Abstract: An airborne apparatus for dispensing particulate agricultural materials in precise dosages includes a rotor to uniformly deliver the particulate material from a container carried by the aircraft to a dispensing opening. A blade is provided adjacent the periphery of the rotor. The blade and the periphery of the rotor cooperate to reduce the interference of particulate material with operation of the rotor. A multi-part rotor housing provides adjustability for a variety of particulate materials. Such housing includes an arcuate housing portion and a gate-forming housing portion. The gate-forming housing portion and arcuate housing portion may be hinged to the remainder of the housing and form a dispensing opening. The arcuate housing portion can be adjusted with respect to the periphery of the rotor and can provide a reservoir of adjustable capacity between the dispensing opening and the rotor periphery.