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United States Department of Agriculture

Agricultural Research Service

Title: Denitrification in a Restored Riparian Zone Adjacent to a Swine Wastewater Spray Field

item Matheny, Terry
item Hunt, Patrick
item Stone, Kenneth
item Szogi, Ariel - NC STATE UNIV
item Humenik, Frank - NC STATE UNIV

Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: August 15, 1995
Publication Date: N/A

Technical Abstract: Potential denitrification was determined on a restored riparian zone adjacent to a swine wastewater spray field. Soil samples were collected from multiple locations along two transects of the riparian zone. Soil depth to the water table ranged from 30 to 150 cm. Samples were amended with 200 mg/L of NO3 and/or 2 gm/L of glucose-C. Denitrifier enzyme activity ranged from 5 to 190 ng N2O g/dry soil/h for unamended samples and was dependent upon water table depth. Denitrification was significantly enhanced (5-fold increase, p=0.0001) with NO3 amendment. Increased denitrification with additions of NO3 indicated that the sites are nitrate limited, even though NO3 concentrations in the groundwater ranged from 15 to 100 mg/L. Amendment with carbon did not significantly (p=0.776) enhance denitrification.

Last Modified: 4/21/2015
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