This research was conducted aiming to evaluate the effects of crop systems and materials for acidity correction on soil physical attributes between October/2006 and July/2008, in Botucatu-SP, Brazil. The experimental design was the completely randomized block, with subdivided plots and eight replications. Plots consisted of four crop systems, as follows: I-soybean/fallow/maize/fallow; II-soybean/white oat /maize/common bean; III-soybean/millet/maize/cowpea; IV-soybean/signal grass/maize/signal grass. Subplots were defined by superficial liming and silicon application, to raise base saturation up to 70%, and a control. Aggregate stability, soil density, total porosity, macroporosity and microporosity were determined. Soil penetration resistance and moisture were also evaluated. Means were compared by the t test (LSD) at a probability level of 5%. Superficial application of materials for acidity correction increases soil total porosity, accentuated down to 0.20 m and 0.10 m after silicate and lime application, respectively. Soil structuring is harmed by the cultivation of only a crop per season, decreasing aggregate stability and increasing penetration resistance in superficial soil layers. Signal grass cultivated between summer crops increases aggregate stability-index down to 0.10 m the soil profile.