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Tag: "USGS"

usgs_atrazine study

USGS Study: Atrazine Unlikely to Exceed Drinking Water Standard in Agricultural Groundwater

[ 0 ] March 14, 2012

From USGS via Journal of Environmental Quality: …Atrazine is one of the most extensively used agricultural herbicides in the United States, with an average annual use (1992–1995) of 29 million kg active ingredient applied to about 231,000 km2 of cropland (primarily corn and sorghum) (Thelin and Gianessi, 2000).  National models of atrazine occurrence in shallow […]

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pesticides_groundwater

Pesticides Dropping in Groundwater?

[ 0 ] October 27, 2008

From Discovery News: Pesticide concentrations in groundwater held constant or decreased over a recent 10-year period, according to a nationwide survey conducted by the U.S. Geological Survey.The study sampled 362 wells across the country from 1993 to 1995 and again from 2001 to 2003. “Looking at trends, it doesn’t look like we’re seeing any increases […]

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