Does the Winnoing method is really useful because when the lighter material is biow with the air and we want both the material lighter & hevier material ????

The process of separating light materials from heavier materials in a mixture with the help of wind or moving air is called winnowing. Wind blow away the lighter particles and they get sediment in a separate place. Farmers usually use this technique to separate husks from grains. When air is blown during winnowing, the husks are carried away by the wind and are collected in a place with distance. The heap of grain is found near the place of winnowing. Farmers use this separated husk for feeding the cattle.