Effect of nitrification and urease inhibitors on nitrous oxide and methane emissions from an oat crop in a volcanic ash soil

Hube, Sara, Alfaro, Marta A., Scheer, Clemens, Brunk, Christian, Ramírez, Luis, Rowlings, David, & Grace, Peter (2016) Effect of nitrification and urease inhibitors on nitrous oxide and methane emissions from an oat crop in a volcanic ash soil. Agriculture, Ecosystems & Environment. (In Press)

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Nitrous oxide (N2O) emissions from the Chilean agricultural sector are primarily associated with the use of nitrogen (N) fertilizers, so that the use of nitrification and urease inhibitors may represent a potential mitigation option. However, their effectiveness in volcanic ash soils with high organic matter is still uncertain. In this study, the effect of Dicyandiamide (DCD) and N-(n-butyl) thiophosphoric triamide (NBPT) on soil N2O and CH4 emissions from an oat crop was determined using a fully automated greenhouse gas measuring system. Three urea treatments were evaluated: 120kg N ha-1, 120kg N ha-1 + DCD and 120 kg N ha-1 + NBPT (n = 3). A zero treatment (-N) was also considered. Annual N2O emissions ranged from 0.36 to 1.00 kg N2O-N ha-1 (P > 0.05) whereas the net uptake of CH4 ranged from 6.72 to 7.00 kg CH4-C ha‐1 (P> 0.05). Increases in N2O emissions were associated with rainfall events, as characteristic of Mediterranean rain fed ecosystems. Soil CH4 uptake did not vary among treatments but had a significant role offsetting N2O emissions, resulting in total emissions ranging from -17.1 to 239.0 kg CO2eq ha-1 (P<0.001). There was no significant effect of DCD or NBPT on average soil mineral N concentration, and total N2O and CH4 emissions. NBPT significantly increased crop yield and crop N uptake by 27% and 33% respectively (P<0.05), resulting in greater N use efficiency. The use of DCD did not increase productive parameters, but resulted in a 35% reduction of the N2O-N emission intensity (P<0.05). The study shows that volcanic ash soils have a relatively low N2O emission potential due to physic-chemical characteristics and that NBPT could be used to increase N use efficiency in crops, while DCD has a potential to reduce N2O losses per unit yield.

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2 citations in Web of Science®
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ID Code: 98687
Item Type: Journal Article
Refereed: Yes
Keywords: Emission factor; NBPT; DCD; Emission intensity; Greenhouse gases
DOI: 10.1016/j.agee.2016.06.040
ISSN: 0167-8809
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 Elsevier B.V.
Deposited On: 07 Sep 2016 00:50
Last Modified: 06 Oct 2016 04:56

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