Agriculture and the Nitrogen Cycle: Assessing the Impacts of by Arvin Mosier, J. Keith Syers, John R. Freney

By Arvin Mosier, J. Keith Syers, John R. Freney

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Extra resources for Agriculture and the Nitrogen Cycle: Assessing the Impacts of Fertilizer Use on Food Production and the Environment (Scientific Committee on Problems of the Environment (SCOPE) Series, Volume 65)

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Placement of UAN for dryland winter wheat in the Central High Plains. Agronomy Journal 95:1532–1541. Singandhupe, R. , G. G. S. N. Rao, N. G. Patil, and P. S. Brahmanand. 2003. ) European Journal of Agronomy 19:327–340. Sisti, C. P. , H. P. dos Santos, R. Kohhann, B. J. R. Alves, S. Urquiaga, and R. M. Boddey. 2004. Change in carbon and nitrogen stocks in soil under 13 years of conventional or zero tillage in southern Brazil. Soil and Tillage Research 76:39–58. Smil, V. 2001. Enriching the earth.

Finally, achievement of a widespread increase in REN requires the active collaboration of farmers, extension personnel, researchers, and governments. qxd 8/6/04 1:10 PM Page 31 2. Crop, Environmental, and Management Factors | 31 Literature Cited Agriculture and Forestry Statistics Association. 1991. Fertilizer handbook. Tokyo: Ministry of Agriculture, Forestry and Fisheries, Fertilizer and Machine Division. ) Basanta, M. , D. Dourado-Neto, K. Reichardt, O. O. S. C. M. Oliveira, P. C. O. Trivelin, L.

The effect of crop characteristics on REN is greatly modified by environmental and management factors. Clearly, differences in REN values for similar crops or cropping systems across locations are due to differences in climate, soil type, and crop management. Within a location, annual or seasonal variations in REN are caused by annual and seasonal changes in climate and the inability of farm managers to predict and timely respond to such changes in weather conditions during the growing season. qxd 28 8/6/04 1:10 PM Page 28 | II.

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