HR: 1340h
AN: B53A-0943    [Abstracts]
TI: Factors Affecting Greenhouse Gas Emissions From Rice Agriculture
AU: Shearer, M J
EM: mshearer@pdx.edu
AF: Portland State University, Environmental Sciences & Resources P.O. Box 751, Portland, OR 97207-0751, United States
AU: * Xiong, Z
EM: zhengqin@pdx.edu
AF: Portland State University, Dept. of Physics P.O. Box 751, Portland, OR 97207-0751, United States
AU: Khalil, M K
EM: khalilm@pdx.edu
AF: Portland State University, Dept. of Physics P.O. Box 751, Portland, OR 97207-0751, United States
AB: Experiments have shown that a few factors control the emissions of methane from rice fields. Among the most significant factors are water management and soil amendments. Continuous flooding and organic fertilizers result in the highest emissions of methane while intermittent flooding and use of nitrogen fertilizers produce more nitrous oxide. We measured fluxes of methane and nitrous oxide from tubs planted with rice grown in a greenhouse at Portland State University. We used classical factorial experimental design to calculate interactions between water management, nitrogen fertilizer application, and organic matter (chopped rice straw) for emission of methane and nitrous oxide. We will discuss the results of three years of experiments. This research was supported by the Office of Science (BER), US Department of Energy, Grant No. DE-FG02- 04ER63913.
DE: 0402 Agricultural systems
DE: 0414 Biogeochemical cycles, processes, and modeling (0412, 0793, 1615, 4805, 4912)
DE: 0490 Trace gases
SC: Biogeosciences [B]
MN: 2007 Fall Meeting