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Consequences of crude oil on some indigenous microorganisms and edible plants in Kogi State University demonstration farm, Anyigba, Nigeria

Author Affiliations

  • 1Microbiology Department, Kogi State University, Anyigba, Nigeria

Int. Res. J. Environment Sci., Volume 8, Issue (1), Pages 16-22, January,22 (2019)


Different levels of crude oil were added to soil samples: 2%, 4%, 6% and 8% v/w for 4 weeks and observations were made for the effects of the crude on the indigenous bacterial and fungal populations and also on the dry matter of spinach, maize, tomato and beans crops. The microbial count showed that there was a progressive decrease in the microbial counts of the soil treated samples as shown in tables 2 and 3. Lower microbial counts were observed in the treated samples compared to control. The mean bacterial counts decreased at 2% treatment (2.46 X106) when compared to the control (0%) (2.60 X106) treatment, it slightly increases at 4% treatment to 3.06X106 then, the counts decreased all through the 6 and 8% treatments progressively. The mean fungal counts also had an initial decrease of 3.38X104 and 1.9 X104at both 2% and 4% treatments compared to the control which was 4.6 X104. The mean fungal count tend to increase at 6% (5.86 X104) but it decreased again at 8% (4.08 X104). The crude oil made the soil to be acidic compared to the control; it also made the soil to retain moisture content, thereby becoming water logged and anaerobic in nature; at 28 day, it slightly increased the contents of the organic matter in the treated soil samples. Phytochemical properties present in the plants (alkaloid, phenols, tannin and flavonoid) were affected negatively by the crude oil application. Also, it was observed that the stem dry weight matter, leaves dry weight matter and root dry weight matter reduced as the crude oil concentrations in the soil samples increased.


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