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

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

View larger version (25K): [in a new window]   Fig. 1. A schematic of the experimental site including spray field, riparian zone, stream, and soil sampling sites.

View larger version (26K): [in a new window]   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.

View larger version (27K): [in a new window]   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.

View larger version (26K): [in a new window]   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.

View larger version (25K): [in a new window]   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.