Temporal Nitrous Oxide Emissions from Beef Cattle Feedlot Manure after a Simulated Rainfall Event.

摘要: Nitrous oxide (NO) is a greenhouse gas (GHG) emitted from agricultural operations. The objective of this research was to quantify NO-N emissions simulated open-lot beef cattle feedlot pens after rainfall. A recirculating-flow-through, non-steady state chamber system consisting five 1-m steel pans designed for quantifying emissions. lid placed sequentially on each pan, and headspace air recirculated between the pan real-time NO analyzer, measuring concentrations every 1 s. Air-dried manure (89.2% dry matter) commercial in Texas Panhandle then 0, 6.3, 12.7, 25.4, or 50.8 mm water applied simulate one-time rainfall event. Emissions were monitored 45 d, where two distinct episodes production observed over time. first episode had duration 10 h peaked 2 at flux 1.0 200 mg m h. second 40 d 15 0.06 35 accounted 69 91% cumulative 45-d period. Each millimeter increased by 167.9 ( = 0.99, < 0.001). This vs. relationship will be useful modeling annual feedlots, assessing effectiveness best management practices reducing GHG