a farm implement used to break up the surface of the soil (for aeration and weed control and conservation of moisture)

draw a harrow over (land)

a harrow with a series of disks set on edge at an angle

a harrow used to refine seed-bed condition before planting, to remove small weeds in growing crops and to loosen the inter-row soils to allow for water to soak into the subsoil.

a harrow that uses a series of turning spiked wheels for breaking up and smoothing out the surface of the soil.