TY - GEN
T1 - Nitrous oxide emissions from a commercial cattle feedlot in Kansas
AU - Aguilar, Orlando
AU - Maghirang, Ronaldo
AU - Rice, Charles W.
AU - Trabue, Steven
AU - Erickson, Larry E.
AU - Razote, Edna
PY - 2011
Y1 - 2011
N2 - Emission of greenhouse gases, including nitrous oxide (N2O), from open beef cattle feedlots is becoming a concern. Research measuring emission rates of N2O from open beef cattle feedlots, however, has been limited. This study was conducted to quantify the N2O emission rate from pen surfaces in a commercial beef cattle feedlot in Kansas. Static flux chambers with a diameter of 30 cm were used to measure the flux from the pen suriace as affected by pen surface conditions (i.e., moist/muddy, dry and loose, dry and compacted, and flooded) on 10 sampling days from July to November 2010. Air samples were collected from the chambers' headspace at 0, 15, and 30 min using syringes and analyzed with a gas chromatograph. From the N 2O concentrations, N2O emission fluxes were calculated. For each pen surface condition, N2O emission flux varied considerably with sampling day. Emission flux also varied with pen surface condition, with the moist/muddy surface having the largest median emission flux (7.18 mg m -2 h-1), followed by the dry and compacted, dry and loose, and flooded surfaces with median emission fluxes of 0.18, 0.17, and 0.09 mg m-2 h-1, respectively. This study quantified N 2O emission rates from pen surfaces in a cattle feedlot; further work is investigating factors that influence emission rates.
AB - Emission of greenhouse gases, including nitrous oxide (N2O), from open beef cattle feedlots is becoming a concern. Research measuring emission rates of N2O from open beef cattle feedlots, however, has been limited. This study was conducted to quantify the N2O emission rate from pen surfaces in a commercial beef cattle feedlot in Kansas. Static flux chambers with a diameter of 30 cm were used to measure the flux from the pen suriace as affected by pen surface conditions (i.e., moist/muddy, dry and loose, dry and compacted, and flooded) on 10 sampling days from July to November 2010. Air samples were collected from the chambers' headspace at 0, 15, and 30 min using syringes and analyzed with a gas chromatograph. From the N 2O concentrations, N2O emission fluxes were calculated. For each pen surface condition, N2O emission flux varied considerably with sampling day. Emission flux also varied with pen surface condition, with the moist/muddy surface having the largest median emission flux (7.18 mg m -2 h-1), followed by the dry and compacted, dry and loose, and flooded surfaces with median emission fluxes of 0.18, 0.17, and 0.09 mg m-2 h-1, respectively. This study quantified N 2O emission rates from pen surfaces in a cattle feedlot; further work is investigating factors that influence emission rates.
KW - Closed-chamber method
KW - Feedlot surface emissions
KW - Nitrous oxide
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M3 - Conference contribution
AN - SCOPUS:81255136408
SN - 9781618391568
T3 - American Society of Agricultural and Biological Engineers Annual International Meeting 2011, ASABE 2011
SP - 5186
EP - 5199
BT - American Society of Agricultural and Biological Engineers Annual International Meeting 2011, ASABE 2011
PB - American Society of Agricultural and Biological Engineers
T2 - American Society of Agricultural and Biological Engineers Annual International Meeting 2011
Y2 - 7 August 2011 through 10 August 2011
ER -