Extent and distribution of surface soil acidity in the rainfed areas of Ethiopia

Desta, G and Kassawmar, T and Tadesse, M and Zeleke, G (2021) Extent and distribution of surface soil acidity in the rainfed areas of Ethiopia. Land Degradation & development (TSI). pp. 1-12. ISSN 1099-145X

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The soil acidity level is a key soil characteristic that determines soil nutrient availability, soil microbial activities, and crop growth. This study was carried out to predict the extent and severity of soil acidity based on 109,704 soil pH samples collected from soil laboratories and compiled from various studies. Rainfall, altitude, slope gradient, soil, and land cover were considered to generate multivariate interpolated soil pH surface. The performance of the co–kriging model was found to be satisfactory with a standard error of 0.77, root mean square error of 0.51, and R2 of 0.74. The model estimates showed that 47% of the Country's total area and 45% of the rainfed areas are acidic (pH < 6.5). Out of the total area of the Country, 3.7% (42,264 km2) is found to be extreme to strong acidic (pH < 5.5), 20.7% (236,724 km2) is moderate acidic (5.6 < pH < 6.0), and 22.5% (257,290 km2) is slight acidic (6.0 < pH < 6.5), whereas the respective coverage in the rainfed agricultural areas is found to be 12% (80,732 km2), 18% (120,500 km2), and 14.6% (97,202 km2). As informed by the model results, integrated acid soil management efforts should be given a priority to severe soil acidity areas of western, central, northwestern, and southern parts of the Country. Thus, appropriate integrated land management techniques that enable to reduce soil acidity and halt land degradation should be initiated, informed by the map produced. Regularly updating the extent and distribution of surface and sub-surface soil acidity is recommended in future studies.

Item Type: Article
Divisions: Global Research Program - Resilient Farm and Food Systems
Uncontrolled Keywords: Distribution of soil acidity, Ethiopia, Land degradation, Rainfed agricultural areas, Surface soil acidity
Subjects: Others > Soil
Others > Ethiopia
Depositing User: Mr Ramesh MNR
Date Deposited: 06 Jan 2023 12:12
Last Modified: 06 Jan 2023 12:12
URI: http://oar.icrisat.org/id/eprint/12038
Official URL: https://doi.org/10.1002/ldr.4113
Acknowledgement: The German Federal Ministry for Economic Cooperation and Development (BMZ) funded the GIZ-ISFM project on “Facilitating change in Adoption and Utilization of Soil Fertility Management Interventions in Ethiopia,” which has provided support and staff time to the first author. The soil pH data were obtained from the nine Regional Soil Laboratories located in Southern Nations, Nationalities and People's, Amhara, and Oromia Regional States through the project funded by the World Bank and implemented by the Water and Land Resource Center (WLRC) of Addis Ababa University.
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