A bale processor on a wheeled vehicle has a hopper converging inwardly and downwardly to a lower disintegration area at which is located a flail roller rotatable about an axis extending generally along the hopper and including a drive roller or rollers in the hopper for driving rotation of the bale around an axis parallel to the flail roller axis. The processed material is discharged from the disintegration area at the flail roller through an opening in one side wall of the hopper to form a row along that side of the vehicle. A container for particulate material, such as grain, to be added to and mixed with the processed material is carried at the side wall opposite the discharge opening and has an auger tube extending from the container to the hopper at a height below the flail roller and mid way along the side wall so as to introduce the grain into the processed material to mix therewith in the disintegration area.