A header assembly for an agricultural combine harvester includes a plurality of row units, and a plurality of chopper/blower units. Each chopper/blower unit is positioned below a respective row unit and has a discharge outlet. At least two of the chopper/blower units have a discharge chute connected with the discharge outlet, and a deflector positioned at a discharge end of the discharge chute. Each deflector is independently adjustable to direct crop material toward a windrow formed under the combine harvester.