Comparação dos penetrômetros de impacto e eletrônico na avaliação da resistência mecânica a penetração do solo

Abstract

Currently, the most used penetrometers are classified by the principle of penetration. However, independently of the functioning system, it is mandatory for the mechanical resistance to be determined in a precise way and, preferentially, with reliability and repeatability of its results. This work aimed to compare the soil penetration resistance determined by both impact and electronic penetrometers, also evaluating its efficiency by the correlation with attributes of soil physical quality. The studies were performed in an Entisol in transition for an Inceptisol, with conventional management of crop-livestock integration adopting the soybean-oat succession, in the Jardim Alegre Municipality, Parana State. The soil penetration resistance was determined by using both impact (IAAPLANALSUCAR/STOLF) and electronic penetrometers (PLG 1020 penetroLOG2) in a completely randomized design with four replicates and plots of 10.000 m². The evaluation was performed in 30 sample points per replicate at depths of 0-5 cm; 5-10 cm; 10-20 cm; 20-30 cm; 0-30 cm. Together, deformed and undisturbed samples were collected to determinate apparent density, total porosity, gravimetric moisture and soil texture. From the results obtained, it was verified that the impact and electronic penetrometers have presented similarities in the behavior, however, the impact penetrometer represented more precisely the soil conditions.