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Rice winnowing, Uttarakhand, India Winnowing in a village in Tamil Nadu, India Use of winnowing forks by ancient Egyptian agriculturalists. Winnowing is a process by which chaff is separated from grain. It can also be used to remove pests from stored grain. Winnowing usually follows threshing in grain preparation. In its simplest form, it ...
Threshing or thrashing is the process of loosening the edible part of grain (or other crop) from the straw to which it is attached. It is the step in grain preparation after reaping . Threshing does not remove the bran from the grain.
The process of loosening the chaff from the grain so as to remove it is called "threshing" before "drying" – traditionally done by milling or pounding, making it finer like "flour". Separating remaining loose chaff from the grain is called " winnowing " – traditionally done by repeatedly tossing the grain up into a light wind, which ...
Certain shellers can damage the grain, making insect penetration easier. For crops other than maize, threshing losses occur as a result of spillage, incomplete removal of the grain or by damage to grain during the threshing. They can also occur after threshing due to poor separation of grain from the chaff during cleaning or winnowing ...
In general, the term "threshing board" is used to refer to all the different variants of this primitive implement. Technically, we should distinguish at least the two main types of threshing boards: the "threshing sledge," which is the subject of this article, and the "threshing cart." The "threshing sledge" is the most common type.
The name of the machine is derived from the fact that the harvester combined multiple separate harvesting operations – reaping, threshing or winnowing and gathering – into a single process around the start of the 20th century. [2] A combine harvester still performs those operation principles.
After this threshing process, the broken stalks and grain were collected and then thrown up into the air with a wooden winnowing fork or a winnowing fan. The chaff would be blown away by the wind; the short torn straw would fall some distance away; while the heavier grain would fall at the winnower's feet. The grain could then be further ...
Threshing stone near Goessel, Kansas at Alexanderwohl Mennonite Church. (2010) A threshing stone is a roller-like tool used for the threshing of wheat.Similar to the use of threshing boards, the stone was pulled by horses over a circular pile of harvested wheat on a hardened dirt surface (threshing floor), and the rolling stone knocked the grain from the head of wheat.