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| International Agrophysics |
| publisher: | Institute of Agrophysics
Polish Academy of Sciences
Lublin, Poland |
| ISSN: |
0236-8722 |
vol. 21, nr. 1 (2007)
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Estimating trafficability of three Nigerian agricultural soils from shear strength-density-moisture relations
Estimating trafficability of three Nigerian agricultural soils from shear strength-density-moisture relations
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K.O. Adekalu1, D.A. Okunade2, J.A. Osunbitan1
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1 Department of Agricultural Engineering, Obafemi Awolowo University, Ile-Ife, Nigeria |
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2 School of Agriculture, Food and Rural Development, Newcastle University, NE 1 7RU, UK |
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vol. 21 (2007), nr. 1,
pp. 1-5
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abstract
The dry density and shear strength of Iwo (Alfisols), Egbeda (Entisols) and Ondo (Ultisols) soil series in south-western Nigeria were measured at different compaction efforts and moisture contents. Results indicate that dry density and shear strength increased considerably with increase in compactive effort (P < 0.05). Maximum values of dry density were reached at predetermined critical moisture content for compacting the soils, while the strength decreased continuously with increasing moisture content. Superimposing the two curves of dry density and shear strength versus moisture content, respectively, gave the best compromise moisture content for trafficability of the soils. Regression equations were derived to relate the equilibrium moisture content for trafficability of the soils to soil components and dry density.
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keywords
compactive efforts, trafficability, moisture content, shear strength, dry density
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