1. The common method for threshing is hand threshing. In this, the separating of grain is from the panicle is done by hand beating, treading, or by holding the crop against a rotating drum with spikes or rasp bars.
2. Hand beating methods are normally used for threshing of rice that easily shatters. Hand threshing methods include: • Foot threshing or trampling: use of bare feet to thresh the crop. To do this successfully, the crop is spread over a mat or canvass and workers trample with their feet
• Beating against a threshing rack: the farmer holds the crop by the sheaves and thrashes it against a slatted bamboo or wooden platform
• Flail: the use of a flail or stick for thrashing the crop
• Using a pedal thresher or treadle thresher.
3. The another traditional method is use of animals to thresh the grain. Animal threshing is normally carried out at a designated location near the field or in the village. In some regions, animals have been replaced by tractors. After animal treading, cleaning of the grain is done by winnowing, with or without the aid of an electric fan.
4. The pedal thresher or treadle thresher consists of threshing drum, base, transmission unit and a foot crank. When pedalled, the threshing drum rotates and rice can be threshed when panicles are applied against the threshing drum. Because small straws, chaff, and foreign matter drop along with the threshed grain, whole grains must be separated using a flail, sieve or by winnowing.