What is the fine-grained topic of the following text: We thank Josef Scholz vom Hofe, Christiane Lenz-Kuhl, Jennifer Branch and Simon Kohling for their assistance in the field and in the laboratory, Ralf Schmiede for editing and processing the desiccation crack images, Christian Albrecht for soil classification and Melanie Kühlmann for soil particle size analysis. Only return the topic.
Acknowledgements in a scientific research study