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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.

Actif (Le fournisseur de données a soumis des métadonnées au cours de la dernière année civile)
Journal Article

Article de revue

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
(Revue
Journal of environmental quality (USA)
ISSN : 0047-2425

Information bibliographique

Langue:
English
Type:
Journal Article
Sur AGRIS depuis:
1999
Volume:
27
Numéro:
2
Page initiale:
277
Page finale:
293
Tous les titres:
"Phosphorus loss in agricultural drainage: historical perspective and current research"@eng
Autre:
"references. Paper presented at an Invitational Symposium entitled, "Agricultural Phosphorus and Eutrophication," November 5, 1996"
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Information bibliographique

Langue:
English
Type:
Journal Article
Sur AGRIS depuis:
1999
Volume:
27
Numéro:
2
Page initiale:
277
Page finale:
293
Tous les titres:
"Phosphorus loss in agricultural drainage: historical perspective and current research"@eng
Autre:
"references. Paper presented at an Invitational Symposium entitled, "Agricultural Phosphorus and Eutrophication," November 5, 1996"