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CAPILLARY MOVEMENT IN COMPACTED SOILS AS INFLUENCED BY ADDED ORGANIC MATERIALS

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  131619219,  2013 Kansas City, Missouri, July 21 - July 24, 2013. (doi: http://dx.doi.org/10.13031/aim.20131619219) @2013
Authors:   J. O. Ohu, E. Mamman, A. A. Mustapha
Keywords:   capillary movement compacted soils.

Abstract. The quantitative effects of incorporating groundnut haulms, cow dung and Chicken dung on capillary movement of compacted sandy loam, clay loam and clay soils were determined in the laboratory.

Measurements were made of the capillary movement of the three soil textures. Groundnut haulms, cow dung and chicken dung were incorporated into the three soils at two different levels (2% and 4%) on dry mass basis. The soil organic matter mixtures were subjected to 0, 5 and 10 levels of compaction using proctor compaction method for determining the capillary movement of the soils. Capillary movement of the three soil-organic mixtures was determined at the optimum moisture content of the soils being compacted.

Capillary movements of the soils were significantly increased by the organic matter levels irrespective of the organic matter type and the compaction level the soils were subjected to. This was due to increase in pore space of the soils with addition and increase in level of the organic matter. Multiple regression equations were developed for predicting the capillary movement for each of the three soil textures. The multiple regression equations developed for the three soils (sandy loam, clay loam and clay soils) separately had r2 – values of 0.99, 0.86 and 0.77, respectively.

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