An agricultural implement including a toolbar, a plurality of row units connected to the toolbar, and a pneumatic seeding system. The pneumatic seeding system includes at least one storage tank configured for storing the particulate matter, a plurality of fluid lines fluidly interconnecting the at least one storage tank with each row unit of the plurality of row units, a fan fluidly connected to the at least one storage tank and to the plurality of fluid lines, and at least one pinch valve fluidly coupled to at least one fluid line of the plurality of fluid lines for adjustably balancing a respective airstream within the at least one fluid line of the plurality of fluid lines.
