Effect of enhanced efficiency fertilizers on nitrous oxide emissions in a sub-tropical cereal cropping system

Scheer, Clemens, Rowlings, David W., Migliorati, Massimiliano De Antoni, Lester, David W., Bell, Mike J. and Grace, Peter R. (2016) Effect of enhanced efficiency fertilizers on nitrous oxide emissions in a sub-tropical cereal cropping system. Soil Research, 54 5: 544-551. doi:10.1071/SR15332

Author Scheer, Clemens
Rowlings, David W.
Migliorati, Massimiliano De Antoni
Lester, David W.
Bell, Mike J.
Grace, Peter R.
Title Effect of enhanced efficiency fertilizers on nitrous oxide emissions in a sub-tropical cereal cropping system
Journal name Soil Research   Check publisher's open access policy
ISSN 1838-675X
Publication date 2016-07-06
Sub-type Article (original research)
DOI 10.1071/SR15332
Open Access Status DOI
Volume 54
Issue 5
Start page 544
End page 551
Total pages 8
Place of publication Clayton, VIC, Australia
Publisher CSIRO Publishing
Collection year 2017
Language eng
Formatted abstract
To meet the global food demand in the coming decades, crop yields per unit area must increase. This can only be achieved by a further intensification of existing cropping systems and will require even higher inputs of N fertilisers, which may result in increased losses of nitrous oxide (N2O) from cropped soils. Enhanced efficiency fertilisers (EEFs) have been promoted as a potential strategy to mitigate N2O emissions and improve nitrogen use efficiency (NUE) in cereal cropping systems. However, only limited data are currently available on the use of different EEF products in sub-tropical cereal systems. A field experiment was conducted to investigate the effect of three different EEFs on N2O emissions, NUE and yield in a sub-tropical summer cereal cropping system in Australia. Over an entire year soil N2O fluxes were monitored continuously (3 h sampling frequency) with a fully-automated measuring system. The experimental site was fertilised with different nitrogen (N) fertilisers applied at 170 kg N ha–1, namely conventional urea (Urea), urea with the nitrification inhibitor 3,4-dimethylpyrazole phosphate (DMPP), polymer-coated urea (PCU), and urea with the nitrification inhibitor nitrapyrin (Nitrapyrin). Nitrous oxide emissions were highly episodic and mainly controlled by heavy rainfall events within two months of planting and fertiliser N application. Annual N2O emissions in the four treatments amounted to 2.31, 0.40, 0.69 and 1.58 kg N2O-N ha–1 year–1 for Urea, DMPP, PCU and Nitrapyrin treatments, respectively, while unfertilised plots produced an average of 0.16 kg N2O-N ha–1 year–1. Two of the tested products (DMPP and PCU) were found to be highly effective, decreasing annual N2O losses by 83% and 70%, respectively, but did not affect yield or NUE. This study shows that EEFs have a high potential to decrease N2O emissions from sub-tropical cereal cropping systems. More research is needed to assess if the increased costs of EEFs can be compensated by lower fertiliser application rates and/or yield increases.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ
Additional Notes Online early

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
School of Agriculture and Food Sciences
Queensland Alliance for Agriculture and Food Innovation
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Citation counts: Scopus Citation Count Cited 3 times in Scopus Article | Citations
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Created: Tue, 29 Mar 2016, 16:38:00 EST by Associate Professor Michael Bell on behalf of School of Agriculture and Food Sciences