The uniformity of spread patterns is difficult to ensure in the presence of non-flat fields disturbances. In order to investigate the relevance of developing control devices intended to address this issue, disturbances on simple cases of slope and side-slope are assessed. For this purpose, single spread patterns are simulated on both cases and comparisons are made with the range of particles on a flat field. Then, other simulations are carried out while the spreader is put in configurations with tilt and side-tilt. The obtained results in the form of displacement fields show that the non-flat fields lead to a non-uniform skewing of spread patterns characterized by varying magnitudes and directions of displacements. When the spreader is set with tilt and side-tilt, a decrease in the magnitudes of displacement is observed. In addition, the control values of these angles are found smaller than the degrees of the field inclination. Thus, a control strategy is needed as well as a dynamic on-the-field simulation model that will help investigate the effects of disturbances and control on global spread patterns.