EVALUATION OF PHYTO-EXTRACTION POTENTIALS AND PERFORMANCE OF FALSE SESAME (CERATOTHECA SESAMOIDES) UNDER INDUCED SOIL POLLUTION BY AUTOMOBILE LUBRICANT IN SAVANNA ECOREGION
Authors: Babajide P.A. *1 , Popoola O.J. 2 , Gbadamosi J. 3 , Oyedele T. A. 4 , Liasu, M.O. 5
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While strategizing towards achieving improved soil fertility for sustainable tropical crop
production, timely application of fertilizers on regular basis alone is not the University of
Technology, Ogbomoso, Oyo State, Nigeria best approach, particularly on polluted soils.
However, seeking for reliable natural, biological and environment friendly means of ensuring
effective riddance of toxic elements or heavy metals from tropical agricultural soils is equally a
worthwhile technology. An open-field potted experiment was conducted during early raining
season of 2016 (March-July), at the Teaching and Research Farms of Oyo State College of
Agriculture and Technology, Igboora, to investigate the effect of spent engine oil polluted soil
conditions on performance and heavy metal accumulation potentials of Ceratotheca sesamoides.
Spent engine oil was applied at different concentrations (0.0ml, 50.0ml, 100.0ml, 150.0ml, and
200.0ml to each pot containing 7kg soil. Four pots per treatments were used. The trial was
arranged in Completely Randomised Design (CRD), replicated three (3) times. Data were
collected on growth parameters (number of leaves, plant height, stem girth, leaf length and leaf
breadth). The data were subjected to analysis of variance (ANOVA) and Duncan Multiple Range
Test (DMRT) was used to the means. Pre and post-cropping soil analyses were carried out, for
determination of nutrient concentrations. Also, after the termination of the experiment, plant
samples were collected from each of the pots for oven-drying followed by determination of
nutrient concentrations (including the heavy metals). Oil pollution significantly affected growth
and heavy metal accumulation of the test-crop. Growth decreases with increasing rate of
lubricant application, while the heavy metal concentrations in the test-crop increased with
increasing concentrations of the applied spent engine oil.