there is disclosed a dispensing apparatus which is mounted at the rear of a tractor and which employs two friction wheels mounted on a common frame . the frame is pivotally mounted so that an operator can cause the friction wheels to engage the rear wheels of the tractor . the friction wheels are attached to a rotatable shaft which contains a pulley . when the friction wheels engage the tractor wheels , the pulley rotates and by means of an associated belt , causes rotation of a dispensing cylinder associated with a cannister or hopper containing chemicals to be dispensed . means are provided for adjusting the tension on the belt as well as for engaging said friction wheels in constant contact with the tractor wheels . the apparatus further incorporates a selectively actuated aerator assembly which is used in conjunction with the dispensing apparatus to maintain and perform lawn maintenance services .