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Elevated nitrogen and phosphorus still widespread in much of the nation's streams and groundwater
Date:9/27/2010

ting concentrations vary across the Nation. For example, concentrations of nitrogen generally are highest in agricultural streams in the Northeast, Midwest, and the Northwest, which have some of the most intense applications of fertilizer and manure in the Nation.

Differences in concentrations across the Nation also are due to natural features and human activities. For example, concentrations of nitrogen in streams draining parts of the agricultural Midwest are increased by contributions from artificial subsurface tile drains that are used to promote rapid dewatering of poorly drained soils. Conversely, concentrations of nitrate in streams draining parts of the Southeast appear to dissipate faster as a result of enhanced natural removal processes in soils and streams.

"This nationwide assessment of sources and natural and human factors that control how nutrients enter our streams and groundwater helps decision-makers anticipate where watersheds are most vulnerable to contamination and set priorities and management actions in different geographic regions of the country," said Dubrovsky.


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Contact: Kara Capelli
kcapelli@usgs.gov
571-420-9408
United States Geological Survey
Source:Eurekalert

Page: 1 2 3

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