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Title: Greenhouse gas emission reductions in subtropical cereal-based cropping sequences using legumes, DMPP-coated urea and split timings of urea application
Contributor(s): Schwenke, Graeme D  (author)orcid ; Brock, Philippa M (author); Haigh, Bruce M (author); Herridge, David F  (author)orcid 
Publication Date: 2018
Early Online Version: 2018-10-04
DOI: 10.1071/SR18108
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Abstract: To contribute to national greenhouse gas emissions (GHG) reduction targets, grain growers need strategies that minimise emissions associated with grain production. We used life cycle assessments (LCAs) with field-measured production inputs, grain yields and proteins, legume nitrogen (N₂) fixation, and soil nitrous oxide (N₂O) and methane (CH4) emissions, to explore mitigation strategies in 3-year crop sequences in subtropical Australia. The sequences were: canola plus 80 kg/ha fertiliser nitrogen (80N)-wheat 85N-barley 65N (CaNWtNBaN), chickpea 0N-wheat 85N-barley 5N (CpWtNBa), chickpea 0N-wheat 5N-chickpea 5N (CpWtCp), and chickpea 0N-sorghum 45N (CpSgN). We also assessed the impacts of split fertiliser N application and urea coated with DMPP, a nitrification inhibitor, on the LCA for the CaNWtNBaN sequence. Total pre-farm plus on-farm GHG emissions varied between 915 CO₂-e/ha (CpSgN) and 1890 CO₂-e/ha (CaNWtNBaN). Cumulative N₂O emitted over the 3-year study varied between 0.479kg N₂O-N/ha (CpWtCp) and 1.400 kg N₂O-N/ha (CaNWtNBaN), which constituted 24-44% of total GHG emissions. Fertiliser production accounted for 20% (CpSgN) to 30% (CaNWtNBaN) of total emissions. An extra 4.7 kg CO₂-e/ha was emitted for each additional kg N/ha of applied N fertiliser. Three-year CH4 emissions ranged from 1.04 to 0.98 kg CH4-C/ha. Split N and DMPP strategies could reduce total GHG emissions of CaNWtNBaN by 17 and 28% respectively. Results of the study indicate considerable scope for reducing the carbon footprint of subtropical, dryland grains cropping in Australia.
Publication Type: Journal Article
Source of Publication: Soil Research, 56(7), p. 724-736
Publisher: CSIRO Publishing
Place of Publication: Australia
ISSN: 1838-675X
Field of Research (FOR): 070306 Crop and Pasture Nutrition
050303 Soil Biology
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
Appears in Collections:Journal Article
School of Humanities, Arts and Social Sciences

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