Flows of nitrogen (N) and phosphorus (P) in U.S. agriculture, 1988 (million metric tons). Calculated by the authors from various sources, including Smil (1993).
The National Academies of Sciences, Engineering, and Medicine 500 Fifth St. N.W. | Washington, D.C. 20001
"Use of Materials Balances to Estimate Aggregate Waste Generation in the United States."
Measures of Environmental Performance and Ecosystem Condition.
Washington, DC: The National Academies Press, 1999.
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