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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

期刊文章

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
来自期刊
Journal of environmental quality (USA)
ISSN : 0047-2425

书目信息

语言:
English
类型:
Journal Article
自何时收录于AGRIS:
1999
卷:
27
期:
2
起始页:
277
结束页:
293
所有题名:
"Phosphorus loss in agricultural drainage: historical perspective and current research"@eng
其它:
"references. Paper presented at an Invitational Symposium entitled, "Agricultural Phosphorus and Eutrophication," November 5, 1996"
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书目信息

语言:
English
类型:
Journal Article
自何时收录于AGRIS:
1999
卷:
27
期:
2
起始页:
277
结束页:
293
所有题名:
"Phosphorus loss in agricultural drainage: historical perspective and current research"@eng
其它:
"references. Paper presented at an Invitational Symposium entitled, "Agricultural Phosphorus and Eutrophication," November 5, 1996"