Authors: Okenna Obi-Njoku,
Published in: CSBE-SCGAB Technical Conferences » 5th CIGR and AGM Quebec City 2021 » Regular Sessions
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Description: Country-specific emission factors (EF) are often used to account for nationwide nitrous oxide (N2O) emissions from nitrogen-fertilized farmlands. Currently, the Canadian EF method does not account for biosolids-induced N2O emissions despite the increasing use of biosolids on Canadian farmlands, due to sparse empirical data across Canada?s ecozones. In this paper, the Canadian EF method was tested against measured N2O emissions from farmlands receiving three different types of biosolids in Quebec (humid continental), Nova Scotia (pacific maritime), and Alberta (semi-arid prairie) between 2017 and 2019. The farmlands in Quebec and Nova Scotia received a total of ~210 kg N ha-1, while the farmlands in Edmonton received a total of ~192 kg N ha-1 for the fertilized treatments. The target N were supplied either by mesophilic anaerobically digested biosolids, composted biosolids, alkaline-treated biosolids, urea, or a 1:1 combination of biosolids and urea across each site. During the growing season, N2O emissions were periodically measured using manual chambers, aggregated, and compared against emissions estimated using the Canadian EF method. Preliminary results showed that the coefficient of determination (R2) values of 0.23. 0.25, and 0.15 were obtained for Quebec, Nova Scotia, and Alberta, respectively. While R2 = 0.44 for the estimated N2O emissions from composted and alkaline-treated biosolids with, R2 = 0.02 for N2O emissions from treatments receiving mesophilic anaerobically digested biosolids. We intend to further derive a unique EF correction factor for each biosolid before drawing a conclusion on the use of the Canadian EF method for estimating N2O emissions from farmlands receiving biosolids.
Conference name: 5th CIGR International Conference and CSBE-SCGAB AGM 2021, Quebec City,QC, 11-14 May 2021.
Session name: GHG Emissions, Climate Change & Adaptation 1
Publication type: Presentation
Language 1: en
Rights: Canadian Society for Bioengineering