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• W2953990055 startingPage "107636" @default.
• W2953990055 abstract "Nitrous oxide (N2O) emissions were measured over 4 fields in Manitoba, Canada, continuously from 2006 to 2016 using the micrometeorological flux-gradient technique. The fields were divided into 2 treatments: 2 fields with a rotation of annual crops (corn, faba bean, spring wheat, rapeseed, barley, spring wheat, corn, soybean, spring wheat, soybean, soybean); while 2 fields had a four-year period with a leguminous perennial crop in the rotation (corn, faba bean, alfalfa/grass, alfalfa/grass, alfalfa/grass, alfalfa/grass, corn, soybean, spring wheat, soybean, soybean). Nitrogen fertilizer was applied according to local practice, and was typically not applied in years when a legume was planted. N2O was emitted from the field in episodes during spring thaw and following nitrogen fertilizer application. Emissions were less during the perennial phase of the comparison (mean 1 kg N ha−1 y−1 from perennial fields; 4.7 kg N ha−1 y−1 from the annual fields; P < 0.001). However, over the 11-year period, the treatments were not different (P = 0.3), averaging 5 kg N ha−1 y−1 because of large emissions of about 20 kg N ha−1 y−1 in the year following termination of the perennial crop. Nitrogen fertilizer application rate explained 69% of the variability in emissions (P < 0.001), with only a marginal advantage including other environmental variables such as soil nitrate exposure or soil ammonium concentrations. The N2O flux data were combined with carbon dioxide flux measurements, fertilizer N manufacturing, and potential product end uses to estimate the net greenhouse gas budget. Net emissions were a source of 1.7 Mg CO2 equivalents ha−1 y−1, driven by 3 Mg CO2 equivalents ha-1 y-1 source from N2O emissions, net carbon exchange of 3 to 5 Mg CO2 equivalents ha-1 y-1 sink, and a consumption source of 6 to 7 Mg CO2 equivalents ha-1 y-1. High inter-annual variability in fluxes resulted in no significant difference (P = 0.87) in overall greenhouse gas emissions between treatments over the full period including N fertilizer inputs and end uses of crop products." @default.
• W2953990055 created "2019-07-12" @default.
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• W2953990055 date "2019-10-01" @default.
• W2953990055 modified "2023-10-18" @default.
• W2953990055 title "Agricultural management practices and environmental drivers of nitrous oxide emissions over a decade for an annual and an annual-perennial crop rotation" @default.
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• W2953990055 doi "https://doi.org/10.1016/j.agrformet.2019.107636" @default.
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