Nitrous Oxide Emissions from Continuous Winter Wheat in the Southern Great Plains. (1st September 2015)

• Record Type: Journal Article
• Authors: Wilson, Tracy M.; McGowen, Blake; Mullock, Jeremiah; Arnall, D. B.; Warren, Jason G.
• Is Part Of: Agronomy Journal. Volume 107:Number 5(2015)
• Page Start: 1878
• Page End: 1884
• Publication Date: 2015-09-01
• Subjects: Agronomy -- Periodicals; 630
• DOI: 10.2134/agronj15.0096
• Languages: English
• ISSNs: 0002-1962

Abstract

Abstract : Fertilizer‐induced N2 O‐N emissions (the difference between fertilized and unfertilized soils) are estimated to be 0.01 kg N2 O‐N kg −1 of applied N. One approach to limiting N2 O‐N production in soils is by improving nitrogen use efficiency (NUE) in dryland agricultural systems. However, baseline data on the rate of emissions is needed to determine the potential impact that these efforts might have on N2 O‐N concentrations in the atmosphere. A study was established in a long‐term continuous winter wheat ( Triticum aestivum L.) fertility experiment in Stillwater, OK, to determine the effects of N rate on N2 O‐N emissions from a dryland winter wheat–summer fallow system in the southern Great Plains of the United States to fill this knowledge gap. Cumulative emissions of N2 O‐N varied from year to year and were influenced by environment and N rate. Emissions following N fertilizer application were typically highest following N application, as well as toward the end of the summer fallow period, when summer rainfall and temperatures were conducive for N2 O‐N production chambers within plots historically receiving 134 kg N ha −1 annually went unfertilized for the 2012–2013 and 2013–2014 crop years and produced N2 O‐N emissions equivalent to the 45 and 90 kg N ha −1 rate treatments. Annual cumulative emissions ranged from 0.009 to 0.024 kg N2 O‐N kg −1 N applied with an average of 0.015 kg N2 O‐N kg −1 N applied, illustrating the variability in N2 O‐N emissions.