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Nitrous Oxide Flux from Poultry-Manured Erosion Plots and Grass Filters after Simulated Rain

Department of Agronomy, N-122 Agricultural Science Building North, Univ. of Kentucky, Lexington, KY 40546-0091.

^* Corresponding author (mscoyn00{at}ukcc.uky.edu).

ABSTRACT

Adding carbon-rich materials to fields, like manure, may enhance denitrification. Grass filters, which are used to trap surface runoff from these fields, may also provide a carbon-rich environment that favors water infiltration and denitrification. Nitrous oxide (N₂O) may be evolved these settings. It is a radiatively important trace gas and intermediate in the denitrification pathway and several other microbial processes. We measured N₂O flux, after simulated rain, using a soil cover technique in poultry-manured plots and grass filters receiving their runoff. Intact soil cores were used to relate the N₂O flux to the denitrification potential of the plots. Nitrous oxide fluxes were smaller in grass filters than in manured plots, even though more denitrifying bacteria were present. The average N₂O flux in the three most dynamic erosion plots was 755 µg N₂O-N m^–2h^–1, which was 39% of the maximal denitrification rate measured in acetylene-blocked, NO^–₃-amended soil cores. Nitrous oxide flux immediately after rainfall was greater than N₂O flux measurements reported for similar agricultural settings.