Contamination of soil with toxic substances can degrade its capacity to grow plants. A Randomized Complete Block Design (RCBD) experiment was set up in 2005 and 2006 to evaluate the effect of organic wastes on the physical properties and maize (Zea mays L) yield of spent oil contaminated (SOC) ultisol in Abakaliki South eastern Nigeria. The wastes comprising poultry droppings (PD) and Rice husk...