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Rosie O'Neill

Postdoctoral Researcher

Research Interests

My research interests lie in the effect of key nutrients on N2O emissions from soils and the establishment of optimum relative abundance ratios to promote nutrient use efficiency. I have a specific interest in the impact of varying phosphorus concentrations on emissions and N-cycling communities as well as a background in isotope tracing analysis to investigate the main N-transformation pathways contributing to N2O emissions.  This research focuses on the relative abundance between key nutrients; carbon, nitrogen and phosphorus to promote maximum nutrient use efficiency and to reduce greenhouse gas emissions. Examining these nutrients and their potential impact on N2O emissions in particular offers a way in which we can increase grass N-uptake while simultaneously reducing N2O emissions, with experiments showing that optimum nutrient abundance can reduce N2O emissions by up to 50% and increase N-uptake by approximately 20%.

Current Projects

I am currently working under the supervision of Dr. Karl Richards on the LABMACC project. This project aims to support the Climate Action Plan to achieve a 51% reduction in national greenhouse gas (GHG) emissions by 2030. Goals outlined in this research include; refining national emissions factors associated with fertiliser application and the evaluation of the economic and mitigation consequences of incorporation of subsequent abatement techniques into production systems.  

  • Land-Use, Agriculture and Bioenergy Measures for the Abatement of Climate Change and inclusion in Marginal Abatement Cost Curve analyses (LABMACC)
  • Manipulation and Integration of Nitrogen Emissions (MINE) evaluating the range of denitrification in Irish agricultural soils


  • 2022 – PhD, School of Biology and Environmental Science, University College Dublin
  • 2017 – BA, (H1) Environmental Science, Trinity College Dublin

Rosie has published many peer reviewed scientific papers.  A full list of her publications can be found on her research gate account.

Rosie's Research Gate account

O’Neill, R. M., Duff, A. M., Brennan, F. P., Gebremichael, A. W., Girkin, N. T., Lanigan, G. J., Krol, D. J., Wall, D. P., Renou-Wilson, F., Müller, C., Richards, K. G. & Deveautour, C. 2022. Linking long-term soil phosphorus management to microbial communities involved in nitrogen reactions. Biology and Fertility of Soils.

Gebremichael, A. W., Wall, D. P., O’Neill, R. M., Krol, D. J., Brennan, F., Lanigan, G. & Richards, K. G. 2022. Effect of contrasting phosphorus levels on nitrous oxide and carbon dioxide emissions from temperate grassland soils. Scientific Reports, 12, 2602.

 O’Neill, R. M., Krol, D. J., Wall, D. P., Lanigan, G. J., Renou-Wilson, F., Jansen-Willems, A. B., Richards, K. G., Müller, C. 2021. Assessing the impact of long-term soil phosphorus on N-transformation pathways using 15N tracing. Soil Biology and Biochemistry, 152, 8.

O’Neill, R. M., Girkin, N. T., Krol, D. J., Wall., D. P., Brennan, F. P., Lanigan, G. J., Renou-Wilson, F. Müller, C., Richards, K. G. , 2020. The effect of carbon availability on N2O emissions is moderated by soil phosphorus. Soil Biology and Biochemistry, 142, 107726.