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Contamination of shallow groundwater by NO3- from manure may occur under fields where manure is spread as fertilizer and for disposal. Attenuation of NO3- in groundwater occurs through denitrification under certain conditions, or NO3--contaminated younger groundwater may mix with older groundwater, lowering the NO3- concentration. In this study, δ 15 N and δ 18 O values of NO3-, and...
Abstract. The intensity of agriculture has increased significantly during the past 30years, resulting in increased detection of agricultural contaminants (nutrients, pesticides, salts, trace elements, and pathogens) in groundwater. Till, glaciolacustrine, and loess deposits of Quaternary age compose the most common surficial deposits underlying agricultural areas in North America. Quaternary aquitards...
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