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30 March 2016 Soil-surface carbon dioxide emission following nitrogen fertilization in corn
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Improvement in use efficiency of N fertilizers can potentially better sustain agriculture by reducing N2O emissions from soils, but little is known about its impact on soil CO2 emissions. A study, involving both a field experiment and a laboratory incubation, was conducted in eastern Canada to determine the N fertilization effect on soil CO2 emissions. In laboratory, we incubated nine different types of soil with and without 150 kg N ha-1 as KNO3 or (NH4)2SO4. The N-fertilized soils had lower CO2 emissions compared with the no-N control soils for six of them. Among fertilizer sources, emissions of CO2 were on average 22% lower with KNO3 than with (NH4)2SO4. The field experiment conducted on a clay soil included three sources of N (urea-NH4NO3, CaNH4NO3, and aqua NH3) at 0-200 kg N ha-1 band-incorporated at the six-leaf corn stage. Under field conditions, most CO2 was emitted between N application and grain maturity with cumulative seasonal soil emissions greater in the control (4.9 Mg C ha-1) than in the N treatments (average of 4.0 ± 0.3 Mg C ha-1). Evidence suggested that both heterotrophic and autotrophic respiration seemed affected, whereas the NO3-based source had a more depressing effect on CO2 emissions than did the NH4 source.

© Her Majesty the Queen in right of Canada 2016. Permission for reuse (free in most cases) can be obtained from RightsLink.
Bernard Gagnon, Noura Ziadi, Philippe Rochette, Martin H. Chantigny, Denis A. Angers, Normand Bertrand , and Ward N. Smith "Soil-surface carbon dioxide emission following nitrogen fertilization in corn," Canadian Journal of Soil Science 96(2), 219-232, (30 March 2016).
Received: 3 June 2015; Accepted: 1 March 2016; Published: 30 March 2016

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