The study was carried out in the experimental area of the Laboratory of Investigation of Accidents with Agricultural
Machines, at the Department of Agricultural Engineering of the Federal University of Ceará (3° 44’ S; 38° 34’ W; 19.6 m). The area is intended for experiments with conventional system and there is no vegetal cover. The soil is Yellow Red Argisol with sandy loam texture and approximately 82.90% of sand, 10.60% of clay and 6.40% of silt.