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See more from this Division: ASA Section: Environmental Quality
See more from this Session: Management Practices and Land-Use Impact on Global Warming Potential and Greenhouse Gas Intensity

Monday, November 16, 2015: 3:30 PM
Minneapolis Convention Center, 102 E

ABSTRACT WITHDRAWN

Abstract:
A small-plot study was conducted at the Canada-Saskatchewan Irrigation Diversification Centre (CSIDC) to assess soil-emitted nitrous oxide (N2O) emissions in irrigated and non-irrigated plots seeded to spring wheat. The CSIDC is situated at Outlook, SK which is in the north-central portion of the semi-arid Northern Great Plains Ecoregion in the Dark Brown Soil Zone. Vented non-steady state flux chambers were utilized and N2O concentrations from headspace samples were determined using gas chromatography. Three different nitrogen (N) fertilizer regimes were implemented. Together with a no N reference treatment, N was applied at a rate of 120 kg ha-1 in the fall (October) or at seeding in the spring (May). Nitrous oxide emissions responded to both fertilizer application and irrigation. N2O emissions in this region are typically high early in the spring due to high soil-water contents following snowmelt. The combination of high soil-water contents and nitrate from fertilizer application the previous fall led to very high emissions in plots receiving fall-applied N during this time period, but lower emissions for the remainder of the year. Emissions in plots receiving spring-applied N had lower emissions following snowmelt, but more intense emissions following fertilizer application. In general, irrigated plots produced higher annual cumulative emissions.

See more from this Division: ASA Section: Environmental Quality
See more from this Session: Management Practices and Land-Use Impact on Global Warming Potential and Greenhouse Gas Intensity

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