effect of nine years of animal waste deposition on profile distribution of heavy metals in abeokuta, south-western nigeria and its implication for environmental quality.uncontrolled deposition of waste from animal farms is a common practice in south-western nigeria, and the presence of heavy metals in soil constitutes environmental and health hazards by polluting the soil, ground water, adjoining streams and rivers. the study investigated the profile distribution of mn, pb, cd, zn, fe, cu, ni and cr in some tropical alfisols in south-western nigeria after nine years disposal of animal wastes. the amount of these metals in the soil horizons was high enough to ca ...200919525105
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