Mitigating N2O emissions from cropping systems after conversion from pasture − a modelling approach

Mielenz, Henrike; Thorburn, Peter J.; Harris, Robert H.; Grace, Peter R.; Officer, S. J.

doi:10.1016/j.eja.2016.06.007

Cited by 16 publications

(12 citation statements)

References 57 publications

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“…Although nitrification inhibitors such as 3,4-dimethylpyrazole phosphate (DMPP) and dicyandiamide (DCD) have reduced N 2 O emissions in subtropical (De Antoni Migliorati et al 2014) and temperate (Harris et al 2013) environments, their current high cost and negligible yield improvement provide limited financial incentive for on-farm adoption (Harris et al 2013). No clear differences in N 2 O emissions have been found between tilled and untilled treatments (Li et al 2016;Mielenz et al 2016a). In subtropical Australia, N 2 O emissions from unfertilised N-fixing legumes were significantly lower than from fertilised crops such as canola (Schwenke et al 2015).…”

Section: Introductionmentioning

confidence: 94%

“…Parameterisations of APSIM for Kingaroy, Kingsthorpe and Hamilton used in the present study have been described previously by Mielenz et al (2016aMielenz et al ( , 2016b), but are briefly described here again.…”

Section: Model Parameterisation and Initialisationmentioning

confidence: 99%

“…Higher emissions (up to 45 kg N ha -1 year -1 ) have been found in experiments conducted in wheat and canola crops after conversion from pasture to cropping (Harris et al 2013;Mielenz et al 2016a) or in irrigated maize and barley (Wallace et al 2015) in south-eastern Australia. In general, N 2 O emissions have been found to be higher in grain systems in subtropical and temperate zones of eastern Australia (Wang et al 2011;Scheer et al 2012;De Antoni Migliorati et al 2014;Jamali et al 2015;Schwenke et al 2015) compared with the particularly low N 2 O emissions measured in semi-arid rain-fed grain cropping in south-eastern and south-western Australia (Barker-Reid et al 2005;Barton et al 2008Barton et al , 2010Barton et al , 2013.…”

Section: Introductionmentioning

confidence: 99%

“…During 2010 and 2011, N 2 O emissions were monitored for 1 year during wheat and fallow after conversion from long-term improved pasture to cropland on adjacent plots (Mielenz et al 2016a). Soils had been under long-term pasture, consisting of subterranean clover (Trifolium subterraneum L.) and perennial ryegrass (Lolium perenne L.).…”

Section: Hamiltonmentioning

confidence: 99%

“…The APSIM-Manager module allows specification of flexible management options, such as crop and residue management, tillage, fertilisation and irrigation, and the implementation of crop rotations. Therefore, APSIM has been used extensively to explore options for climate change mitigation and adaptation, as well as food security Holzworth et al 2015), including N 2 O emissions Mielenz et al 2016aMielenz et al , 2016b.…”

Section: Model Descriptionmentioning

confidence: 99%

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Nitrous oxide emissions from grain production systems across a wide range of environmental conditions in eastern Australia

et al. 2016

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Abstract. Nitrous oxide (N 2 O) emissions from Australian grain cropping systems are highly variable due to the large variations in soil and climate conditions and management practices under which crops are grown. Agricultural soils contribute 55% of national N 2 O emissions, and therefore mitigation of these emissions is important. In the present study, we explored N 2 O emissions, yield and emissions intensity in a range of management practices in grain crops across eastern Australia with the Agricultural Production Systems sIMulator (APSIM). The model was initially evaluated against experiments conducted at six field sites across major grain-growing regions in eastern Australia. Measured yields for all crops used in the experiments (wheat, barley, sorghum, maize, cotton, canola and chickpea) and seasonal N 2 O emissions were satisfactorily predicted with R 2 = 0.93 and R 2 = 0.91 respectively. As expected, N 2 O emissions and emissions intensity increased with increasing nitrogen (N) fertiliser input, whereas crop yields increased until a yield plateau was reached at a site-and crop-specific N rate. The mitigation potential of splitting N fertiliser application depended on the climate conditions and was found to be relevant only in the southern grain-growing region, where most rainfall occurs during the cropping season. Growing grain legumes in rotation with cereal crops has great potential to reduce mineral N fertiliser requirements and so N 2 O emissions. In general, N management strategies that maximise yields and increase N use efficiency showed the greatest promise for N 2 O mitigation.

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