At harvest, you may discover that weeds have escaped your control efforts and are setting seeds. These escaped weeds can create an even bigger problem next year if they are allowed to add seeds to the soil weed seedbank.
Chaff lining is a strategy in which weed seeds are placed in a narrow (12-inch) line behind the combine, concentrating weed seeds rather than spreading across the whole field.
An inexpensive chaff-lining chute proved to be an efficient method of Harvest Weed Seed Control, placing Palmer amaranth seeds exiting the back of the combine in a narrow line.
See GROW’s summary demonstration in this document: