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Published online 8 September 2005
Published in J Environ Qual 34:1828-1842 (2005)
DOI: 10.2134/jeq2004.0338
© 2005 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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TECHNICAL REPORTS

Ground Water Quality

Nitrate Movement in Shallow Ground Water from Swine-Lagoon-Effluent Spray Fields Managed under Current Application Regulations

Daniel W. Israela,*, William J. Showersb, Matthew Fountainb and John Fountainb

a USDA-ARS and Department of Soil Science, North Carolina State University, Box 7619, Raleigh, NC 27695
b J. Fountain, Department of Marine, Earth and Atmospheric Sciences, Box 8208, North Carolina State University, Raleigh, NC 27695

* Corresponding author (dan_israel{at}ncsu.edu)

Received for publication September 1, 2004. Rapid increases in the swine (Sus scrofa domestica) population in the 1990s and associated potential for nitrate N pollution of surface waters led the state of North Carolina to adopt stringent waste management regulations in 1993. Our objectives were to characterize (i) nitrate N movement from waste application fields (WAFs) in shallow ground water, and (ii) soil, hydrologic, and biological factors influencing the amount of nitrate N in the adjacent stream. A ground water monitoring study was conducted for 36 mo on a swine farm managed under new regulations. Water table contours and lack of vertical gradients indicated horizontal flow over most of the site. Nitrate N concentrations in water from shallow wells in WAFs averaged 30 ± 19 mg L–1 and {delta}15N ratios for nitrate N were between +20 and +25 per mil. Nitrate N concentration decreased from field-edge to streamside wells by 22 to 99%. Measurement of {delta}18O and {delta}15N enrichment of nitrate in ground water throughout the WAF–riparian system indicated that denitrification has not caused significant 15N enrichment of nitrate. Over a 24-mo period, {delta}15N ratios for nitrate N in the stream approached {delta}15N ratios for nitrate N in ground water beneath WAFs indicating delivery of some waste-derived nitrate N to the stream in shallow ground water. Nitrate N concentrations in the stream were relatively low, averaging 1 mg L–1. Dilution of high nitrate N water in shallow horizontal flow paths with low nitrate N water from deeper horizontal flow paths at or near the stream, some denitrification as ground water discharges through the stream bottom, and some denitrification in riparian zone contributed to this low nitrate N concentration.

Abbreviations: DOC, dissolved organic carbon • WAF, waste application field




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