An agricultural planter including a frame member, a conveyance system, aseedingsystem and an air pressure differential system. The conveyance system iscoupled to the framemember and the conveyance system allows for the moving of the planter at aground speed. Theseeding system is coupled to the frame member. The air pressure differentialsystem isoperatively coupled to the seeding system. The air pressure differentialsystem includes an airpressure differential producing apparatus for producing an air pressuredifference and acontroller. The controller is in controlling communication with the airpressure differentialproducing apparatus. The controller is configured to select the air pressuredifference dependentupon the ground speed of the planter.
