Disc harrow is a tool used to process land where crops will be planted. It is also used for crushing unwanted weeds, grasses or crop residues. Dics harrow is primarily used to crush soil that was recently plowed in order to remove clods and soften the soil. It is used to chop the remains of old crops such as corn stalks to prepare the earth. It facilitates the penetration of water into the soil, increases the aeration and activity of the soil and the living community in the soil.