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.
|Original language||English (US)|
|Title of host publication||Synergy in Science: Partnering for Solutions|
|State||Published - 2015|