Avaliação comparativa da resistência mecânica do solo obtida com dois tipos de penetrômetros.

Abstract

The mechanical resistance of the soil to penetration is an important index for characterization and management of the soil, and is related to the water content and soil density. The objective of this work was to evaluate soil mechanical resistance to penetration (SMRP) in a RHODIC HAPLUSTOX as a function of different water contents at two depths, using two types of penetrometers: a constant-speed penetrometer and an impact penetrometer. The randomized block experimental design was used, with eight treatments and five replicates arranged in a split-plot scheme, with four water content ranges as plots; and two sampling depths as subplots. With the results obtained, it was verified that: 1) reduction of the water content of soil influenced directly in the increase of the SMRP; 2) significant differences in the values of resistance had occurred, when measured with the two types of penetrometer and 3) the layer of 0,15 the 0,20 m presented greater SMRP; 4) the impact penetrometer presented greater relation with analyzed attribute.