18 Jan 2021
18 Jan 2021
Estimation of soil properties with mid-infrared soil spectroscopy across yam production landscapes in West Africa
- 1Group of Sustainable Agroecosystems, Institute of Agricultural Sciences, ETH Zurich, 8092 Zürich, Switzerland
- 2Department of Agronomy and Medicinal Plant Resources, Gyeongnam National University of Science and Technology, Jinju, Republic of Korea
- 3Group of Plant Nutrition, Institute of Agricultural Sciences, ETH Zurich, 8315 Lindau, Switzerland
- 4World Agroforestry Centre (ICRAF), Côte d’Ivoire Country Programme, BP 2823 Abidjan, Ivory Coast
- 5Centre Suisse de Recherches Scientifiques en Côte d’ivoire, 01 BP 1303 Abidjan, Ivory Coast
- 6Département d’Agrophysiologie des Plantes, Université Peleforo Gon Coulibaly, BP 1328 Korhogo, Ivory Coast
- 7Institut de l’Environnement et Recherches Agricoles, 01 BP 476 Ouagadougou, Burkina Faso
- 8Land Health Decisions, World Agroforestry Centre (ICRAF), Nairobi, Kenya
- 1Group of Sustainable Agroecosystems, Institute of Agricultural Sciences, ETH Zurich, 8092 Zürich, Switzerland
- 2Department of Agronomy and Medicinal Plant Resources, Gyeongnam National University of Science and Technology, Jinju, Republic of Korea
- 3Group of Plant Nutrition, Institute of Agricultural Sciences, ETH Zurich, 8315 Lindau, Switzerland
- 4World Agroforestry Centre (ICRAF), Côte d’Ivoire Country Programme, BP 2823 Abidjan, Ivory Coast
- 5Centre Suisse de Recherches Scientifiques en Côte d’ivoire, 01 BP 1303 Abidjan, Ivory Coast
- 6Département d’Agrophysiologie des Plantes, Université Peleforo Gon Coulibaly, BP 1328 Korhogo, Ivory Coast
- 7Institut de l’Environnement et Recherches Agricoles, 01 BP 476 Ouagadougou, Burkina Faso
- 8Land Health Decisions, World Agroforestry Centre (ICRAF), Nairobi, Kenya
Abstract. Low soil fertility is challenging the sustainable production of staple crops in the yam belt of West Africa. Quantitative soil measures are needed to assess soil fertility decline and to improve crop fertilization management in the region. We developed and tested a mid-infrared (mid-IR) soil spectral library to enable timely and cost-efficient assessments of soil properties. Our collection included 80 soil samples from four landscapes (10 km × 10 km) and 20 fields/landscape across a gradient from humid forest to savanna, and 14 additional samples from one landscape that had been sampled within the Land Health Degradation Framework. We derived partial least square regression models to estimate soil properties with spectra.The models produced accurate cross-validated estimates of total carbon, total nitrogen, total sulfur, total iron, total aluminum, total potassium, total calcium, exchangeable calcium, effective cation exchange capacity, diethylenetriaminepentaacetic acid (DTPA) extractable iron and clay content (R2 > 0.75). The estimates of total zinc, pH, exchangeable magnesium, bioavailable copper and manganese were less predictable (R2 > 0.50). Our results confirm that mid-IR spectroscopy is a reliable and quick method assess the regional-scale variation in most soil properties, especially the ones closely associated with soil organic matter. Although the relatively small mid-IR library shows satisfactory performance, we expect that frequent but small model updates will be needed to adapt the library to the variation of soil quality attributes within individual fields in the regions and their temporal fluctuations.
Philipp Baumann et al.
Status: open (until 19 Mar 2021)
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AC1: 'Comment on soil-2020-100', Philipp Baumann, 20 Jan 2021
reply
This preprint should not contain chemical reference data and model outputs of plant-available Phosphorus (P) derived with the anion exchange resin method (resin extractable P), but the current upload of the manuscript was produced from a previous PDF file that accidentally still contained these data. The reason is that further sampling events and resin P analyses conducted in one of the project regions indicated that more resin membranes were necessary to correctly represent values for soils with rather high extractability of P. There is no modification of the upload possible at the current stage of review since the manuscript has already been posted for interactive discussion. As a precautionary measure, we will hence upload the updated version of the manuscript following the first round of review, which will be without these results and the discussion around it. We apologize for the inconvenience and are looking forward to the feedback of the reviewers and the community.
Philipp Baumann et al.
Data sets
philipp-baumann/yamsys-soilspec-publication: Pre-release of spectral models for the publication of the soil spectral library of the West African yam belt (Version v0.1.0-beta). Zenodo Philipp Baumann https://doi.org/10.5281/zenodo.1174869
Model code and software
philipp-baumann/simplerspec: Beta release simplerspec 0.1.0 for zenodo (Version v0.1.0-beta). Zenodo Philipp Baumann https://doi.org/10.5281/zenodo.3303637
Philipp Baumann et al.
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