Effect of Induced pH Change on Overburden Topsoil Nutrient Availability in Bituminous Area of Ondo State, Nigeria
Journal Title: IOSR Journal of Environmental Science, Toxicology and Food Technology (IOSR-JESTFT) - Year 2018, Vol 12, Issue 9
Abstract
In the development of open pit mining scheme for bituminous sand exploitation, one of the primary operations carried out is the stripping operation (the removal and displacement of overburden materials overlying the deposit) including the plant supporting layer of topsoil. This greatly affects the soil chemistry making it unsuitable for vegetative growth. To this effect, this study was carried out to evaluate the effects of induced change in overburden (topsoil) pH on availability of exchangeable bases as indicators for plants nutrients. The study involved collection of topsoil samples from the overburden of bituminous deposit located in Ilubirin - Gbelejuloda axis of Ondo State, Nigeria and leaching with basic (pH 8.5), neutral (pH 7.0) and acidic (pH 4.5) doses of ammonium acetate (NH4OAc). Additionally, the organic matter and nitrogen contents of the samples were also determined. Multivariate statistical analysis of variance (ANOVA) was conducted based on the obtained laboratory data in conjunction with Post Hoc test of multiple comparisons. The statistical analysis (ANOVA) showed that there was a statistically significant difference between each exchangeable cation’s concentrations based on pH of the extractant at (p < 0.05). Post-hoc test further confirmed that Na+ , K + ,Ca2+ concentrations were significantly different, mostly between pH groups pH 4.5 and pH 8.5 at p<0.001; Mg was only slightly different at P<0.05. This implies that the exposure of the topsoil to conditions liable to change the soils’ pH by mining operations will have a serious impairing effect on the cation exchange functionality of the soil to store and supply plants’ essential base metals nutrients.
Authors and Affiliations
Oluwaseyi Eyitayo Ifelola1* ,, Zacheus Olaniyan Opafunso2
Keywords
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