Dr. Gerd Christian Maack

© Uni-Bonn

Scientific assistant at the Institute of Agricultural Engineering Bonn and deputy head of the department of farm animal husbandry.

Research areas

Dr Maack works as an academic senior councillor in research and teaching at the Institute of Agricultural Engineering with a focus on forage harvesting and forage conservation. Before studying agricultural sciences, he completed an apprenticeship as a farmer on arable farms in the Rhineland. After his studies, he completed a doctorate on the topic of "Investigations into storage density in fodder preservation in film tubes". In research work based on this, among other things in cooperation with the CAU Beijing, physical, chemical and microbial influences on silage stability are investigated. The focus here is on model silages from 1.5l jars to 120l drums. Another field of work is the implementation of new research ideas in project applications on various topics.

Curriculum vitae

  • 2000-2002 Professional training as farmer
  • 2002-2006 Study of Agricultural Sciences (University of Bonn)
  • 2006-2009 PhD (Institute for Agricultural Engineering, University of Bonn)
  • Since 2010 Research Associate (Animal Husbandry Technology Department)
  • BAK Federal Working Group Fodder Conservation
  • DLG Working Group Fodder Conservation
  • VDI Society of German Engineers
  • VDL Professional Association for Agriculture, Food and the Environment

Projects/Third-party funds



Prof. Dr. Wolfgang Büscher


Deutsche Forschungsgemeinschaft


  • Alexander J. Schmithausen, Hauke F. Deeken, Katrin Gerlach, Manfred Trimborn, Kirsten Weiß, Wolfgang Büscher & Gerd-Christian Maack (2022) Greenhouse gas formation during the ensiling process of grass and lucerne silage.
    Journal of Environmental Management Volume 304 15 February 2022, 114142
  • Guilin Shan, Wolfgang Buescher, Christian Maack, André Lipski, Victoria Rosner, Andreas Milimonka, Wilfried Berchtold, Ye Wang, David A. Grantz & Yurui Sun A (2021) Multi-Sensor Mini-Bioreactor to Preselect Silage Inoculants by Tracking Metabolic Activity in situ during Fermentation
    Front. Microbiol., 12 August 2021 11:8686
  • Guilin Shan, Wolfgang Buescher, Christian Maack, Gereon Glenz, Andreas Milimonka, Hauke Deeken, David A. Grantz, Ye Wang & Yuriu Sun (2021)
    Multi-Sensor measurement of O², CO² and reheating in triticale silage: An extended approach from aerobic stability to aerobic microbial respiration.
    Biosystems Engineering, Volume 207, Pages 1-11                                                                                                                                                                                          https://www.sciencedirect.com/science/article/pii/S1537511021000908?dgcid=coauthor
  • Guilin Shan, Wolfgang Buescher, Christian Maack, André Lipski, Ismail‑Hakki Acir, Manfred Trimborn, Fabian Kuellmer, Ye Wang, David A. Grantz & Yurui Sun (2021)
    Dual sensor measurement shows that temperature outperforms pH as an early sign of aerobic deterioration in maize silage
    Scientific Reports | (2021) 11:8686                                                                                                                                                                                                                                   https://www.nature.com/articles/s41598-021-88082-1
  • Ehab Mostafa, Philipp Twickler, Alexander Schmithausen, Christian Maack, Abdelkader Ghaly, Wolfgang Buescher (2020)
    Optimisation of dry matter and nutrients in feed rations through use of a near-infrared spectroscopy system mounted on a self-propelled feed mixer
    Animal Production Science, 2020, 2020/11/18, 10.1071/an19306
  • Manuel S. Krommweh, Alexander J. Schmithausen, Hauke F. Deeken, Wolfgang Büscher, Gerd-Christian Maack (2020) A new experimental setup for measuring greenhouse gas and volatile organic compound emissions of silage during the aerobic storage period in a special silage respiration chamber, Environmental Pollution,                                                                                                                                                                                                                                                                                     https://doi.org/10.1016/j.envpol.2020.115513
  • Ehab Mostafa, Maren Roesmann, Christian Maack, Oliver Schmittmann, Wolfgang Büscher (2020) Automated pressure regulation for a silage bagging machine, https://doi.org/10.1016/j.compag.2020.105399

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