Abstract
Water quality in the Middle Coastal Plain of North Carolina has been impacted by agriculture; however, the water quality impacts in these areas over time have not been studied in detail. The surface water quality of several streams in the Neuse River Watershed along the Middle Coastal Plain of North Carolina was monitored for approximately five years, while shallow groundwater in cropped fields and adjacent to drainage ditches was monitored for three years. Surface water samples were collected biweekly and analyzed for nitrate nitrogen (N O3 -N) , ammonium nitrogen (N H4 -N) , total Kjeldahl nitrogen, orthophosphate (P O4 -P) , total phosphate, and total suspended solids, and approximately monthly groundwater samples were collected from wells and analyzed for N O3 -N . Trends relating to seasonal changes in stream water quality as a function of land use and soil type were analyzed, as well as long term changes. Generally, upstream sampling points showed low levels of all constituents. Nutrient and sedimen...
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