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The interaction of two automobile workshop wastes on the growth performance of Vigna unguiculata (L.) and Sphenostylis stenocarpa (Harm) were examined. The crops were grown in soil treated with spent engine oil (SEO) and spent carbide waste (SCW) of different ratios: 0/0, 0ml/150g, 50ml/100g, 100ml/50g and 150ml/0g. 0/0 served as the control (no pollution) experiment. Results showed that interaction of SEO and SCW significantly (P < 0.05) affect the growth parameters (shoot height, stem girth, leaf area, number of leaves, biomass, root length, nodulation and chlorophyll contents) of Vigna unguiculata (L.) and Sphenostylis stenocarpa (Harm). Both crops in the untreated soil developed better than those in the treated soil. Growth reduction in the plants increase with increase in the dosage of SEO and SCW applied. Gross reduction occurred in nodulation level of CP and AYB at 150ml/0g, i.e. soil treated with only SEO. Data from other parameters studied also revealed higher reductions at soil treated with only SEO, followed closely by soil treated with only SCW. The impacts of SEO/SCW interaction at 50ml/100g and 100ml/50g on AYB and CP were less effectual than those at 150ml/0g and 0ml/150g. It therefore implies that gross pollution of SEO as well as SCW produced more negative impact on AYB and CP than mild combine ratios of the pollutants.

iosr journal of environmental science, toxicology and food technology

Impacts of the Interaction of Two Automobile Workshop Wastes on the Growth Performance and Chlorophyll contents of Vigna unguiculata (L.) and Sphenostylis stenocarpa (Harm)