Abstract: An agricultural implement which may be pulled by a tractor in an agricultural field for improving soil conditions, provided with the capability to sort rocks according to their sizes whereby rocks of only desired dimension range are crushed, this implement consisting of a frame carried by two wheels, a drawbar assembly for attaching the frame to a tractor, a rock-transporting tilted belt conveyor assembly provided with a ploughshares means, a pair of corrugated crush rollers, a bin for collecting stones of large dimensions, and a hydraulic power system driven by a drive shaft connected to the power take-off of a tractor.