Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.2013.680.685Sphenostylis stenocarpa)]]>IkhajiagbeB. AnoliefoG.O. JolaosoM.A. OshomohE.O. 1220131614The present study comparatively investigated the phytotoxic effects of waste engine oil (WEO)-polluted soil exposed to monitored natural attenuation up to 5 and 14 months respectively. Soil was previously polluted with WEO at 0, 1, 2.5, 5 and 10% w/w oil in soil. Although, there was significant reduction in heavy metal concentration of soil as well as total hydrocarbon contents, performance of Sphenostylis stenocarpa was greatly retarded when sown at 5 months after pollution (MAP), with death of all seedlings except in the control. However, growth and yield performances were significantly (p>0.05) enhanced at 14 MAP. Computation of hazard quotient showed that ecological risk factor initially posed by the presence of heavy metals in the soil at 5 MAP was significantly (p>0.05) reduced to safe levels at 14 MAP.]]>Alexander, M.,19992nd Edn.Amakiri, J.O. and F.A. Onofeghara,1983Zea mays, Abelmoschus esculentus and Capsicum frutescens.]]>1199205Amund, O.O., C.A. Omole, N. Esiobu and E.O. Ugoji,199316568Anoliefo, G.O. and B.O. Edegbai,2000Solanummelongena (L.) and S. incanum (L.).]]>12125Anoliefo, G.O. and D.E. Vwioko,1995Capsicum annum L. and Lycopersicon esculentum Miller.]]>88361364Anoliefo, G.O. and D.E. Vwioko,2001Chromolaena odorata (L) K and R. grown in soil-contaminated with spent lubricating oil.]]>12024APHA,1985Pages: 256Pages: 256Baker, J.M.,197012744Bray, R.H. and L.T. Kurtz,1945593946De Jong, E.,198022187196Ikhajiagbe, B., G.C. Mgbeze, M. Folu and O. Dania,2007Sphenostylis stenocarpa (Hochst ex a. Rich) Harms (African yam bean) to salinity stress II: Yield, yield components and chemical composition.]]>208392Kayode, J., O. Olowoyo and A. Oyedeji,2009Vigna uniguiculata and Zea mays.]]>11519Lehtomaki, M. and S. Niemela,19754126129Marschner, H.,1986pp: 484-496pp: 484-496Nwoko, C.O., P.N. Okeke, O.O. Agwu and I.E. Apkan,2007Phaseolus vulgaris L. in a soil contaminated with spent-engine oil.]]>619221925Odu, C.T.I.,197258201208Osuji, L.C. and I. Nwoye,20072318324Tekalign, T., I. Hague and E.A. Aduayi,19911991Terge, K.,198422530Udo, E.J. and A.A.A. Fayemi,19754537540Vwioko, D.E. and D.S. Fashemi,2005Ricinus communis L. (castor oil) in spent lubricating oil polluted soil.]]>97379