What is the use of a cultivator?

Cultivator is a farm equipment used for stirring and pulverizing the soil before planting or to eliminate weeds and to aerate and loosen the soil before plant begins to grow. It is powered by a tractor and stirs the soil to a great depth. Most of the cultivators are equipped with a hydraulic wing .Unlike a harrow , which disturbs the entire surface of the soil, cultivators are designed to disturb the soil in careful patterns, sparing the crop plants but disrupting the weeds.