Subsoiler

A subsoiler or flat lifter is a tractor mounted implement used to loosen and break up soil at depths below the level of a traditional ploughing, disk harrow or rototiller. Most tractor mounted cultivation tools will break up and turn over surface soil to a depth of 15–20 cm (6–8 in) while a subsoiler will break up and loosen soil to twice those depths. Typically a subsoiler mounted to a Compact Utility Tractor will reach depths of about 30 cm (12 in) and typically have only one thin blade with a sharpened tip.