ABSTRACT The term Post-Barreiras is a definition for sediments above the deposits of the Barreiras Formation, and the genesis of soils in these environments must be related to sedimentary deposition. Our objective was to apply multi-technique analyses to characterize the sediments and soils to understand pedogenesis in these environments. We analysed sedimentological parameters and the geochronology of sediments. Morphological, chemical, and mineralogical analyses allowed the characterization of the soil. Also, these data supported the analysis of lithological discontinuity. We considered […]

ABSTRACT: Extremely kaolinitic soils of Tertiary age elevations on the Brazilian east coast present a wide range of texture, which is recognized as one of the main factors controlling the soil organic matter contents. This study aimed to investigate the organic C storage of different compartments of kaolinitic soils. The studied soils had a wide particle size gradient, were under native forest vegetation, and located on Brazil’s eastern coast (Coruripe – CF, Umbaúba – UF, Nova Viçosa – VF, Sooretama […]

Many soils have a hard-setting behavior, also known as cohesive or “coesos”. In such soils, the penetration resistance increases markedly when dry and decreases considerably when moist, creating serious limitations for plant emergence and growth. To evaluate the level of structure degradation in hard-setting soils with different texture classes and to create an index for assessing soil hardness levels in hard-setting soils, six soil representative profiles were selected in the field in various regions of Brazil. The following indices were […]

Studies on Spodosols in tropical coastal tablelands are still scarce. This paper studied such soils on coastal tablelands and a marine sandbank, in the States of Paraiba and Pernambuco, in Northeastern Brazil. Physical, chemical and mineralogical analyses were performed in 14 soil profiles on mostly plain surfaces under sugarcane cultivation. With regard to drainage, most of the profiles were defined as moderate to poorly drained and groundwater was detected at a depth of 182, 85 and 74 cm in three […]

The application of sugarcane residues to the soil may induce changes in soil compressibility parameters. The objective of this study was to investigate the compressibility behavior of a dystrophic cohesive Yellow Latosol in the coastal tablelands of the state of Alagoas, in three different management systems with sugarcane, with different levels of organic residue application. The experiment was conducted in an area of sugarcane production (Usina Santa Clotilde), Alagoas. Three plots were chosen in sugarcane fields: sugarcane under irrigation (SMI), […]

One of the ways to evaluate the soil structural status is by means of the pre-compaction pressure and soil penetration resistance. In view of the importance of associations between two variables in soil science, the objective of this study was the decomposition of the direct and indirect effects (“path coefficient analysis”) of soil physical properties and organic matter on pre-compaction pressure (sp) and laboratory-determined soil penetration resistance (LPS) of a cohesive Yellow Ultisol under sugarcane in the coastal tablelands of […]

The cohesive character is a property of subsurface soil horizons with hard to extremely hard consistency when dry, and friable or firm when wet. Despite the agricultural importance, the formation of these horizons has not been fully explained. The objective of this study was a chemical, mineralogical and micromorphological characterization of cohesive soils of the Coastal Tablelands in Northeast Brazil, to understand their pedogenesis and identify properties for the definition of the cohesive character by the Brazilian System of Soil […]