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Effect of Diesel Oil Polluted Soil on Proximate Compositions and Mineral Elements of Scent Leaf (Occimum Gratisimum) in AkwaIbom State, Nigeria

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Author Affiliations

  • 1Dept. of Biological Sciences, AkwaIbom State University, Ikot Akpaden, MkpatEnin Local Government Area, AkwaIbom State, NIGERIA
  • 2 Department of Forestry and Environmental Management, Michael Okpara University, Umudike, Abia State, NIGERIA
  • 3 Department of Forestry and Wildlife Resources Management, University of Calabar, Calabar

Int. Res. J. Environment Sci., Volume 3, Issue (9), Pages 32-36, September,22 (2014)

Abstract

Studies of effect in diesel oil pollution on proximate compositions and mineral nutrients in the leaves of Occimumgratissimum were investigated. Five levels (0ml, 75ml, 150ml, 225ml and 300ml) of diesel oil pollution were mixed with 5kg of soil. Each treatment was replicated three times. Plant samples were watered daily for 16 weeks (four months). At the end of 16 weeks, the leave samples were harvested for laboratory analysis. The proximate compositions and mineral nutrients of the leave samples were determined. The results revealed that mean percentage protein(1.57±0.02), fats (0.95±0.02), Ash (0.74±0.25),fibre (1.03±0.03) content and carbohydrate (4.15±0.25) of leave samples were significantly (P<0.05) lower in (300ml) treatment of diesel pollution compare to the corresponding values protein (18.30±0.01), crude fat(22.17±0.13), total ash( 12.05±0.07), crude fibre ( 9.16±0.15) and carbohydrate ( 47.01±0.04) recorded in the (0ml) control experiment respectively. The percentage moisture and dry matter contents were significantly high (P<0.05) in control (0ml) experiment (62.15%, 47.07%) respectively. Treatment with 300ml and 2250ml of diesel oil pollution recorded the least values of moisture and dry matter contents in the leave samples. The mineral nutrientsCa, P, K, Mg, Na, Fe and Zn were also found to reduce significantly as the level of diesel oil pollution increased in the soil compare to values recorded in control experiment (0ml). It is recommended that remediation of diesel oil polluted soil should be carried out before any agricultural activities is carried out in the area.

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