Wind winnowing
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Wind winnowing is a method developed by ancient cultures for agricultural purposes. It involves taking a basket of mixed grain and chaff, or using a winnowing fork on a pile of harvested grain and tossing the contents into the air, thus causing the chaff to blow away while the heavier grains fall back into the basket or onto the ground or threshing floor.
The chaff consists of calyxes, stems, old petals, husks, and dead parts of the fruit or flower.
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