Effect of Design Parameters of Rotary Tillers on Unevenness of the Bottom of the Furrows

One of the widely used tillage implements in gardens and paddy fields is rotary tiller, which can prepare the seed bed in a single step. However a special consideration in using rotary tillers is the unevenness of the bottom of the furrows due to the consecutive intersection of two adjacent trochoids, i.e., blade trajectories, yielding roiling and displacement of a seed inside the furrow in precision planters. Precision planting is possible when furrow unevenness is reduced to a minimum and meanwhile planting depth remains constant. This is especially important when the distance between two neighbor seeds in a row is low. This paper studies analytically the effect of design parameters of the rotary tiller on the quality of the furrows. The obtained results indicate that height of unevenness of the furrows decreases with increasing the number of blades on each flange, increasing the rotor speed and decreasing the forward velocity.