Introduction

• Threshing is the process of detaching grains from the ear heads or from the plants by striking, treading or rubbing.
• Done by rubbing between stone or wooden rollers on a threshing floor or between the rasp bar and concave of a combine.

Classification of threshers

A) Depending upon source of power:

1. Threshing by manual labor: – Process of beating the harvests on a floor or beating by stick is the method followed for small quantity of harvests.
2. Threshing by animals: – The harvest is spread on a clean threshing space, the animals are tied in line one after the other with the help of a strong pole, fixed in the center of the threshing space. Animals move round and round on the harvest and trample them continuously till the grains are completely separated from straw.
3. Threshing by machine (Power Thresher): operated by electric motor, engine, tractor or power tiller used for threshing. The removal of seeds from the grain heads is done by rotating cylinders. When a slow-moving material comes in contact with the high-speed cylinder, the heads or pods are shattered and grains are freed from straw.