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- Sharpley, A.N.; Withers, P.J.A.
- Fertilizer research 1994 v.39 no.2 pp. 133
- phosphorus; farming systems; losses from soil; eutrophication; runoff; watershed hydrology; water pollution; pollution control; nutrient management; nonpoint source pollution; administrative management; Europe; United States
- ... Freshwater eutrophication is often accelerated by increased phosphorus (P) inputs, a greater share of which now come from agricultural nonpoint sources than two decades ago. Maintenance of soil P at levels sufficient for crop needs is an essential part of sustainable agriculture. However, in areas of intensive crop and livestock production in Europe and the U.S.A., P has accumulated in soils to le ...