Cover Crop Effects on Nitrous Oxide Emissions: Role of Mineralizable Carbon Mitchell, David Castellano, Michael Sawyer, John Pantoja, Jose
dc.contributor.department Agronomy 2020-01-03T17:10:04.000 2020-06-29T23:02:34Z 2020-06-29T23:02:34Z Tue Jan 01 00:00:00 UTC 2013 2013-09-20
dc.description.abstract <p>Nitrous oxide (N<sub>2</sub>O) emission from denitrification in agricultural soils often increases with N fertilizer and soil nitrate (NO<sub>3</sub>) concentrations. Overwintering cover crops in cereal rotations can decrease soil NO<sub>3</sub> concentrations and may decrease N<sub>2</sub>O emissions. However, mineralizable C availability can be a more important control on N<sub>2</sub>O emission than NO<sub>3</sub> concentration in fertilized soils, and cover crop residue provides mineralizable C input. We measured the effect of a winter rye (<em>Secale cereale</em> L.) cover crop on soil N<sub>2</sub>O emissions from a maize (<em>Zea mays</em> L.) cropping system treated with banded N fertilizer at three rates (0, 135, and 225 kg N ha<sup>–1</sup>) in Iowa. In addition, we conducted laboratory incubations to determine if potential N<sub>2</sub>O emissions were limited by mineralizable C or NO<sub>3</sub> at these N rates. The rye cover crop decreased soil NO<sub>3</sub> concentrations at all N rates. Although the cover crop decreased N<sub>2</sub>O emissions when no N fertilizer was applied, it increased N<sub>2</sub>O emissions at an N rate near the economic optimum. In laboratory incubations, N<sub>2</sub>O emissions from soils from fertilizer bands did not increase with added NO<sub>3</sub>, but did increase with added glucose. These results show that mineralizable C availability can control N<sub>2</sub>O emissions, indicating that C from cover crop residue increased N<sub>2</sub>O emissions from fertilizer band soils in the field. Mineralizable C availability should be considered in future evaluations of cover crop effects on N<sub>2</sub>O emissions, especially as cover crops are evaluated as a strategy to mitigate agricultural greenhouse gas emissions.</p>
dc.description.comments <p>This is a manuscript of an article is published as Mitchell DC, Castellano MJ, Sawyer JE, Pantoja JL. 2013. Cover crop effects on nitrous oxide emissions from a maize-based cropping system: Role of carbon inputs.Soil Science Society of America Journal doi:<a href="" target="_blank" title=" Cover Crop Effects on Nitrous Oxide Emissions: Role of Mineralizable Carbon">10.2136/sssaj2013.02.0074</a>. Posted with permission.</p>
dc.format.mimetype application/pdf
dc.identifier archive/
dc.identifier.articleid 1101
dc.identifier.contextkey 8869286
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath agron_pubs/102
dc.language.iso en
dc.source.bitstream archive/|||Fri Jan 14 18:15:53 UTC 2022
dc.subject.disciplines Agricultural Science
dc.subject.disciplines Agriculture
dc.subject.disciplines Agronomy and Crop Sciences
dc.title Cover Crop Effects on Nitrous Oxide Emissions: Role of Mineralizable Carbon
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isOrgUnitOfPublication fdd5c06c-bdbe-469c-a38e-51e664fece7a
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