Alterações dos atributos físicos de um Latossolo Vermelho submetido a diferentes sistemas de manejo

Abstract

The cultivation of the soil may alter some physical attributes compared to non cultivated soil. The objective of this study to verify changes caused by land use systems on some physical attributes of an Oxisol in the Triângulo Mineiro. The used treatments were: Native field (CN) (control); Conventional preparation of the soil (PC); Irrigated pasture of brachiaria under pasture alternate (PT) and Direct tillage (DT). A completely randomized design with four replicates were evaluated in the following physical attributes: density of the soil (Ds), total volume of pores (VTP), microporosity (MI), macroporosity (MA), saturated hydraulic conductivity (Kθ, mechanical resistance of the soil to the penetration (RP) and the index sensibility (Is). Areas under PC, SD and PT significant changes were not observed with respect to the physical attributes assessed. For the depths evaluated, significant differences were observed only between the depths from 0.00 to 0.05 and from 0.15 to 0.20 m for the parameters Ds and VTP. PC, SD, PT and CN presented average volumes of MA near or above that considered ideal (0,33 dm-3dm-3). Only on CN, values higher than 2 MPa were not observed. On CN values greater than 2 MPa; In CN, PC and SD there were no limitations at crop development to a depth of 0.08 m. The calculated Is attributes Kθ and CC in the systems PC and PT demonstrated the harmful effect of these management systems on soil structure, when compared to SD.