A spreader for solid manure and other particulate material includes upright rotational beaters having paddles to dispense product from the rear of a wagon onto an agricultural field. The paddles on the beaters overlap along a midpoint between the beaters to improve product distribution on the field. The perimeter edges of the paddles are in close proximity to the side edges of the beater frame to facilitate product sheer, and thus improved distribution. The paddles on each beater are vertically and radially offset, and at least some of the paddles are spring-loaded.