Abstract: A compost curing system utilizing a compost turner of generally V-shaped configuration, one leg of the "V" being formed by counter-rotating ribbon augers and the other leg of the "V" being formed by pair of over-under conveyors, the lower conveyor being adjustably extendable to vary the throw of the conveyor system. The legs of the "V" are piviotally interconnected to permit their angular adjustment and are pivotally mounted on a frame structure for attachment to a motorized conveyance. The system includes means for injecting air into compost undergoing treatment and air collection and air treatment apparatus for controlling the temperature of process air emanating from the compost pile for reuse and for deodorizing the air prior to its release to the atmosphere.