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The modern agricultural technology is based on intensive machine use that promote strong alterations on soil physical parameter, such as, soil density, porosity and compaction. This alterations contribute to decrease crop yield and minimize farmer savings. This research was conducted with the aim to develop and evaluate a methodology to determine soil physical parameters related to agricultural machine workdays. A computational system was developed to determine dynamical soil/wheel contact pressure and the soil load capacity, based on preconsolidation pressure. To evaluate this methodology, a experimental design was done in a Latossolo roxo (heavy clay soil), in Botucatu county, Brazil, constituted by two traffic conditions (with and without) and four periods after rain (one, two, four and six days), followed an random blocks design with sub-parcels. There was no statistical difference on soil density before traffic showing that the compaction was uniformly distributed all over the parcels. After traffic the density has increased about 24.7%, 19.3%, and 14.6% for one, two and four days after rain, respectively. There was no significantly statistical difference on soil density for six days after rain condition, showing that the waiting time after rain to realize traffic with dynamic pressure of 1169 kPa should be between 4 - 6 days.