Publications
Acta Horticulturae Agriculture Agriculture Ecosystems and Environment Animal Production Science Biogeosciences Biology and Fertility of Soils Ecological Applications Ecological Modelling Ecosystems and Environment European Journal of Agronomy Global Change Biology Improved process understanding and new technologies Inhibitors for reducing emissions International Initiative Conference 2016 IOSR Journal of Engineering Nature Scientific Reports Nutrient Cycling in Agroecosystems Plant and Soil Program co-ordination Rapid Communications in Mass Spectrometry Reducing emissions through improved nitrogen use efficiency Science of the Total Environment Scientific Reports Soil Biology and Biochemistry Soil carbon in nitrous oxide emissions Soil Research 50 Soil Research 54 SpringerPlus Urban Ecosystems WIREs Climate Change
2014 |
Migliorati, De Antoni M; Bell, M; Grace, P R; Rowlings, D W; Scheer, C; Strazzabosco, A Assessing agronomic and environmental implications of different N fertilisation strategies in grain cropping systems in Oxisols. Journal Article Nutrient Cycling in Agroecosystems, 100 (3), pp. 369-382, 2014. Abstract | Links | BibTeX | Tags: Nutrient Cycling in Agroecosystems @article{Migliorati2014, title = {Assessing agronomic and environmental implications of different N fertilisation strategies in grain cropping systems in Oxisols.}, author = { M De Antoni Migliorati and M Bell and P. R. Grace and D. W. Rowlings and C Scheer and A. Strazzabosco}, doi = {10.1007/s10705-014-9655-4}, year = {2014}, date = {2014-11-14}, journal = {Nutrient Cycling in Agroecosystems}, volume = {100}, number = {3}, pages = {369-382}, abstract = {A multi-season ^{15}N tracer recovery experiment was conducted on an Oxisol cropped with wheat, maize and sorghum to compare crop N recoveries of different fertilisation strategies and determine the main pathways of N losses that limit N recovery in these agroecosystems. In the wheat and maize seasons, ^{15}N-labelled fertiliser was applied as conventional urea (CONV) and urea coated with a nitrification inhibitor (DMPP). In sorghum, the fate of ^{15}N-labelled urea was monitored in this crop following a legume ley pasture (L70) or a grass ley pasture (G100). The fertiliser N applied to sorghum in the legume-cereal rotation was reduced (70 kg N ha^{−1}) compared to the grass-cereal (100 kg N ha^{−1}) to assess the availability of the N residual from the legume ley pasture. Average crop N recoveries were 73 % (CONV) and 77 % (DMPP) in wheat and 50 % (CONV) and 51 % (DMPP) in maize, while in sorghum were 71 % (L70) and 53 % (G100). Data gathered in this study indicate that the intrinsic physical and chemical conditions of Oxisols can be extremely effective in limiting N losses via deep leaching or denitrification. Elevated crop ^{15}N recoveries can be therefore obtained in subtropical Oxisols using conventional urea while in these agroecosystems DMPP urea has no significant scope to increase fertiliser N recovery in the crop. Overall, introducing a legume phase to limit the fertiliser N requirements of the following cereal crop proved to be the most effective strategy to reduce N losses and increase fertiliser N recovery.}, keywords = {Nutrient Cycling in Agroecosystems}, pubstate = {published}, tppubtype = {article} } A multi-season 15N tracer recovery experiment was conducted on an Oxisol cropped with wheat, maize and sorghum to compare crop N recoveries of different fertilisation strategies and determine the main pathways of N losses that limit N recovery in these agroecosystems. In the wheat and maize seasons, 15N-labelled fertiliser was applied as conventional urea (CONV) and urea coated with a nitrification inhibitor (DMPP). In sorghum, the fate of 15N-labelled urea was monitored in this crop following a legume ley pasture (L70) or a grass ley pasture (G100). The fertiliser N applied to sorghum in the legume-cereal rotation was reduced (70 kg N ha−1) compared to the grass-cereal (100 kg N ha−1) to assess the availability of the N residual from the legume ley pasture. Average crop N recoveries were 73 % (CONV) and 77 % (DMPP) in wheat and 50 % (CONV) and 51 % (DMPP) in maize, while in sorghum were 71 % (L70) and 53 % (G100). Data gathered in this study indicate that the intrinsic physical and chemical conditions of Oxisols can be extremely effective in limiting N losses via deep leaching or denitrification. Elevated crop 15N recoveries can be therefore obtained in subtropical Oxisols using conventional urea while in these agroecosystems DMPP urea has no significant scope to increase fertiliser N recovery in the crop. Overall, introducing a legume phase to limit the fertiliser N requirements of the following cereal crop proved to be the most effective strategy to reduce N losses and increase fertiliser N recovery. |
2012 |
Scheer, C; Grace, P R; Rowlings, D; Payero, J Soil N2O and CO2 emissions from cotton in Australia under varying irrigation management Journal Article Nutrient Cycling in Agroecosystems, 95 , pp. 43-56, 2012. Abstract | Links | BibTeX | Tags: Nutrient Cycling in Agroecosystems @article{Scheer2012, title = {Soil N_{2}O and CO_{2} emissions from cotton in Australia under varying irrigation management}, author = { C Scheer and P. R. Grace and D Rowlings and J. Payero}, doi = {10.1007/s10705-012-9547-4}, year = {2012}, date = {2012-12-15}, journal = {Nutrient Cycling in Agroecosystems}, volume = {95}, pages = {43-56}, abstract = {Irrigation is known to stimulate soil microbial carbon and nitrogen turnover and potentially the emissions of nitrous oxide (N_{2}O) and carbon dioxide (CO_{2}). We conducted a study to evaluate the effect of three different irrigation intensities on soil N_{2}O and CO_{2} fluxes and to determine if irrigation management can be used to mitigate N_{2}O emissions from irrigated cotton on black vertisols in South-Eastern Queensland, Australia. Fluxes were measured over the entire 2009/2010 cotton growing season with a fully automated chamber system that measured emissions on a sub-daily basis. Irrigation intensity had a significant effect on CO_{2} emission. More frequent irrigation stimulated soil respiration and seasonal CO_{2} fluxes ranged from 2.7 to 4.1 Mg-C ha^{−1} for the treatments with the lowest and highest irrigation frequency, respectively. N_{2}O emission happened episodic with highest emissions when heavy rainfall or irrigation coincided with elevated soil mineral N levels and seasonal emissions ranged from 0.80 to 1.07 kg N_{2}O-N ha^{−1} for the different treatments. Emission factors (EF = proportion of N fertilizer emitted as N_{2}O) over the cotton cropping season, uncorrected for background emissions, ranged from 0.40 to 0.53 % of total N applied for the different treatments. There was no significant effect of the different irrigation treatments on soil N_{2}O fluxes because highest emission happened in all treatments following heavy rainfall caused by a series of summer thunderstorms which overrode the effect of the irrigation treatment. However, higher irrigation intensity increased the cotton yield and therefore reduced the N_{2}O intensity (N_{2}O emission per lint yield) of this cropping system. Our data suggest that there is only limited scope to reduce absolute N_{2}O emissions by different irrigation intensities in irrigated cotton systems with summer dominated rainfall. However, the significant impact of the irrigation treatments on the N_{2}O intensity clearly shows that irrigation can easily be used to optimize the N_{2}O intensity of such a system.}, keywords = {Nutrient Cycling in Agroecosystems}, pubstate = {published}, tppubtype = {article} } Irrigation is known to stimulate soil microbial carbon and nitrogen turnover and potentially the emissions of nitrous oxide (N2O) and carbon dioxide (CO2). We conducted a study to evaluate the effect of three different irrigation intensities on soil N2O and CO2 fluxes and to determine if irrigation management can be used to mitigate N2O emissions from irrigated cotton on black vertisols in South-Eastern Queensland, Australia. Fluxes were measured over the entire 2009/2010 cotton growing season with a fully automated chamber system that measured emissions on a sub-daily basis. Irrigation intensity had a significant effect on CO2 emission. More frequent irrigation stimulated soil respiration and seasonal CO2 fluxes ranged from 2.7 to 4.1 Mg-C ha−1 for the treatments with the lowest and highest irrigation frequency, respectively. N2O emission happened episodic with highest emissions when heavy rainfall or irrigation coincided with elevated soil mineral N levels and seasonal emissions ranged from 0.80 to 1.07 kg N2O-N ha−1 for the different treatments. Emission factors (EF = proportion of N fertilizer emitted as N2O) over the cotton cropping season, uncorrected for background emissions, ranged from 0.40 to 0.53 % of total N applied for the different treatments. There was no significant effect of the different irrigation treatments on soil N2O fluxes because highest emission happened in all treatments following heavy rainfall caused by a series of summer thunderstorms which overrode the effect of the irrigation treatment. However, higher irrigation intensity increased the cotton yield and therefore reduced the N2O intensity (N2O emission per lint yield) of this cropping system. Our data suggest that there is only limited scope to reduce absolute N2O emissions by different irrigation intensities in irrigated cotton systems with summer dominated rainfall. However, the significant impact of the irrigation treatments on the N2O intensity clearly shows that irrigation can easily be used to optimize the N2O intensity of such a system. |