Bokosi la giya la rotary tiller ndi gawo lofunikira pa makina ozungulira.Imagwira ntchito yofunika kwambiri potumiza mphamvu yopangidwa ndi thirakitala kupita kumalo ozungulira omwe amagwiritsidwa ntchito pothyola ndi kumasula nthaka kuti ikulime.Bokosi la giya logwira ntchito bwino limatsimikizira kuti masamba ozungulira amazungulira pa liwiro lalitali lofunikira pakulima bwino nthaka, njira yofunika kwambiri paulimi.