Document Type
Article
Publication Date
1-1-2019
Abstract
Core Ideas: Application of urea led to higher N2O emissions than urea–ammonium nitrate in sugarcane. Residue retention led to higher N2O and CH4 emissions irrespective of N source. Both N source and residue management did not affect CO2 emissions. Sugarcane (Saccharum spp.) is a major row-crop in the southern United States with high rates of N-fertilizer application and unique harvest-residue management. A 2-yr field experiment was conducted to investigate different N-fertilizer effects (urea and urea ammonium nitrate, UAN) and harvest-residue managements (residue-retain, RR, and residue-burn, RB) on greenhouse gas (GHG) emissions from soils under sugarcane production. In 2012, a split-plot design experiment was conducted with residue managements as main-plots and N-sources as sub-plots. In 2013, two experiments were conducted to investigate UAN effect under RR and RB, and N-source effect under RB on GHG emissions. Nitrogen was applied at 135 and 157 kg ha‒1 in 2012 and 2013, respectively. Soil GHG emissions were monitored using a closed chamber method. Results showed the majority of N2O emissions occurred within 4 wk after N-application. Average N2O emissions from urea-treated plots were 1.43 to 1.67 times higher compared with UAN for 2 yr. Urea had a N2O emission factor of 3.52 and 4.45% under RB and RR, respectively, whereas UAN had 1.67 and 2.46% under the same residue management. Higher N2O emission under RR treatment was supported by 15 to 20% more water-filled pore space (WFPS) in soil than RB plots, which also increased CH4 emissions. Higher correlation was found between N2O emission and WFPS in 2012 compared with 2013 (r2 = 0.52 vs. 0.36) because a majority of the rainfall in 2012 was received within 3 wk following N application. Nitrogen sources had no effect on CH4 and CO2 emissions.
Publication Source (Journal or Book title)
Agrosystems, Geosciences and Environment
First Page
1
Last Page
10
Recommended Citation
Dattamudi, S., Wang, J., Dodla, S., Viator, H., DeLaune, R., Hiscox, A., Darapuneni, M., Jeong, C., & Colyer, P. (2019). Greenhouse Gas Emissions as Influenced by Nitrogen Fertilization and Harvest Residue Management in Sugarcane Production. Agrosystems, Geosciences and Environment, 2 (1), 1-10. https://doi.org/10.2134/age2019.03.0014