SPATIALIZATION OF PHYSICAL, MECHANICAL AND CHEMICAL CHARACTERISTICS OF SOILS IN DIFFERENT MODELS OF SLOPES IN PORTO VELHO – BRAZILIAN AMAZON

Abstract

In this study, it sought to spatialize the mechanical, physical and chemical soil parameters in 3 different slope models (Convex, Rectilinear and Concave) in Oxisols under the Tabular relief of the Belmont basin stream in Porto Velho city, Rondônia state - Brazil. For analysis of the slopes, topographic plots of the soil in the top, middle and bottom up to 1.5 m in depth were used in auger and trenches,spatialized by interpolation. It was observed that the Convex slopes followed by the Rectilinear slopes presented higher clay content in the soils, with an increase in sand to the foothills. The organic matter in the slopes indicated that the Concave format presents the greatest amount of these, followed by Rectilinear and Convex. The infiltration revealed that the Convex and Rectilinear are similar, with greater infiltration at the top, however, the Concave slope showed the least infiltration at the top. The middle of the slopes stands out, which registered the lowest pH values. The justification would be that in the middle of the slopes there is a greater slope and greater water flow, which contributes to a greater circulation of organic acids from organic matter in the superficial layers and upstream.