Rotary tillers are power-take-off-powered implements that incorporate crop residue or soil amendments with the soil and pulverize the soil to a fine tilth. Soil is tilled by a rotating, horizontal shaft with L-shaped tines that penetrate and stir the soil. Tiller width varies from 30 to 90 inches and requires 20 to 100 horsepower.
Rotary tillers are very effective for chopping crop residue or sod and incorporating it into the soil and for incorporating fertilizer, mulches, manure, or other amendments into the soil. They are used in gardens, landscaping, and site-specific agricultural applications. Rotary tillers require more horsepower than other tillage implements and do not lend themselves to large scale operations. Rocks and abrasive soils cause excessive wear on the tines. Some companies list rotary tillers as attachments for landscaping tractors with less than 80 horsepower.