A combine harvester, or simply a combine, is a machine designed to harvest variety of grain crops efficiently. It combines the tasks of harvesting, threshing, and cleaning grain crops- into a single process. The objective is the harvest of the crop such as; rice, corn (maize), sorghum, soybeans, flax (linseed), oats, wheat, rye …etc.
The waste straw left behind on the field is the remaining dried stems and leaves of the crop with limited nutrients which is either chopped and spread on the field or baled for feed and bedding for livestock.
This is heavy machineries, thus can be only used efficiently in plain terai region. This machine is expensive for a single farmer.