20 results

Gypsic soils in the Brazilian Semiarid

Artur Henrique Nascimento da Silva ORCID logo , Marilya Gabryella Sousa ORCID logo , José Coelho de Araújo Filho ORCID logo , Marcelo Metri Corrêa ORCID logo , Xose Lois Otero ORCID logo , Tiago Osório Ferreira ORCID logo , [...]

19/Mar/2025

ABSTRACT Globally, soils with gypsic horizons cover approximately 1 million km², predominantly in arid climates. The formation of pedogenic gypsum in soils has been a topic of discussion in pedological studies for some time, with gypsification representing the process responsible for secondary gypsum accumulation. Even though international classification systems acknowledge the existence of gypsic horizons, there is a paucity of documented evidence concerning their occurrence in Brazilian soils. This study aimed to identify and describe a soil with secondary gypsum […]

Visual Abstract

Genesis and transformation of basic rock-derived soils with shiny ped faces under tropical conditions

Marcos Gervasio Pereira ORCID logo , Rafael Cipriano da Silva ORCID logo , Miguel Cooper ORCID logo , Lúcia Helena Cunha dos Anjos ORCID logo , Deyvid Diego Carvalho Maranhão ORCID logo , Fábio Soares de Oliveira ORCID logo

04/Oct/2022

ABSTRACT Soil evolves in landscapes in a natural process in which soil properties are gradually transformed. However, the transformation of argic to ferralic horizons in basic rock-derived soils under tropical conditions is poorly understood. Depending on the position of the soil profiles in landscape, evidence of pedogenetic transformation between different horizons might indicate the formation and destruction of aggregates with shiny faces. This study aimed to determine pedogenetic changes in basic rock-derived profiles in a toposequence, because soils derived from […]

Visual Abstract

Calcination as an alternative method to classify Spodosols on the second categorical level

Daniel Alexandre Heberle ORCID logo , Jaime Antonio de Almeida ORCID logo , Pablo Vidal Torrado ORCID logo

11/Nov/2020

ABSTRACT The classification of Spodosols on the second categorical level (suborder), according to the Brazilian Soil Classification System (SiBCS), is done by observing the colors of genetic horizons in the field. The presence or absence of iron oxides is the main factor for this classification, and the color of the horizon is the criterion currently adopted. However, the simple observation of color in the field can be mistaken and cause an error in the definition of the second categorical level. […]

Digital Soil Mapping Using Machine Learning Algorithms in a Tropical Mountainous Area

Martin Meier, Eliana de Souza, Marcio Rocha Francelino, Elpídio Inácio Fernandes Filho, Carlos Ernesto Gonçalves Reynaud Schaefer

02/Nov/2018

ABSTRACT: Increasingly, applications of machine learning techniques for digital soil mapping (DSM) are being used for different soil mapping purposes. Considering the variety of models available, it is important to know their performance in relation to soil data and environmental variables involved in soil mapping. This paper investigated the performance of eight machine learning algorithms for soil mapping in a tropical mountainous area of an official rural settlement in the Zona da Mata region in Brazil. Morphometric maps generated from […]

Visual Abstract

Characteristics of Soils in Highland Wetlands as a Subsidy to Identifying and Setting their Limits

Maria Tereza Warmling, Jackson Adriano Albuquerque, Jaime Antonio de Almeida, Maria Izabel Warmling

09/Mar/2017

ABSTRACT Palustrine areas and wetlands in particular are fragile ecosystems, with high biodiversity and high ecological productivity, and they provide benefits to society. The aim of this study was to describe and classify the main soils occurring in the wetlands of the Southern Plateau of Santa Catarina, and propose criteria for identification of hydromorphic environments as an aid in demarcation of their boundaries. Soils of four wetlands, in the municipalities of Bom Jardim da Serra, Bom Retiro, Lages, and Painel […]

Characterization and Classification of Soils under Forest and Pasture in an Agroextractivist Project in Eastern Amazonia

Mariana Delgado Oliveira Zenero, Laura Fernanda Simões da Silva, Selene Cristina de Pierri Castilho, Alix Vidal, Michel Grimaldi, Miguel Cooper

09/Dec/2016

ABSTRACT: Knowledge of soils in the Amazon rainforest is becoming increasingly essential due to dynamics adopted by farmers that substitute forest for pastures, together with growing pressure from diverse segments of society towards adoption of sustainable production systems. The objective of this study was to characterize the soils along two toposequences, one under forest (F) and the other under pasture (P), and to verify how the change in land use influences soil attributes, evaluating their inclusion in the Brazilian Soil […]

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

01/May/2015

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 […]

Using numerical classification of profiles based on Vis-NIR spectra to distinguish soils from the Piracicaba Region, Brazil

Rodnei Rizzo, José A. M. Demattê, Fabrício da Silva Terra

01/Apr/2014

Considering that information from soil reflectance spectra is underutilized in soil classification, this paper aimed to evaluate the relationship of soil physical, chemical properties and their spectra, to identify spectral patterns for soil classes, evaluate the use of numerical classification of profiles combined with spectral data for soil classification. We studied 20 soil profiles from the municipality of Piracicaba, State of São Paulo, Brazil, which were morphologically described and classified up to the 3rd category level of the Brazilian Soil […]

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

01/Dec/2010

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 […]

Soil spectral library and its use in soil classification

Henrique Bellinaso, José Alexandre Melo Demattê, Suzana Araújo Romeiro

01/Jun/2010

Soil science has sought to develop better techniques for the classification of soils, one of which is the use of remote sensing applications. The use of ground sensors to obtain soil spectral data has enabled the characterization of these data and the advancement of techniques for the quantification of soil attributes. In order to do this, the creation of a soil spectral library is necessary. A spectral library should be representative of the variability of the soils in a region. […]

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