An experiment was conducted in the University of Nigeria Nsukka Teaching and Research Farm to determine the effect of spent auto-engine oil on soil and soybean in a Randomized Complete Block Design. Treatments were four levels (0, 1, 2 and 3 %) of spent auto-engine oil (SPO). Top soil samples were collected at 0, 12, 24 and 36 months and analyzed. Results indicated that infiltration rates in plots under 3 % SPO was reduced from 1.40 cm h -1 in control plots to the lowest value of 0.07 cm h -1 compared to 0.27 cm h -1 in 1 % treatment in the first 12 months. Plots contaminated with 3 % SPO gave the lowest K s values of 6.29, 7.68 and 9.43 cm h -1 in the 12 th , 24 th and 36 th months respectively. Data on plant samples showed that 2 % and 3 % SPO contaminations reduced soybean germination from 99 % (control) to 86 and 68 % respectively in the first cropping season whereas 1 % SPO was observed to significantly increase leaf area, dry matter content and grain yield from control values of 52.

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The soils of the major cocoa growing district of Etung Local Government Area of Cross River State were surveyed using a flexible grid method to assess the suitability of these soils for cocoa production. This study was carried out as part of efforts to revitalize cocoa production in Nigeria. Both the linear and square root parametric models of suitability assessment were used for the evaluation exercise. From the computed values of the current index productivity (1.80 12.75), all the mapping units delineated from the exercise were currently not suitable (N2) for cocoa production. The limiting factors identified include high rainfall (> 2500 mm annually) and relative humidity (65.5% -85%), low fertility (N, P, K, Ca, Mg) resulting from nutrient leaching, low pH (3.45 -1 4.90 in KCl) and cation exchange capacity (1.67 10.75 cmol kg ), and low to toxic concentrations of Fe, Mn, Cu and B in the soils. However, the values of potential productivity index (13.41 -45) suggested that most of the mapping units will be marginally suitable (S3) for cocoa production with adequate application of appropriate fertilizers and suitable soil management practices. This will require a carefully designed fertilizer trial to ascertain the optima fertilizer level, fertilizer types and application methods.

The effects of industrial, agriculture and domestic discharges on the quality of water for irrigation along Asa River located in Ilorin were assessed. In this study, Asa river in which effluent from different industries is discharged was studied for heavy metals (Cu, Pb, Zn and Cd) to ascertain its water quality for irrigation and sediment. Water and sediment samples were collected at four points used for dry season irrigation along the river.

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