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dc.contributorSunohara, Marken_US
dc.contributorTopp, Edwarden_US
dc.contributorGregorich, Edwarden_US
dc.contributorDrury, Craigen_US
dc.contributorGottschall, Natalieen_US
dc.contributorLapen, Daviden_US
dc.creatorNangia, Vinayen_US
dc.identifier.citationVinay Nangia, Mark Sunohara, Edward Topp, Edward Gregorich, Craig Drury, Natalie Gottschall, David Lapen. (15/11/2013). Measuring and modeling the effects of drainage water management on soil greenhouse gas fluxes from corn and soybean fields. Journal of Environmental Management, 129, pp. 652-664.en_US
dc.description.abstractControlled tile drainage can boost crop yields and improve water quality, but it also has the potential to increase GHG emissions. This study compared in-situ chamber-based measures of soil CH4, N2O, and CO2 fluxes for silt loam soil under corn and soybean cropping with conventional tile drainage (UTD) and controlled tile drainage (CTD). A semi-empirical model (NEMIS-NOE) was also used to predict soil N2O fluxes from soils using observed soil data. Observed N2O and CH4 fluxes between UTD and CTD fields during the farming season were not significantly different at 0.05 level. Soils were primarily a sink for CH4 but in some cases a source (sources were associated exclusively with CTD). The average N2O fluxes measured ranged between 0.003 and 0.028 kg N ha 1 day 1. There were some significantly higher (p 0.05) CO2 fluxes associated with CTD relative to UTD during some years of study. Correlation analyses indicated that the shallower the water table, the greater the CO2 fluxes. Higher corn plant C for CTD tended to offset estimated higher CTD CO2 C losses via soil respiration by w100e300 kg C ha 1. There were good fits between observed and predicted (NEMISeNOE) N2O fluxes for corn (R2 ¼ 0.70) and soybean (R2 ¼ 0.53). Predicted N2O fluxes were higher for CTD for approximately 70% of the paired-field study periods suggesting that soil physical factors, such as water-filled pore space, imposed by CTD have potentially strong impacts on net N fluxes. Model predictions of daily cumulative N2O fluxes for the agronomically-active study period for corn-CTD and corn-UTD, as a percentage of total N fertilizer applied, were 3.1% and 2.6%, respectively. For predicted N2O fluxes on basis of yield units, indices were 0.0005 and 0.0004 (kg N kg 1 crop grain yield) for CTD and UTD corn fields, respectively, and 0.0011 and 0.0005 for CTD and UTD soybean fields, respectively.en_US
dc.sourceJournal of Environmental Management;129,(2013) Pagination 652,664en_US
dc.subjectfield soilsen_US
dc.subjectc sequestrationen_US
dc.subjectSoya beanen_US
dc.titleMeasuring and modeling the effects of drainage water management on soil greenhouse gas fluxes from corn and soybean fieldsen_US
dc.typeJournal Articleen_US
cg.creator.idNangia, Vinay: 0000-0001-5148-8614en_US
cg.subject.agrovocnitrous oxideen_US
cg.subject.agrovoccarbon dioxideen_US
cg.contributor.centerInternational Center for Agricultural Research in the Dry Areas - ICARDAen_US
cg.contributor.centerAgriculture and Agri-Food Canada - AAFCen_US
cg.contributor.funderInternational Center for Agricultural Research in the Dry Areas - ICARDAen_US
cg.contributor.projectCommunication and Documentation Information Services (CODIS)en_US
cg.contributor.project-lead-instituteInternational Center for Agricultural Research in the Dry Areas - ICARDAen_US
cg.coverage.regionNorthern Americaen_US
dc.identifier.statusLimited accessen_US

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