A rotary mower apparatus for applying liquid chemical to vegetation has a rotating drive shaft extending downward through the deck, and a plurality of blades extending horizontally from the drive shaft. A blade ring extends downward from a bottom surface of the mower deck and is configured such that a bottom edge of the blade ring is located above a path of a middle portion of the blades, and a plurality of sprayer nozzles extend downward from the bottom surface of the mower deck inside the blade ring. A chemical source is operative to deliver pressurized liquid chemical through the chemical conduits to each sprayer nozzle.