It is common in a potato harvester to discard rocks separated from potatoes back on to the field. Some times the rocks are collected in a box and then discarded on to the field. In the case of collected rocks, they are discarded on to the field as soon as the box fills up. Another machine is then necessary to remove the rocks from the field. This method is very inefficient because it increases compaction of the soil by increased traffic over the soil. This invention, relates to a machine that mounted on a potato harvester will crush the rocks separated by the harvester from potatoes, regardless of their hardness and then discard the crushed rocks. This feature improves the condition of the soil by reducing traffic over the field. The machine can be driven by a drive shaft connected to the power take-off of a tractor or a diesel engine. Since this light-weight machine with an engine can be transferred to any work site it can be used for other applications.
