Mähdrescher

Mähdrescher, German for "combine harvester," is a field machine used to harvest grain crops. A combine integrates reaping, threshing and winnowing in a single operation. It is commonly used for cereals such as wheat, barley, oats and rye, and can be equipped with different headers for maize, rice and other crops.

Operation: A front-mounted header cuts the crop and feeds it into a feeder. The threshing mechanism separates grain from straw, while concaves and sieves separate the grain from chaff using air flow. The grain is collected in a tank and later unloaded via a grain auger; the remaining straw is expelled or chopped.

Types: The main forms are self-propelled combines, which integrate engine and cab, and trailed or mounted (pull-type) designs that require a tractor. Headers vary by crop: narrow “grains” headers for cereals and specialized maize, sunflower or flax headers.

History: Early 20th-century developments produced self-propelled models, with widespread adoption after World War II. The technology increased efficiency and reduced labor, enabling larger farms and mechanized grain production worldwide.

Manufacturers and use: Leading producers include Claas (Germany), John Deere (USA), New Holland (Italy/USA), Case IH and Massey Ferguson. Modern combines integrate digital features such as GPS guidance, yield and moisture sensing, and automated header control to improve performance and reduce losses.

Safety and maintenance: Operation involves moving parts and high noise; routine maintenance, proper guarding and safe operating procedures are essential. Fuel use and emissions are considerations in modern designs, along with efforts to maximize residue management and minimize soil compaction.