Peter M. Vitousek, John D. Aber, Robert W. Howarth, Gene E. Likens, Pamela A. Matson, David W. Schindler, William H. Schlesinger, David G. Tilman, Technical Report: Human Alteration of the Global Nitrogen Cycle: Sources and Consequences, Ecological Applications, Vol. 7, No. 3 (Aug., 1997), pp. 737-750
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Vitousek et al. (1997) studied this question.
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