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This study examined microbial population (MP) and heavy metal load in the soil and mango leaf, along Ogbomoso-Oyo road (high traffic density) and Ogbomoso-Ifeodan (low traffic density). Mango leaves (about 3m from the ground) were sampled at three spots (10km intervals) and three distances of 0-10, 10-20 and 20-30m from the edge of the road. Soil was sampled at 0-15 and 15-30cm depth under mango trees. The samples were analyzed for Pb, Cd, Cr, Zn with atomic absorption spectrophotometer and total MP using nutrient media preparations. On the High Traffic Density (HTD) road, 20-30m distance, the soil contained higher amount of Lead (7.71±0.76), Cadmium (8.36±0.59), Chromium (0.48±0.02) and Zinc (5.58±0.37mg/kg). MP was higher at 0-10m with Total microbial count of 10.5±1.46×10 Cfug and Total fungi count of 0.83±0.23×10 Cfug. Microbial population was higher along LTD than HTD road. Mango leaf contained significantly higher metal content along HTD road Pb (4.31), Cd (4.63), Cr (0.03) and Zn (5.04mg/kg) than LTD road. Microbial population was higher at LTD than HTD, and Mango accumulated higher heavy metals at HTD than LTD. Implications of heavy metals and microbial populations on food chain were discussed.

Heavy Metals Accumulation in Soil and Mango Leaf and Their Effects on Soil Microbial Population along Road Sides in Southwest, Nigeria