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Hard-setting behaviour of some structurally weak tropical soils |
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| Authors: | G J Ley C E Mullins and R Lal |
| Institution: | 1 Uyole Agricultural Centre, P.O. Box 400, Mbeya, Tanzania 2 Department of Soil Science, University of Aberdeen, Aberdeen AB9 2UE, Gt. Britain 3 Department of Agronomy, The Ohio State University, Columbus, OH 43210, U.S.A. |
| Abstract: | Some soils set hard on drying and may limit crop productivity. The hard-setting behaviour is influenced by soil properties and management. The objective of this study was to relate physical properties of soils sampled from 3 sites in Nigeria to soil strength or degree of hard-setting and to management. Clearing the vegetation and tillage led to a decrease in organic matter content and wet aggregate stability and increased bulk density leading to an increase in soil strength. The soil strength increased as the water content decreased but the increase was much more marked for mechanized cleared or tilled soils than for the less disturbed treatments of forestry or no-till cropping. |
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