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All publications of “Antonio Carlos de Azevedo”

7 results

Field Perception of the Boundary Between Soil and Saprolite by Pedologists and its Differentiation Using Mathematical Models

Roseclênia Alves Santos ORCID logo , Renata Alcarde Sermarini ORCID logo , Adriano Ribeiro Guerra, Jean Cheyson Barros dos Santos, Antonio Carlos de Azevedo ORCID logo


ABSTRACT Saprolite plays a central role into hydrologic and nutrient cycles. Despite that, saprolite research is scattered and uses heterogeneous, sometimes conflicting, methods and concepts. During field work, it is difficult to assign the boundary between soil and saprolite. This paper aimed to identify the subjacent logic that pedologists use to assign to a regolith volume its soil or saprolite nature. To achieve this goal, a tree algorithm was used to build a hierarchy of physical and chemical properties of […]

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Mineralogy and Concentration of Potentially Toxic Elements in Soils of the São Francisco Sedimentary Basin

Edilene Pereira Ferreira, Ricardo Marques Coelho, Gustavo Souza Valladares, Laura Milani da Silva Dias, Ana Carolina Cunha de Assis, Rafael Cipriano da Silva, [...]


ABSTRACT Lithological and geomorphological variations determine formation of soils with different mineralogical constitutions and can influence the distribution of potentially toxic elements (PTE). The aim of this study was to determine the contents of PTE and mineralogical assemblages along soil profiles of different classes and parent materials and to investigate the association among these factors in the São Francisco sedimentary basin in the northern part of the state of Minas Gerais (Brazil). Eight soil pedons of different classes that developed […]

Genesis and Classification of Soils Containing Carbonate on the Apodi Plateau, Brazil

Edilene Pereira Ferreira, Lúcia Helena Cunha dos Anjos, Marcos Gervasio Pereira, Gustavo Souza Valladares, Rafael Cipriano-Silva, Antônio Carlos de Azevedo


ABSTRACT Information is scarce on the genesis and classification of soils derived from calcareous rocks in the Northeastern region of Brazil. This study describes the morphological, physical, chemical, mineralogical, and micromorphological properties of four soil profiles (P1-P4) located in the Apodi Plateau. A pedogenesis hypothesis and soil classification, according to the Brazilian System of Soil Classification (SiBCS), are proposed for these profiles. The interactions between parent material, surface topography and climate affected the pedogenesis processes and soil properties, although the […]

Boundary between Soil and Saprolite in Alisols in the South of Brazil

Fabrício de Araújo Pedron, Rodrigo Bomicieli de Oliveira, Ricardo Simão Diniz Dalmolin, Antonio Carlos de Azevedo and, Ricardo Vargas Kilca


Despite numerous studies conducted on the lower limit of soil and its contact with saprolite layers, a great deal of work is left to standardize identification and annotation of these variables in the field. In shallow soils, the appropriately noting these limits or contacts is essential for determining their behavior and potential use. The aims of this study were to identify and define the field contact and/or transition zone between soil and saprolite in profiles of an Alisol derived from […]

Hydraulic conductivity and water retention in leptosols-regosols and saprolite derived from sandstone, Brazil

Fabrício de Araújo Pedron, Jessé Rodrigo Fink, Miriam Fernanda Rodrigues, Antonio Carlos de Azevedo


Leptosols and Regosols are soils with a series of restrictions for use, mainly related to the effective depth, which have been poorly studied in Brazil. These soils, when derived from sedimentary rocks should be treated with particular care to avoid environmental damage such as aquifer contamination. The purpose of this study was to verify the behavior of hydraulic conductivity and water retention capacity in profiles of Leptosols and Regosols derived from sandstone of the Caturrita formation in Rio Grande do […]

Morphology of soil-saprolite-rock contacts in neossolos derived from sandstone (caturrita formation) in Rio Grande do Sul, Brazil

Fabrício de Araújo Pedron, Jessé Rodrigo Fink, Ricardo Simão Diniz Dalmolin, Antonio Carlos de Azevedo


The use of the shallow Neossolos (Leptosols and Regosols) is limited in view of the small depth and rock fragments on the surface. There is a lack of information about the definition of the contacts between soil, saprolite and rock in this soil class, as well as tools that would facilitate the morphologic field identification. The objectives of this research were an evaluation of the morphology of the contact between soil, saprolite and rock in the Neossolos derived from the […]

Morphology and taxonomy classification of neossolos and saprolites derived from volcanic rock of the Serra Geral formation in Rio Grande do Sul, Brazil

Fabrício de Araújo Pedron, Antonio Carlos de Azevedo, Ricardo Simão Diniz Dalmolin, Sidinei Leandro Klockner Stürmer, Fábio Pacheco Menezes


The soil types Neossolos Litólicos (Leptosols) and Neossolos Regolíticos (Regosols) have been poorly studied in Brazil, due to their relatively low potential for agricultural use. Consequently the morphological description of Neossolos in the field is also hampered, particularly in terms of contacts between soil, saprolite and rock, and their classification in the Brazilian Soil Classification System. The purpose of this study was: to define morphologically the contact between soil, saprolite and rock in Neossolos; generate data of the saprolite layer […]