413-8 N2O and CO2 Fluxes from Soil Under Corn (Zea mays L) Production Systems.

Poster Number 409

See more from this Division: ASA Section: Environmental Quality
See more from this Session: Agronomic Practices: Influence on Environmental Quality: II

Wednesday, November 18, 2015
Minneapolis Convention Center, Exhibit Hall BC

Samuel Dennis, 3500 John Merritt Blvd, Tennessee State University, Nashville, TN, Qi Deng, Tenn State University, Nashville, TN, Dafeng Hui, Department of Biological Sciences, Tennessee State University, Nashville, TN and Juming Wang, Climate and Atmospheric Sciences Section, Illinois State Water Survey, Prairie Research Institute, University of Illinois at Urbana-Champaign, Urbana-Champaign, IL
Abstract:
Agricultural soils have the tendency to release N2O and CO2, into the atmosphere as greenhouse gasses. The mitigation of greenhouse gas (GHG) emissions from agricultural soils is still unclear. Therefore we conducted a three-year (2012-2014) field scale study at Tennessee State University Agricultural Research and Demonstration center to evaluate the effects of agricultural management practices on N2O and CO2  fluxes from soil. Corn was used as the test crop. Six URAN liquid fertilizer treatments were applied as follows:  1) URAN, two applications; 2)  URAN, four applications; 3) URAN + denitrification inhibitor; 4) URAN + chicken litter in no-till plots; 5) URAN  in  conventional plots and 6)  URAN + biochar. Each soil treatment was replicated four times. Soil N2O and CO2 fluxes were measured 2-5 times a month during the corn growing season using closed chamber method and soil moisture and temperature was taken in-situ during the measurements. Our data indicate that N2O and CO2 fluxes exhibit significant seasonal variation during the experimental period. The seasonal dynamics of soil CO2 flux was primarily controlled by soil temperature; while soil N2O flux was controlled by soil moisture. N2O and CO2 fluxes were significantly influenced by the agricultural practices. Variation in N2O emission among the treatments was positively correlated with soil moisture.

See more from this Division: ASA Section: Environmental Quality
See more from this Session: Agronomic Practices: Influence on Environmental Quality: II