Abstract: A spreader for widely broadcasting agri-chemicals from a conventional airplane. Preferably the spreader comprises a central body comprised of an upper and lower top which diverge away from each other between a central front and a rear. The generally wing-shaped spreader includes a front throat having a mouth in which a plurality of spaced apart vane fronts are disposed. The vanes extend in arcuate spaced-apart relationship throughout the interior of the spreader, terminating in pivoted swallow-tail portions. Each swallow-tail portion includes a pair of pivoted tabs which can be adapted to deflect agri-chemicals in a desired fashion. Preferably the throat includes a releasable plate for quick connecting the spreader to the aeroplane, and a front, lower baffle plate may be adjusted to redirect air flow. Upon the opposite lateral outwardly diverging sides of the body two pairs of cooperating air injection chutes are employed.