SHEAR STRENGTH OF A DYSTROPHIC RED LATOSOL UNDER DIFFERENT MANAGEMENT SYSTEMS DETERMINED BY VANE TEST

Abstract

The soil shear strength can be influenced by the use intensity and management of soil, resulting in considerable changes in its physical-mechanical properties. This study evaluated the shear strength of a Red Oxisol dystrophic soil subjected to different uses and management systems, using Vane Shear Test in the laboratory. Samples with preserved structure were collected from areas under no-tillage, pasture or native forest in the city of Dourados-MS. The samples were collected to depths of 0 to 0.05 and from 0.05 to 0.10 m, in seven replications. After equilibrating to matric potential of 6 kPa in the Richards’ pressure chamber, each sample was subjected to the vane to determine shear strength and bulk density. The maximum shear strength and bulk density was found in the area under pasture. The shear strength was associated with increased density, use and management, but distinctly at two depths.