Threshing is used for separating seeds from the harvested stalks. The method of separation is based on the fact that stalks of the crop plant and the chaff are soft materials whereas grains itself are hard. Being soft, stalks and chaff can be broken into pieces on beating on rocks or wooden planks but grains remain unaffected. Now a days, threshing machines are used for this purpose. Separation out of the food grains from dried plants is called threshing.
