Journal cover Journal topic
SOIL An interactive open-access journal of the European Geosciences Union
SOIL, 4, 47-62, 2018
https://doi.org/10.5194/soil-4-47-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 3.0 License.
Original research article
07 Feb 2018
Local soil quality assessment of north-central Namibia: integrating farmers' and technical knowledge
Brice Prudat, Lena Bloemertz, and Nikolaus J. Kuhn Physical Geography and Environmental Change, University of Basel, Basel, 4000, Switzerland
Abstract. Soil degradation is a major threat for farmers of semi-arid north-central Namibia. Soil conservation practices can be promoted by the development of soil quality (SQ) evaluation toolboxes that provide ways to evaluate soil degradation. However, such toolboxes must be adapted to local conditions to reach farmers. Based on qualitative (interviews and soil descriptions) and quantitative (laboratory analyses) data, we developed a set of SQ indicators relevant for our study area that integrates farmers' field experiences (FFEs) and technical knowledge. We suggest using participatory mapping to delineate soil units (Oshikwanyama soil units, KwSUs) based on FFEs, which highlight mostly soil properties that integrate long-term productivity and soil hydrological characteristics (i.e. internal SQ). The actual SQ evaluation of a location depends on the KwSU described and is thereafter assessed by field soil texture (i.e. chemical fertility potential) and by soil colour shade (i.e. SOC status). This three-level information aims to reveal SQ improvement potential by comparing, for any location, (a) estimated clay content against median clay content (specific to KwSU) and (b) soil organic status against calculated optimal values (depends on clay content). The combination of farmers' and technical assessment cumulates advantages of both systems of knowledge, namely the integrated long-term knowledge of the farmers and a short- and medium-term SQ status assessment. The toolbox is a suggestion for evaluating SQ and aims to help farmers, rural development planners and researchers from all fields of studies understanding SQ issues in north-central Namibia. This suggested SQ toolbox is adapted to a restricted area of north-central Namibia, but similar tools could be developed in most areas where small-scale agriculture prevails.

Citation: Prudat, B., Bloemertz, L., and Kuhn, N. J.: Local soil quality assessment of north-central Namibia: integrating farmers' and technical knowledge, SOIL, 4, 47-62, https://doi.org/10.5194/soil-4-47-2018, 2018.
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Short summary
Soil degradation is a major threat for farmers of semi-arid north-central Namibia. Having tools to assess soil quality is important to evaluate soil conditions and helps targeting important issues. We developed a soil evaluation toolbox that integrates farmers' field experiences and technical knowledge. The combination of local soil descriptions, field soil texture evaluation and soil colour provides locally meaningful information that reveals soil quality improvement potentials.
Soil degradation is a major threat for farmers of semi-arid north-central Namibia. Having tools...
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