Cultivator is a farm implement for stirring and pulverizing the soil, ... The cultivator usually stirs the soil to a greater depth than does the harrow. ...
www.en.wikipedia.org/wiki/Cultivator

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cultivator - a farm implement used to break up the surface of the soil (for aeration and weed control and conservation of moisture)
www.thefreedictionary.com/cultivator

...Cultivator is a farm implement for stirring and pulverizing the soil, either before planting or to remove weeds and to aerate and loosen the soil after the crop has begun to grow. The cultivator usually stirs the soil to a greater depth than does the harrow. The cultivator is used in crop work or farming.