Decadal-scale changes of nitrate in ground water of the United States, 1988-2004.


This study evaluated decadal-scale changes of nitrate concentrations in ground water samples collected by the USGS National Water-Quality Assessment Program from 495 wells in 24 well networks across the USA in predominantly agricultural areas. Each well network was sampled once during 1988-1995 and resampled once during 2000-2004. Statistical tests of… (More)
DOI: 10.2134/jeq2007.0055


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