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ABSTRACT
A trial was conducted at the Screen House of the Department of Crop Science, University of Benin, Benin City, Nigeria to evaluate the efficacy of using organic fertilizer as bioremediant for spent engine oil polluted soils. The study involves three concentrations of spent engine oil (0, 5 and 10 % contamination) and four liquid organic fertilizer (control (water), cattle dung, rabbit manure and poultry manure). Data were collected on soil physical and chemical properties and after harvesting data were collected on soil chemical properties. Result showed that spent engine oil pollution increased the bulkiness of the soil and increased with increase in the level of pollution. Pollution increased pH, total N2, available P and exchangeable cation, they decrease further with increase in the level of pollution. Spent engine oil pollution increased the organic carbon of the soil and also increased with increase in the level of pollution. The application of liquid organic fertilizer decreased the soil bulkiness. Liquid organic fertilizer application increased soil pH, organic carbon and nutrient content but decreased exchangeable acidity content. After cropping with Amaranth, spent engine oil pollution had depressing effect on pH and nutrient content but increased organic carbon and total hydrocarbon. Liquid organic fertilizer treated containers had improved pH and nutrient content but lower total hydrocarbon.
