Biodegradation of a simulated landfill leachate in tropical soil of depth 6.5 metres

No Abstract. Journal of Applied Science, Engineering and Technology Vol. 4(2) 2004: 6-1

Effect of compaction cycles on index properties of soils from Western Niger Delta,

Lateritic soils of Western Niger Delta have been classified as immature laterites. Repeated vehicular loading on soils tends to result in deterioration of soil construction qualities. In this study, lateritic soils from the Western Niger Delta were investigated to determine the effects of vehicular loading which was simulated by subjecting the soils to series of repeated laboratory compaction cycles. The engineering index properties were determined after the specified cycles. The results of the study on A-2 and A-7 soil types from the area revealed that there were different degrees of particle breakdown with increasing compaction cycles. The polynomial equation best explains the effects of compaction cycles on the percentage of fines and liquid limit. Different equations have been developed to relate the effects of compaction cycles on percent fines and liquid limit

Factor analysis of soil spatial variability in gully erosion area of southeastern Nigeria: A Case Study of Agulu- Nanka- Oko Area

The effect of soil characteristics on gully development and distribution has made it desirable to determine the spatial variability of its physical and chemical properties. This paper examines the spatial variability of soil properties and factors contributing to the general pattern of variability in Agulu- Nanka- Oko gully complex, Southeastern Nigerian. Five (5) gully locations and nine (9) gully profiles were selected for the investigation. Fifty one (51) soil samples were collected along the gully walls of the profiles. These soil samples were analyzed in the laboratory by standard methods (ASTM and British Standard) for soil index properties and chemical properties. The soil samples were collected at depths between 1.2 meters and 21.3 meters, where there are changes in soil types based on textural characteristics. The data were subjected to descriptive and factor analysis. The results of the statistical analyses show that there were marked contrasts in the level of variability of the soil properties. The coefficient of variation ranged from 1.24% to 47.16%. The factor analysis revealed that the variability of the soil properties is mainly due to four factors namely; chemical properties, moisture content, textural characteristics and organic carbon. Key words: Factor, analysis, spatial, variability, soil, gull