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Assessment of growth of D. bulbifera (L.) on contaminated soil (spent engine oil) and industrial effluent

Author Affiliations

  • 1Department of Biology, Federal University of Technology, Akure, Ondo State, Nigeria
  • 2Department of Biology, Federal University of Technology, Akure, Ondo State, Nigeria

Int. Res. J. Environment Sci., Volume 8, Issue (2), Pages 1-6, April,22 (2019)


Anthropogenic activities such as indiscriminate disposal of wastes have contributed immensely to environmental pollution and therefore hinder the existence of plants and other soil organism dwellers. The effect of soil contaminated with Spent Engine Oil (SEO) and Industrial Effluent (IE) soil on the growth and yield of Dioscorea bulbifera L. was investigated in the screen house. Four levels of concentrations: 0ml/15kg, 75ml/15kg, 225ml/15kg, 375ml/15kg of SEO and effluents from a Cocoa Industry were assessed. Growth of D. bulbifera were assessed by taking the following parameters; sprouting, plant height (cm), leaf area (cm), day of bulbil appearance (days), leaf length (cm), girth length (cm), and the number of leaves produced by D. bulbifera in each treatment. This study showed that SEO and IE in soil have highly significant (P ≤ 0.05) effects on growth and yield of the plants. The germination time increased with increase in treatment concentration, with control having the shortest time of 28 days and 375ml/15kg concentration having longest time of 53 days. The growth of D. bulbifera was delayed as the levels of treatment were increased. The control was signfinicantly different (P ≤ 0.05) from other levels of treatment, having highest height value of 576.67cm while IE had the lowest (179.08cm) at week 16. Control had the highest number of leaves (66.3) while IE had the lowest number (18.67). Likewise in leaf length, control had the highest length of 15.17cm while IE had lowest (9.07cm). In leaf area, control had the largest (141.69(x102) cm2) while the IE had the lowest (14.74(x102) cm2).


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