Variabilidade espacial das propriedades físicas de um solo sob sistema de integração lavoura-pecuária

Abstract

The soil it is not a homogeneous body. Consequently, it can shows several changes alongside an area in its physical properties. In recent years, there has been a greater concern about problems related to soil degradation and the need for a more detailed and accurate assessment of the state of our agricultural soils. The aim of these paper was was to investigate the spatial variability of soil physical properties in a field of crop integration. The experiment was carried out at São Xavier’s farm in the city of Chopinzinho - PR. Thirty six collection points were evenly distributed and spaced, creating a 6x6 mesh. At each point, undisturbed soil samples were collected from a metal ring. The samples were collected in two different depths: 0 to 5 cm and 10 to 15 cm. The density, total porosity, macroporosity and microporosity of the soil in the two depths were evaluated. Furthermore, geostatistical analyzes were performed using the GS + software, generating semivariograms and kriging. The semivariograms were adapted to the models that best represent the variables. As a result, the variables density and macroporosity has shown spatial dependence for the two depths. Also, the variables microporosity and total porosity has not shown spacial dependency in either depths, therefore, it was not possible to conduct the semivarigram adjustment or the data interpolation.