The compaction process can promote changes in the physical attributes of soil, to the point of limiting the genetic potential for the development of more sensitive agricultural crops or cultivars. The goal of this study was to evaluate, on a clayed Red Latosol (Oxisol), the response of production parameters of different varieties of soybean (Glycine max) and physical attributes of soil under tillage farming, and with additional compression. The study was conducted at C-Valley Agroindustrial Cooperative, in Palotina (Paraná State). Two treatments of soil were evaluated: no-tillage without additional compaction (PD-C0) and no-tillage with additional compaction (PD-C1), and five varieties of soybeans: (1) Coodetec 204, (2) Coodetec 215, (3) Monsoy 5942, (4) Embrapa 48 and (5) Spring. A completely randomized experimental design in a 5 x 2 factorial scheme was adopted. The attributes of soil evaluated were: bulk density, total porosity, macro- and microporosity. In the plants, the following parameters were assessed: harvesting dates, plant height, height of insertion of the first pod, mass of one thousand grains and productivity. The results showed that the parameters for the production of soybean cultivars were not influenced by the different levels of soil compaction, and the differences observed were due to the characteristics of the cultivars themselves.
bulk density; soil porosity; Glycine max L. Merril; soil compaction
