The susceptibility of Amaranthus hybridus L. seedlings to spent engine oil was investigated in soil supplemented with concentrations of oil ranging from 1–5 percent v/w. Parameters considered were relative growth rate (RGR), leaf area ratio (LAR), whole plant height, leaf area, leaf number, chlorophyll and protein levels. A relationship was found to exist between the inhibitory effects and the treatment concentrations. After seventy days growth in the treated soils, the mean height and leaf area of plants in soils treated with 5 percent spent engine oil were 27.0±1.25 cm and 5.63±0.36 cm2. These were significantly different (at p=0.05) from the respective values of 41.4±0.8 cm and 13.44±0.22 cm2 for the control plants. Levels of total chlorophyll (per gram fresh weight of leaves) and protein (per gram dry weight of whole plant) were higher in the control plants compared with those grown in oil treated soil. Results obtained from the growth analysis showed the inhibitory effects of spent engine oil on Amaranthus hybridus L.
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Odjegba, V.J., Sadiq, A.O. Effects of spent engine oil on the growth parameters, chlorophyll and protein levels of Amaranthus hybridus L.. The Environmentalist 22, 23–28 (2002). https://doi.org/10.1023/A:1014515924037