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ABSTRACT
The study was conducted on soil obtained from selected locations in Ikpoba-Okha Local Government Area of Edo State, Nigeria to determine the physical and chemical properties of the cassava mill effluent contaminated soil and some trace elements present in the contaminated soil. Soil samples were collected using auger sampling from already contaminated soil from five locations at three depths: 0-15cm, 15-30cm, 30-35cm (5x3 factorial) making a total of fifteen samples. The result obtained showed that particle size (sand and silt) except clay ratio decreased significantly with soil depths in all location while clay increased significantly with soil depth. The textural class showed that top soil (0-15 cm) was sand (881.3g/kg, 884.7g/kg, 871.7g/kg, 890.0g/kg and 890.0g/kg) in all locations, while other low depths vary between sand and loamy sand. The soil pH ranged from moderate to slightly acidic (4.70 to 6.43) and decrease with increase in soil depth across all sites. The total nitrogen, organic carbon, available phosphorus, exchangeable base decrease with soil depth but exchangeable acidity increases with soil depth. The highest soil pH value was recorded in site 2, while that of organic carbon available was obtained from site 5. Total nitrogen and Potassium were reported to be higher in site 1, while Magnesium and Calcium was recorded in site 4 and Sodium in site 2. The highest exchangeable acidity was obtained from site 4. The result obtained also showed that the tested trace elements correlated with most of the soil properties both positively and negatively (as in clay). Therefore, cassava effluent has significant effect on soil.
