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Several studies have recorded effect of spent lubricant oil pollution on soil properties. This study aims at evaluating the ecology of waste oil pollution and the impact of phytoremediation on soil hydraulic conductivity vis-à-vis some edaphic properties using three leguminous plants; with the objectives of performing field and laboratory study of such contamination and impact of phytoremediation on such properties as soil texture and structure, particle density, bulk density, porosity, organic matter content and total hydrocarbon content and hydraulic conductivity. Using classical and conventional methods to assess the performance of these plant species, result showed a trajectory influence across pollution levels on the soil edaphic properties culminating to decrease in hydraulic conductivity. With the impact of phytoapplication P. pterocarpum had greater particle size (87.73%) of sand, particle density of 2.61 g/cm 3 with significant difference (P=0.05) than C. retusa and L. leucocephala treated soils. A significantly (P=0.05) lower bulk density (0.83 g/cm 3), increased porosity (68%) and reduced organic matter content (2.65%) were recorded in

Background: Several studies have demonstrated the success of phytoremediation and its advantages over conventional physical and biochemical (even engineered transgenics) methods, resulting in its use on many contaminated sites. A direct method for enhancing the effectiveness of phytoremediation is to over express the genes in transgenic plants that are involved in metabolism, uptake and/or transport of specific pollutants. Objective: A screen-house ecological study was carried out to evaluate the remediation potentials of three species of the Fabaceae Family (Peltophorum pterocarpum, Leucaena leucocephala and Crotolaria retusa) for cleaning up soils contaminated with crude oil petroleum hydrocarbons. Result: Enzymatic analysis and hydrocarbon index assessment of the species and the vegetated and non-vegetated soils showed that P. pterocarpum recorded significant (p<0.05) performance over C. retusa and L. leucocephala in the uptake of hydrocarbons (oil and Grease (OG), Total Hydrocarbon Content (THC), organic carbon and organic matter content]. Results showed significant (p<0.05) reduction in enzyme expression and soil hydrocarbon index. C. retusa recorded significant (p<0.05) increase over P. pterocarpum and L. leucocephala in enzyme expression and reduction in foliar hydrocarbon index, with significant (p<0.05) increase in soil hydrocarbon index. Conclusion: Crotolaria retusa can thus be recommended as an integral component of any bioremediation technology package for hydrocarbon polluted terrestrial environment and by it transgenic enhancement of indigenous enzymes.

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