A manually operable push-type topdresser includes a reciprocating screen apparatus at the bottom of a material hopper that is operable to reduce the particulate material within the hopper to a uniform size before discharging the particulate material onto the surface of the ground. The topdresser includes a ground drive mechanism to power the reciprocation of an upper screen member when the topdresser is moved. The drive mechanism includes a front drive wheel mounted on one end of an axle and a freely rotatable wheel mounted on the opposing end of the axle to facilitate maneuverability of the topdresser in tight spaces. The reciprocation of the upper screen prevents bridging of the particulate material within the hopper. A control linkage shifts the ground drive mechanism between operable and inoperable modes by moving a shift collar to control engagement of the reciprocation drive with a cam member rotatable with the drive wheel.
