Effect of enhanced efficiency fertilisers on nitrous oxide emissions in a sub-tropical cereal cropping system
Clemens Scheer A D , David W. Rowlings A , Massimiliano De Antoni Migliorati A , David W. Lester B , Mike J. Bell C and Peter R. Grace AA Institute for Future Environments, Queensland University of Technology, Brisbane, Qld 4000, Australia.
B Queensland Department of Agriculture and Fisheries, PO Box 2282, Toowoomba, Qld 4350, Australia.
C Queensland Alliance for Agriculture and Food Innovation, School of Crop and Food Sciences, University of Queensland, Gatton, Qld 4343, Australia.
D Corresponding author. Email: clemens.scheer@qut.edu.au
Soil Research 54(5) 544-551 https://doi.org/10.1071/SR15332
Submitted: 10 November 2015 Accepted: 29 February 2016 Published: 6 July 2016
Journal Compilation © CSIRO Publishing 2016 Open Access CC BY-NC-ND
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.
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