A pneumatic seed delivery system is provided for use with planter for row-cropplanting an agricultural field in which the pneumatic seed delivery system mayuse highpressure air to accelerate seeds that are singulated from a seed meter tomatch groundspeed when planting. The pneumatic seed delivery system includes an airacceleratorarranged downstream of a release location of the seed meter. The airaccelerator maydefine a pneumatic device such as an air conveyor or air amplifier that mergesa primaryairflow with a controllable supplemental airflow to provide a correspondinglycontrollable combined airflow that carries and accelerates the singulatedseeds so that theseeds can be released with a rearward horizontal seed velocity component thatapproximates a forward ground speed of the planter to reduce seed tumble.
