Response of spent auto-engine oil contaminated soil to organic amendments with maize (Zea mays) as test crop. (282)
Keywords:Spent engine oil, soil contamination, organic amendment, soil properties, germination, Ultisol
AbstractA study was conducted in the teaching and research farm of the University of Nigeria, Nsukka to evaluate the applicability of some organic materials as bio-stimulation agents. Spent engine oil (Sp) was the main plot treatment applied at 0 (control), 10,000, 20,000 and 30,000 mg/Kg (‘Sp’/soil) in a single dose whereas sub-plot treatments were control (No Amendment = NA), Palm Oil Mill Effluent (PE), Palm Bunch Refuse (PR) and Cassava Peels (CP) applied at 12 Mg/ha each, per year. Treatments were arranged in a split-plot format in Randomized Complete Block Design (RCBD) with three replications. Results indicated that microbial population in amended plots followed the order PE > CP > PR > NA. The PE amended soils reached a peak of 11-fold reduction in total hydrocarbon content relative to un-amended equivalents. Bio-remediation efficiency reached 111.3 % (highest) in PE treatment compared to 51.3% (least) in PR treatment. Increased ‘Sp’ contamination inhibited maize germination.