flow trends in Japan, and strategies for reducing N2O emission and NO3- pollution. Pedosphere. 15(2): 156-. |
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