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Fusion of indigenous knowledge and gamma spectrometry for soil mapping to support knowledge-based extension in Tanzania

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Abstract

Food shortages often threaten central Tanzania. Sustainable action adapted to local environmental conditions is desperately needed. In the framework of the TransSEC project, two food value chains in the Dodoma region of Tanzania were inspected in order to make propositions for improvement , spanning from soil preparation to product consumption. Therefore, soil mapping approaches were required to obtain rapid and reliable information. This would enable local farmers to participate in the development of upgrading strategies and extensionists to develop recommendations that take local soil conditions into account. In this study, a combination of participatory soil mapping and gamma ray spectrometry-assisted transect mapping was applied to establish local soil maps of two villages in the Dodoma region. Participatory mapping included key informant interviews, group discussions and transect walks. Local farmers indicated reference profiles for local soil types. Their gamma radiation signatures delivered base information for further soil exploration and soil unit delineation in the field. Finally, high resolution satellite images were used to establish the village soil maps. This approach allows capture of the major soil differences within a village territory and reduction of the costs of chemical analyses. Challenges were soil unit separation with gamma ray spectrometry due to erosional redistribution processes at the surface, correct translation of specific terms from local tongues as well as variable individual soil knowledge of local participants. Ultimately, the combination of local soil knowledge with innovative scientific mapping yielded quick results with sufficient spatial resolution for extension work.

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Acknowledgements

We thank the German Federal Ministry of Education and Research for funding our research. We are also grateful to Nyika Moses Laizer for field assistance, as well as Elirehema Swai and Aivan Onesmo who always made things work.

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  1. Institute for Soil Science and Land Evaluation, University of Hohenheim, Emil-Wolff-Str. 27, 70599, Stuttgart, Germany

    Nadja Reinhardt & Ludger Herrmann

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  1. Nadja Reinhardt
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  2. Ludger Herrmann
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Correspondence to Nadja Reinhardt.

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Reinhardt, N., Herrmann, L. Fusion of indigenous knowledge and gamma spectrometry for soil mapping to support knowledge-based extension in Tanzania. Food Sec. 9, 1271–1284 (2017). https://doi.org/10.1007/s12571-017-0663-5

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