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Mitigation of N₂O emissions from surface-irrigated cropping systems using water management and the nitrification inhibitor DMPP

Jamali, Hizbullah, Quayle, Wendy, Scheer, Clemens and Baldock, Jeff 2016, Mitigation of N₂O emissions from surface-irrigated cropping systems using water management and the nitrification inhibitor DMPP, Soil research, vol. 54, no. 5, pp. 481-493, doi: 10.1071/SR15315.

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Title Mitigation of N₂O emissions from surface-irrigated cropping systems using water management and the nitrification inhibitor DMPP
Author(s) Jamali, Hizbullah
Quayle, WendyORCID iD for Quayle, Wendy orcid.org/0000-0003-0622-1915
Scheer, Clemens
Baldock, Jeff
Journal name Soil research
Volume number 54
Issue number 5
Start page 481
End page 493
Total pages 13
Publisher CSIRO Publishing
Place of publication Clayton, Vic.
Publication date 2016
ISSN 1838-675X
1838-6768
Keyword(s) irrigation
leaching
nitrogen-15 isotope
nitrous oxide
wheat
Science & Technology
Life Sciences & Biomedicine
Soil Science
Agriculture
Summary Soils under irrigated agriculture are a significant source of nitrous oxide (N2O) owing to high inputs of nitrogen (N) fertiliser and water. This study investigated the potential for N2O mitigation by manipulating the soil moisture deficit through irrigation scheduling in combination with, and in comparison to, using the nitrification inhibitor, 3,4-dimethylpyrazole phosphate (DMPP). Lysimeter cores planted with wheat were fitted with automated chambers for continuous measurements of N2O fluxes. Treatments included conventional irrigation (CONV), reduced deficit irrigation (RED), CONV-DMPP and RED-DMPP. The total seasonal volume of irrigation water applied was constant for all treatments but the timing and quantity in individual irrigation applications varied among treatments. 15N-labelled urea was used to track the source of N2O emissions and plant N uptake. The majority of N2O emissions occurred immediately after irrigations began on 1 September 2014. Applying RED and DMPP individually slightly decreased N2O emissions but when applied in combination (RED-DMPP) the greatest reductions in N2O emissions were observed. There was no effect of treatments on plant N uptake, 15N recovery or yield possibly because the system was not N limited. Half of the plant N and 53% to 87% of N2O was derived from non-fertiliser sources in soil, highlighting the opportunity to further exploit this valuable N pool.
Language eng
DOI 10.1071/SR15315
Field of Research 070302 Agronomy
070108 Sustainable Agricultural Development
Socio Economic Objective 970107 Expanding Knowledge in the Agricultural and Veterinary Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, CSIRO
Persistent URL http://hdl.handle.net/10536/DRO/DU:30089677

Document type: Journal Article
Collection: School of Life and Environmental Sciences
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