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

Jamali, Hizbullah, Quayle, Wendy, Scheer, Clemens, & Baldock, Jeff (2016) Mitigation of N2O emissions from surface-irrigated cropping systems using water management and the nitrification inhibitor DMPP. Soil Research, 54(5), pp. 481-493.

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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.

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ID Code: 98688
Item Type: Journal Article
Refereed: Yes
Keywords: irrigation, leaching, nitrogen-15 isotope, nitrous oxide, wheat
DOI: 10.1071/SR15315
ISSN: 1838-675X
Divisions: Current > Schools > School of Earth, Environmental & Biological Sciences
Past > QUT Faculties & Divisions > Faculty of Science and Technology
Current > Institutes > Institute for Future Environments
Copyright Owner: Copyright 2016 CSIRO
Deposited On: 07 Sep 2016 00:31
Last Modified: 07 Sep 2016 23:39

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