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The National Agricultural Library is one of four national libraries of the United States, with locations in Beltsville, Maryland and Washington, D.C. It houses one of the world's largest and most accessible agricultural information collections and serves as the nexus for a national network of state land-grant and U.S. Department of Agriculture field libraries. In fiscal year 2011 (Oct 2010 through Sept 2011) NAL delivered more than 100 million direct customer service transactions.

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Journal Article

Artículo de revista

Phosphorus loss in agricultural drainage: historical perspective and current research  [1998]

Sims, J.T. (Univ. of Delaware, Newark, DE.); Simard, R.R.; Joern, B.C.;

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The importance of P originating from agricultural sources to the nonpoint source pollution of surface waters has been an environmental issue for decades because of the well-known role of P in eutrophication. Most previous research and nonpoint source control efforts have emphasized P losses by surface erosion and runoff because of the relative immobility of P in soils. Consequently, P leaching and losses of P via subsurface runoff have rarely been considered important pathways for the movement of agricultural P to surface waters. However, there are situations where environmentally significant export of P in agricultural drainage has occurred (e.g., deep sandy soils, high organic matter soils, or soils with high soil P concentrations from long-term overfertilization and/or excessive use of organic wastes). In this paper we review research on P leaching and export in subsurface runoff and present overviews of ongoing research in the Atlantic Coastal Plain of the USA (Delaware), the midwestern USA (Indiana), and eastern Canada (Quebec). Our objectives are to illustrate the importance of agricultural drainage to nonpoint source pollution of surface waters and to emphasize the need for soil and water conservation practices that can minimize P losses in subsurface runoff
Publicación
Journal of environmental quality (USA)
ISSN : 0047-2425

Información bibliográfica

Idioma:
English
Tipo:
Journal Article
En AGRIS desde:
1999
Volumen:
27
Edición:
2
Página inicial:
277
Página final:
293
Todos los títulos:
"Phosphorus loss in agricultural drainage: historical perspective and current research"@eng
Otro:
"references. Paper presented at an Invitational Symposium entitled, "Agricultural Phosphorus and Eutrophication," November 5, 1996"
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Información bibliográfica

Idioma:
English
Tipo:
Journal Article
En AGRIS desde:
1999
Volumen:
27
Edición:
2
Página inicial:
277
Página final:
293
Todos los títulos:
"Phosphorus loss in agricultural drainage: historical perspective and current research"@eng
Otro:
"references. Paper presented at an Invitational Symposium entitled, "Agricultural Phosphorus and Eutrophication," November 5, 1996"