1. Plow apparatus, comprising: a frame, including: two spaced, elongated side bars, having rearward free-ended handle portions, adapted to be grapsed by an operator of the apparatus; and a motor-supporting platform, between and rigidly connected to said side bars; a plow-supporting axle, forward of said handle portions, between and attached to said side bars; plow means pivotally mounted on said plow-supporting axle and in use extending downward into the ground; bearing means providing for pivotal movement of said plow means relatively to said frame; a wheel axle, forward of said platform, connected to said side bars and spanning the space between them; driving-wheel means on said wheel axle, comprising: a driving wheel having an egg-shaped periphery, cross-sectionally central portions of said periphery being aligned with said plow means; and soil-aerating studs, fixed to said periphery, at least part of said studs being located on side portions of said periphery, out of alignment with said plow means, adapted to slantingly enter and leave the soil; motor means; mounted on said platform; and power-transmission means, connected to said motor and to said wheel means, for transmitting power to the wheel means.