A loader wagon with a loading system for gathering stalk material and transporting gathered stalk material into the load carrying box through an infeed passage in the bottom of the load carrying box into the load carrying box. A lower end portion of the front wall is movable between a forward position and a rearward position. The lower end of the front wall in the rearward position is rearward of at least a forward portion of the infeed passage. A shield is connected to a lower end of the front wall along an edge of the shield for moving rearward and forward with the lower end of the front wall. The shield projects forwardly from the lower end of the front wall and closes off the portion of the infeed passage forward of the lower end of the front wall.
