Separating remaining loose chaff from the grain is called winnowing – traditionally done by repeatedly tossing the grain up into a light wind which gradually blows the lighter chaff away.
chiefly British. : to judge which people or things in a group are bad and which ones are good The magazine describes many different products and then separates the wheat from the chaff.
Many translations use "weeds" instead of "tares". A similar metaphor is wheat and chaff, replacing (growing) tares by (waste) chaff, and in other places in the Bible "wicked ones" are likened to chaff.
It comes from the age-old practice of literally separating wheat from chaff. When winnowing grain, farmers wanted to remove all chaff from wheat. In the literal meaning, chaff is the husk around a seed, which one does not eat. In order to eat the wheat, one must remove the chaff.
Threshing: Pounding the sheaves against the wooden bars is performed to remove the grains from the stalks. Winnowing: this is the method of separating the unpleasant husk from food. It is achieved by pouring the grains on a windy day, from a height, when the grains fall on the ground and the chaff is swept away.
Chaff and Digestion
The presence of a high fibre feed such as chaff in the stomach helps to neutralise stomach acid. Chaff will also encourage chewing, prolonging feeding time and the production of increased amounts of acid-buffering saliva.
Gregory the Great: After the threshing is finished in this life, in which the grain now groans under the burden of the chaff, the fan of the last judgment shall so separate between them, that neither shall any chaff pass into the granary, nor shall the grain fall into the fire which consumes the chaff.
Threshing (thrashing) was originally "to tramp or stamp heavily with the feet" and was later applied to the act of separating out grain by the feet of people or oxen and still later with the use of a flail.
Threshing is based on the principle that when:
Some impact or pounding is given on crops; the grains are separated from panicles, cobs or pods. 2. The crop mass passes through a gap between drum and concave, wearing or rubbing action takes place. This separates grains from panicles.
Why is proper and timely threshing important? Any delay between cutting and threshing causes rapid deterioration of the grains, especially during field drying or when the crop is stacked or piled in the field. Improper threshing can also cause high threshing and scattering losses.
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