Spatial variability and reclamation of salinity and sodicity in a Kenyan irrigation scheme |
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| Affiliation: | 1. Center for Geographical Information Systems Agricultural University P.O. Box 215 6700 AE Wageningen, The Netherlands;2. National Agricultural Research Laboratories P.O. Box 14733 Nairobi, Kenya;3. Dept. of Soil Science and Geology Agricultural University P.O. Box 37 6700 AA Wageningen, The Netherlands;1. School of Earth Sciences, Addis Ababa University, P.O. Box 1176, Addis Ababa, Ethiopia;2. School of Environmental Science, Addis Ababa University, P.O. Box 1176, Addis Ababa, Ethiopia;1. School of Global Environmental Sustainability, Colorado State University, 108 Johnson Hall, Fort Collins, CO, 80523-1036, USA;2. Korbel School of International Studies, University of Denver, 2201 S. Gaylord Street, 80201, Denver, CO, USA;3. Department of Geography, Ghent University, Krijgslaan 281 S8, 9000, Ghent, Belgium;1. Department of Chemical Technology of Binding Materials, Belarusian State Technological University, Sverdlova, 13a, Minsk 220006, Belarus;2. Department of Chemical Sciences, Bernal Institute, University of Limerick, Limerick V94 T9PX, Ireland;3. Institute of General and Inorganic Chemistry, National Academy of Sciences of Belarus, Surganova 9/1, Minsk 220072, Belarus;4. Science and Research Centre of Functional Nano-Ceramics, National University of Science and Technology “MISIS”, Lenin Av., 4, Moscow 119049, Russia;1. College of Mechanical and Electrical Engineering, Wenzhou University, China;2. School of Management, Wenzhou Business College, China;3. School of Economics and Management, Southwest University, China |
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| Abstract: | Salinity and sodicity of soils are two common problems encountered in the Hola Irrigation Scheme in east Kenya. Both result in poor crop performance and reduced yields. Based upon a detailed survey in a 405 ha area consisting of 45 irrigation blocks, the spatial variability of pH, ECe and ESP was studied. Data obtained were analyzed using geostatistical procedures in a geographical information system. As it turned out, sodicity in the area has a clear spatial structure. Also differences in homogeneity per block were observed. Reclamation will be necessary, mainly because of the sodicity in the area, while salinity is still at an acceptable level for all crops grown and only small amounts of water are needed to maintain these EC levels. This results in varying gypsum requirements for reclamation for different blocks. A Geographical Information System (GIS) was used to handle large amounts of data and to compare the effects of different land use scenarios. |
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