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Denitrification in a Coastal Plain Riparian Zone Contiguous to a Heavily Loaded Swine Wastewater Spray Field

P. G. Hunt*, T. A. Matheny and K. C. Stone

USDA-ARS, Coastal Plains Soil, Water, and Plant Research Center, Florence, SC 29501



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Fig. 1. A schematic of the experimental site including spray field, riparian zone, stream, and soil sampling sites.

 


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Fig. 2. Linear regression of denitrification enzyme activity vs. total soil nitrogen in the soil of a riparian zone contiguous to a swine wastewater spray field.

 


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Fig. 3. Linear regression of denitrification enzyme activity vs. total soil nitrogen in the soil of riparian zone contiguous to a swine wastewater spray field when nitrate was added to the soil before incubation.

 


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Fig. 4. Linear regression of denitrification enzyme activity vs. total soil nitrogen in the soil of riparian zone contiguous to a swine wastewater spray field when glucose was added to the soil before incubation.

 


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Fig. 5. Linear regression of denitrification enzyme activity vs. total soil nitrogen in the soil of riparian zone contiguous to a swine wastewater spray field when nitrate and glucose was added to the soil before incubation.

 





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