On the other hand,
sewage sludge amended soil has a biodegradation rate of 0.149/day with used-lubricant half-life of 4.65 days. These
biodegradation rates were significantly higher than that of the control soil (0.0915/day) and autoclaved soil
(0.0309/day). As for the microbial counts, cow dung amended soil recorded (69–122)