Journal of Agricultural Chemistry and Environment, 2016, 5, 132-151 Published Online August 2016 in SciRes. http://www.scirp.org/journal/jacen http://dx.doi.org/10.4236/jacen.2016.53015 How to cite this paper: Abdullahi, M.S., Uzairu, A., Okunola, O.J. and Balarabe, M.L. (2016) Seasonal Quality Assessment of Agricultural Soils along the Bank of Tungan Kawo Dam, Kontagora, Nigeria. Journal of Agricultural Chemistry and Environ- ment, 5, 132-151. http://dx.doi.org/10.4236/jacen.2016.53015 Seasonal Quality Assessment of Agricultural Soils along the Bank of Tungan Kawo Dam, Kontagora, Nigeria Musa Sabo Abdullahi 1* , Adamu Uzairu 1 , Oluwole Joshua Okunola 2 , Muhammad Lawal Balarabe 3 1 Department of Chemistry, Ahmadu Bello University, Zaria, Nigeria 2 Department of Applied Chemistry, Federal University, Dutsin-Ma, Nigeria 3 Department of Biological Sciences, Ahmadu Bello University, Zaria, Nigeria Received 30 May 2016; accepted 14 August 2016; published 17 August 2016 Copyright © 2016 by authors and Scientific Research Publishing Inc. This work is licensed under the Creative Commons Attribution International License (CC BY). http://creativecommons.org/licenses/by/4.0/ Abstract This research work studies the impacts of irrigation and other agricultural practices on the soil along the bank of Tungan Kawo dam. The experimental analysis evaluates the soil physicochemi- cal parameters and metal (Cd, Cu, Cr, Ni, Fe, Mn, Pb and Zn) concentrations using sequential ex- tractions. The physicochemical parameters of the soils across the sites indicated values reported for less polluted soils. Also, analysis of total metals in the soils indicated lower concentration of all metals evaluated than recommended standard limits with exception of Cd. The results of sequen- tial extraction of heavy metal in soil sample indicated that all metals were mainly associated with the residual, Fe-MnO and organic bound fractions. The residual fraction has the maximum con- centration of metals especially in cool and dry season for Cr, Cu, Ni, Pb and Zn, whereas only a small fraction of all the heavy metal is extracted in water soluble, exchangeable and carbonate bound fractions. It indicates that the bioavailability index is low. Hence, mobility of the heavy metals by the surrounding plants grown on the soils is low. Keywords Metals, Soils, Sequential, Contamination 1. Introduction Pollution of the environment is an important problem in human’s life that leads to a miserable condition. Envi- * Corresponding author.