341-7 Tillage and Compaction Effects On Greenhouse Gases Emission From Corn-Soybean-Oats Rotation in Ohio.

See more from this Division: S11 Soils & Environmental Quality
See more from this Session: Air Quality and Agriculture: Challenges and Solutions
Wednesday, November 3, 2010: 2:45 PM
Long Beach Convention Center, Seaside Ballroom B, Seaside Level
Share |

David Ussiri, School of Environment and Natural Resources, The Ohio State University, Columbus, OH and Rattan Lal, The Ohio State University, Columbus, OH
Green house gases produced by anthropogenic activities have been linked to the observed and predicted warming trends in global climate. Land management practices, soil properties and climatic factors are major regulators of greenhouse gases from farmland. The study was conducted to investigate the effects of compaction, tillage management and crop rotation on CO2, N2O and CH4 emission on Crosby silt-loam soil in southern Ohio. Three levels of compaction 0, 10 and 20 tons were superimposed on no-till and conventional till management. Crop rotation was corn-soya bean-winter oat. Polyvinyl chloride chambers were installed (15 cm diameter) were installed in each plot in between plant rows. Vented chamber lids, fitted with sampling port were used to close the chambers during sampling and air samples were obtained at 0, 30 and 60 minute intervals and analyzed for CO2, CH4 and N2O concentration by gas chromatography. Gaseous fluxes were measured at 2 to 4 weeks intervals for three years. In addition, soil moisture of the top 10 cm, and soil temperature at 5, 10 and 20 cm soil depth were determined for each sampling date. Significantly higher GHG fluxes were observed in spring (March-June) compared to other seasons of the year. The N2O fluxes from corn were generally higher than from winter oats and soybean during growing period, probably due to N fertilizer application. Generally, annual CH4 and N2O fluxes increased with increase in compaction, but there were no discernable trends with compaction treatments for CO2 fluxes.
See more from this Division: S11 Soils & Environmental Quality
See more from this Session: Air Quality and Agriculture: Challenges and Solutions