ost widely-used harrow. They are tractor-driven and are raised either by a three-point lift or hydraulically by wheels.
Main components of disc harrows are notched disc blades. Disc blades are perpendicular to the floor, and there is an adjustable inclination angle between blades and direction of forward motion. During operations, pulled by the tractor, disc harrows rolling on, disc blades cut the grass roots and crop stubble. In this process, fertilizer and pesticide are mixed together with soil. In general, according to configuration form of disc gang, disc harrows can be classified into 3 kinds: Single Action Disc Harrow, Tandem Disc Harrows, and Offset Disc Harrow.