Abstract
The effect crude oil pollution and amendment treatments using decomposed green manure (Calopogonium muconoidesDesvaux andAspilia africana(Person) C.D.Adams) on the growth and neutraceutical (minerals, proximate and vitamins A and C) ofCucurbita maximawere studied. Crude oil polluted soils were obtained by mixing thoroughly 10 kg of sandy-loam soil with 10, 20, 30, 40 and 50 ml of crude oil, 0 ml served as control. The amendment treatment with green manure ofC. muconoidesandA. africanawas carried out by adding the different levels of crude oil polluted soils (10 – 50 ml) with 4 kg of the compost manure. The experimental work was carried out in the green house using plastic buckets. Measurement of selected growth parameters such as percentage germination, vine length, leaf area, internode length, leaf number and petiole length was carried out after nine (9) weeks. The results indicated that crude oil pollution significantly (p=0.05) reduced the growth parameters ofC. maxima. Mineral content, proximate composition and vitamin A and C contents ofC. maximaalso showed pronounced reduction with increase in crude oil concentration. The addition of amendment treatment with green manure ofC. muconoidesandA. africanato ameliorate the impeding condition in the crude oil polluted soil significantly (p=0.05) improved the growth parameters and neutraceutical composition ofC. maximawhen compared to the pollution treatment. This study revealed that crude oil pollution negatively affected the growth and neutraceutical composition and generally the productivity ofC. maxima. From this study, it is evident thatC. muconoidesandA. africanaenhanced the growth and quality ofC. maxima.Therefore,C. muconoidesandA. africanashould be used for effective and efficient bioremediation practices.
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