Agriculture is a long-term practice which involves certain strategies called farming practices/agriculture practices. It begins with the soil preparation and the last stage is storage of the yield. In between these two stages, few important events also take place. Threshing is one among them.
Threshing is the process of separation of grain from the stalk on which it develops and from the chaff or unit that covers it. In the process, the edible part of the crop is loosened but not the fiber part. It is done after harvesting and before winnowing. The technique that was used in old times was striking the harvested ears of grain with a thrash and this was done manually. Alternatively, horses, donkeys or bulls trod out the grain from stalks. After this, the straw was gathered and raked away while the grains were winnowed to remove the debris. During winnowing, the air current blew away the light weighed waste particles leaving behind the heavy grain particles. But the whole process was tedious.
Later in the seventies, Andrew Meikle contrived a threshing machine. Piles of grain were sustained into a spinning chamber furnished with wooden mixers. The machine had a saw-tooth like drum to rake away the free straw and pushed the remaining waste and grain through a strainer into a set of rollers that further isolated the chaff from the grain before winnowing. The working principle of Meikle’s machine has been used in all threshing machines including the advanced self-moved combines. Combine harvesters do the harvesting, threshing and winnowing.
Threshing was usually carried out in an isolated plot of land called threshing floor. Some threshing floor were flattened circular or paved surface (outdoor) but usually in a small-scale farming, the floor used to be a stone or a wooden plank. Outdoor floors were a common property used by a whole village. But unfortunately, modern machines and technologies outsourced floor.
Get to know about various separation techniques like handpicking, winnowing, and seiving etc by subscribing BYJU’s on youtube. Separation methods can also be classified on the state of substances to be separated. If it is in liquid state then it can be separated using methods like chromatography, decantation, filtration etc. If it is in solid state then it substances can be seggregated from the mixture using the methods like winnowing, seiving etc. Also experience a magnificient way of teaching by downloading Byju’s-The Learning app or you can also visit us on byjus.com.