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Agriculture

Heavy Metals in Agricultural Soils in Selected Farm Lands

Bachelors Degree

This project deals on assessing heavy metals present in agricultural soils

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Assessment of agricultural soils for heavy metal contents is of great concern due to potential health implications and safety issues involved in the uptake of the metals by crops on agricultural soils. Heavy metals are metals that have a specific gravity greater than 4.0g/m. This study is aimed at assessing the concentration of heavy metals in agricultural soils of some selected farms in Kwara state. Soil samples were collected from four location (Idofian, Oro, Omu-Aran and Ogbondoroko) and analysed for pH, textural classification and some heavy metals metal contents (Cd, Cr, Pb, Zn, Co, Cu, and Mn) using standard pH meter, hydrometer method and atomic absorption spectrometer (AAS) method respectively. The experiment was carried out extensively following the standard procedure of agricultural practices put in place. The results of the analysis showed that the pH of the soil ranges from slightly acidic to slightly alkaline (5.40 to 7.50). The textural classification of the soils showed that aside of Oro which can be classified as sandy loam other locations have loamy soil. The mean concentrations of the heavy metals ranged from (0 to 7.67 mg/kg) for Cd, Cr, Pb, Zn, Co, Cu, and Mn respectively. The obtained values for respective metal are below the established limit of FAO and WHO. This implies that the heavy metals considered are not of grave concern at present. The correlation analysis showed a strong correlation between the heavy metals and soil pH.

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