104-27 Assessing the Relative Potential of Organic Amendments to Emit Soil N2O : Towards a Standard Method.

Poster Number 980

See more from this Division: S03 Soil Biology & Biochemistry
See more from this Session: Soil Biology and Biochemistry Student Poster Competition
Monday, November 1, 2010
Long Beach Convention Center, Exhibit Hall BC, Lower Level
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Ana´s M. Charles1, Philippe Rochette2, Joann Whalen1, Martin Chantigny2, Denis Angers2 and Normand Bertrand2, (1)Natural Resource Sciences, McGill University, Ste-Anne-de-Bellevue, QC, Canada
(2)Agriculture and Agri-Food Canada, Quebec, QC, Canada
Prediction of N2O emissions following the application of organic amendments to soils is difficult because of their variable composition and of complex interactions with soil properties and conditions. In this study, we propose to determine the Relative Potential of Organic Amendments to produce soil N2O emissions (RPOAN2O). The potential was estimated based on N2O dynamics during laboratory incubation of a clay loam soil at 22°C. Amendments included pig slurry (PS), poultry manure (PM), sheep manure compost (SMC), alfalfa residues (AR), wheat straw residues (WSR), mineral fertilizer (NH4NO3) and an unamended control (CTL). Four incubation methods were used.  In the Dry/Wet method, soil was allowed to dry for 45 d at ambient O2 level, followed by a rewetting. The ISO method consisted of a 45-d incubation at constant soil water content at ambient O2, followed by an anaerobic period under “N2 + C2H2” atmosphere. For the other two methods, the glass jars were sealed and headspace was flushed with N2 (OA-) or “N2 + C2H2” (OA+) when the O2 level in headspace reached 5%. Estimates of RPOAN2O obtained using each incubation method and the relationship between RPOAN2O and chemical properties of amendments will be presented and discussed.
See more from this Division: S03 Soil Biology & Biochemistry
See more from this Session: Soil Biology and Biochemistry Student Poster Competition