tarières

A tarière is a tool used to bore cylindrical holes in soil. It consists of a helical cutting blade (a screw-like auger) attached to a shaft; as it rotates, the blade cuts through the earth and lifts the material to the surface. Tarières can be manual or powered by an engine or hydraulic system and are employed in agriculture, landscaping, forestry, and civil works to create holes for planting, installing posts, or sampling soil.

Manual tarières are typically hand-cranked or operated with a T-handle, producing small to medium-diameter holes suitable for planting trees or shrubs, or for soil sampling. Larger tarières are mounted on tractors or excavators and can bore deeper or wider holes, used for fence posts, tree plantations, drainage installations, or construction foundations.

In practice, the tool works by turning the helical blade to cut a cylinder of earth, which is carried to the surface by the spiral. Soil and debris are removed as the auger advances. Operators should locate utilities before drilling, follow safety instructions, and consider soil conditions such as hardness or rock content that influence performance.

See also: auger; post-hole digger. The term tarière in English is usually translated as auger or earth auger.