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Recycling organic residues into effective N and S fertilizers

PhD defence, Monday 11 January 2021, Doline Celine Marie-Jeanne Fontaine

2021.01.11 | Helle Mitzi Thomsen Reichl

Doline Celine Marie-Jeanne Fontaine

During her PhD studies, Doline Fontaine investigated on the recycling of nutrients nitrogen (N) and sulfur (S) from organic residues to fertilize crops. To reduce the consumption of nonrenewable resources while sustaining crop yields and soil fertility, there is a need to find sufficient N and S resources and improve the synchrony between the nutrient availability and the crop demand. Anaerobic digestion can improve N utilization via the use of digestate but also S via the recovery of biogas filter materials. Doline studied how the management of crop residues and cover crops combined with anaerobic digestion increase and improve N and S utilization within the cropping system.

The new research findings contribute to the understanding of how the effective recycling of organic residues substitute significant amount of commercial N and S fertilizers, and hence increase the sustainability of arable cropping systems.


The PhD study was completed at the Department of Agroecology, Faculty of Technical Sciences, Aarhus University.

This summary was prepared by the PhD student.

Time: Monday, 11 January 2021 at 13:00
Place: The PhD defense will be held online. To receive a link to the event, please send an e-mail to Karina Rysholt Christensen; kch@agro.au.dk.
Title of PhD thesis: Management of nitrogen and sulfur in arable cropping systems integrating anaerobic digestion

Contact information: Doline Fontaine, e-mail: doline.fontaine@agro.au.dk , tel.: +45 71840852

Members of the assessment committee:

Privatdozent Dr. Kurt Möller, Institute of Crop Science, Fertilization and Soil Matter Dynamics, University of Hohenheim, Germany

Senior researcher Sissel Hansen, Norwegian Centre for Organic Agriculture, Norway

Professor Mathias Neumann Andersen (chairman), Department of Agroecology, Aarhus University, Denmark

Main supervisor:

Senior researcher Peter Sørensen, Department of Agroecology, Aarhus University, Denmark

Professor Jørgen Eriksen, Department of Agroecology, Aarhus University, Denmark

Senior researcher Henrik Bjarne Møller, Department of Biological and Chemical Engineering - Environmental Technology Engineering, Aarhus University, Denmark

Language: The PhD dissertation will be defended in English

The defense is public.
Due to the coronavirus situation, the PhD thesis will not be available for reading at the offices of the PhD administration. Instead, interested parties may send an e-mail to gradschool.tech@au.dk to receive a digital copy of the PhD thesis. Please note, it may in certain cases be necessary to make an individual arrangement to read the PhD thesis.    

PhD defence
17427 / i43