Author(s): Asgedom, H; Tenuta, M; Flaten, DN; Gao, X; Kebreab, E | Abstract: Soil N O emissions vary with N source. A study was undertaken on a clay soil in the Red River Valley, Manitoba, Canada, to determine the effect of granular N fertilizers and dairy manure on N O emissions from a field cropped to rapeseed (Brassica napus L.) in 2009 and spring wheat (Triticum aestivum L.) in 2010. Treatments included an unamended control, granular urea, controlled-release urea (ESN), stabilized urea (SuperU), and solid dairy manure added at rates to achieve a total of 140 kg available N ha (product plus soil N test). The N fertilizers were broadcast and shallowly incorporated each spring before planting; the manure was broadcast incorporated the previous fall. Nitrous oxide emissions were monitored from planting to freeze in fall and during spring thaw in 2011 using static-vented chambers. In both years, N O emissions occurred within 4 to 5 wk of planting but not in fall after manure application. Area-scale cumulative N O emissions (∑N O, kg N ha ) from planting to freeze were control l ESN = manure l urea = SuperU. Nitrous oxide emission factors were 0.017 kg N O-N kg available N added for urea and SuperU and 0.007 kg N O-N kg available N for ESN. Seventy-eight percent of the variation in ∑N O could be explained by NO intensity, an integration of soil NO concentrations during the study periods. Greater ∑N O were also associated with higher yields. These findings suggest that N release rates, as indicated by NO intensity and yield, determined N O emissions. The results highlight the challenge of meeting crop demand yet reducing N O emissions by selection of an N source. © 2014 by the American Society of Agronomy, 5585 Guilford Road, Madison, WI 53711. All rights reserved. 2 2 2 2 2 2 2 2 3 3 2 3 2 2 -1 -1 -1 -1 - - -
Nitrous Oxide Emissions from a Clay Soil Receiving Granular Urea Formulations and Dairy Manure
Haben Asgedom,M. Tenuta,D. Flaten,Xiaopeng Gao,E. Kebreab
Published 2014 in Agronomy Journal
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2014
- Venue
Agronomy Journal
- Publication date
2014-03-01
- Fields of study
Agricultural and Food Sciences, Environmental Science
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