A belt conveyor system for the transporting of plant containers over a cultivation floor including an endless belt on which the plant containers are adapted to be placed, a mobile unit, provided with a buffer which is adapted to buffer the endless belt, and a drive unit to place the endless belt in operation, a reversal device provided with a reversal member, which reversal device is adapted to be placed on the field of the cultivation floor at a distance from the mobile unit； and a temporarily arranged belt guide which is adapted to be placed between the mobile unit and the reversal device on the field of the cultivation floor； wherein the reversal device turns the belt, and wherein the belt runs between the mobile unit and the reversal device across the belt guide.
