Fractal Clod Size Distribution Formed by Rotary Tiller

A fractal relationship about clod size distribution formed by rotary tiller was put forward． The mean value and deviation of the distribution can be obtained from this relationship. The relationship was verified by using test data. The influence of forward speed, rotary speed of rotor and oblique angle on the distribution of clod size formed by oblique rotary tiller was analyzed by using the relationship.