PROBLEM TO BE SOLVED: To eliminate a clod, stone, and plant piece such as a stem and leaf adhered on a slat of an endless slat conveyor picking up crops on a surface soil of a farm and to send the endless slat conveyor and drop a small stone and soil reliably.SOLUTION: A pallet circulation conveyor S arranging therein plural pallets Sin a square shape is arranged in a farm work machine G. In a front part of the machine body, an endless slat conveyor Npicking up potatoes and a lift conveyor Nare arranged. In outer peripheral three sides of the pallet circulation conveyor S, three chairs C are arranged and a box installment device H holding a collection box B is arranged in a central lower part. In a middle of the pallet circulation conveyor S, a belt conveyor F is arranged so as to cross obliquely a sending direction of the pallet circulation conveyor S. Press-out members Nare arranged between right/left sprockets Ncontinuously between positions of grooves Nfitted with a slat on an outer periphery of the right/left sprockets in an upper part of the endless slat conveyor.SELECTED DRAWING: Figure 2