A combine is a large farm machine that combines the tasks of harvesting, threshing, and cleaning grain crops. Combines are equipped with removeable heads, called headers, that are designed for particular crops, such as corn (maize), soybeans, flax (linseed), oats, wheat, or rye (among others). The combine harvests the crop, leaving waste straw behind on the field to be either chopped and spread on the field or baled for livestock feed and bedding. This waste straw has limited nutrients and is composed of the remaining dried stems and leaves of the crop. Modern combines use a variety of technology to maintain a constant engine and threshing speed, propell the combine, or keep the combine from tipping over. Some combines also have a variety of technological instruments on board as part of the monitor console to calculate combine speed and other keep track of other important information.
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