ABSTRACT Horizons with varying degrees of cementation are a common feature of the soils from the coastal tablelands of Northeastern Brazil. In most cases, these horizons are represented by the following subsurface horizons: fragipan, duripan, ortstein, and placic. The aims of this study were to analyze differences regarding the development and the degree of expression of cementation in soils from the coastal tablelands of Northeastern Brazil: Planossolo Háplico (p-SX), Espodossolo Humilúvico (p-EK), Espodossolo Ferrihumilúvico (p-ESK), and Argissolo Acinzentado (p-PAC) pedons. […]

The objective of this study was to evaluate the physical, chemical, mineralogical and micromorphological characteristics of cohesive red, yellow and grayish soils in a toposequence of the Coastal Tablelands region in southern Bahia and northern Espirito Santo states. It was also sought to understand the mechanisms promoting their cohesion and fragipan formation. Therefore, the routine physical analyses, determination of the coarse clay/fine clay ratio, specific surface by BET-N2 and water vapor adsorption, magnetic susceptibility, scanning-electron microscopy analyses and the micromorphology […]

The objective of the present study was to make the physical and chemical characterization of soils developed on sediments of the Barreiras group, in southern Bahia, as well as soils formed from rocks of the crystalline basement, which were taken as reference. For this purpose, soil horizon samples from two representative toposequences of the Coastal Plain were selected and analyzed: (1) eutrophic argisolic Red Latosol, latosolic dystrophic Yellow Argisol, duric orthic Ferrocarbic Spodosol; (2) dystrophic abruptic Yellow Argisol, dystrophic typic […]