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Soil Greenhouse Gas Emissions Affected by Irrigation, Tillage, Crop Rotation, and Nitrogen Fertilization.

Permanent URL:
http://handle.nal.usda.gov/10113/57809
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Abstract:
Management practices, such as irrigation, tillage, cropping system, and N fertilization, may influence soil greenhouse gas (GHG) emissions. We quantified the effects of irrigation, tillage, crop rotation, and N fertilization on soil CO(2), N(2)O, and CH(4) emissions from March to November, 2008 to 2011 in a Lihen sandy loam in western North Dakota. Treatments were two irrigation practices (irrigated and nonirrigated) and five cropping systems (conventional-tilled malt barley [Hordeum vulgaris L.] with N fertilizer [CT-N], conventional-tilled malt barley with no N fertilizer [CT-C], no-tilled malt barley–pea [Pisum sativum L.] with N fertilizer [NTPN], no-tilled malt barley with N fertilizer [NT-N], and no-tilled malt barley with no N fertilizer [NT-C]). Th e GHG fluxes varied with date of sampling and peaked immediately after precipitation, irrigation, and/or N fertilization events during increased soil temperature. Both CO(2) and N(2)O fluxes were greater in CT-N under the irrigated condition, but CH(4) uptake was greater in NT-PN under the nonirrigated condition than in other treatments. Although tillage and N fertilization increased CO(2) and N(2)O fluxes by 8 to 30%, N fertilization and monocropping reduced CH(4) uptake by 39 to 40%. The NT-PN, regardless of irrigation, might mitigate GHG emissions by reducing CO(2) and N(2)O emissions and increasing CH(4)uptake relative to other treatments. To account for global warming potential for such a practice, information on productions associated with CO(2) emissions along with N(2)O and CH(4) fluxes is needed.
Author(s):
Upendra M. Sainju , William B. Stevens , Thecan Caesar-TonThat , Mark A. Liebig
Subject(s):
Hordeum vulgare , Pisum sativum , barley , carbon dioxide , continuous cropping , conventional tillage , crop rotation , fertilizer application , global warming , greenhouse gas emissions , greenhouse gases , irrigation , malt , methane , nitrogen fertilizers , nitrous oxide , no-tillage , peas , sampling , sandy loam soils , soil temperature , North Dakota
Source:
Journal of Environmental Quality 2012 v.41 no.6
Language:
English
Year:
2012
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
Rights:
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.