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A swather, or windrower, is a farm implement that cuts hay or small grain crops and forms them into a windrow. "Swather" is predominantly the North American term for these machines. In Australia and other parts of the world, they are called "windrowers".
A swather may be self-propelled via an internal combustion engine, or may be drawn by a tractor and powered through a power take-off shaft. A swather uses a sickle bar (see mower) to cut the stems of the crop. A reel helps the cut crop fall neatly onto a canvas or auger conveyor which moves it and deposits it into a windrow, with all stems oriented in the same direction. As combines replaced threshing machines, the swather was needed to replace the binder. The mown strip left behind is the swathe.
Swathing (windrowing) is more common in the northern United States and Canada because the curing time for grain crops is reduced by cutting the plant stems. In regions with longer growing seasons, grain crops are usually left standing and harvested directly by combines.
The Swather is the mascot of sports teams at Hesston High School in Hesston, Kansas, USA. Hesston is the home to AGCO Corporation's large swather and combine harvester manufacturing plants.