118 results

Micromorphology and Genesis of Soils from Topolitosequences in the Brazilian Central Plateau

Fernando Cartaxo Rolim Neto ORCID logo , Carlos Ernesto Gonçalves Reynaud Schaefer ORCID logo , Danilo de Lima Camêlo ORCID logo , Marcelo Metri Corrêa ORCID logo , Roberto da Boa Viagem Parahyba ORCID logo , Anildo Monteiro Caldas ORCID logo , [...]

04/Sep/2019

ABSTRACT The micromorphology of deeply weathered soils (Ferralsols/ Latossolos ) from the Central Plateau of Brazil remains little studied, and its affiliation to different parent materials, poorly known. To clarify the processes of soil formation of these acric, gibbsitic, Fe-oxide rich Ferralsols, three lithotoposequences on local ultrabasic to basic intrusive rocks were studied. The influences of mixing and pedobioturbation are evident in all soils, and Ferralsols of the Central Plateau of Brazil are polygenetic, based on the coarse mineral composition, […]

Visual Abstract

Relief Position and Soil Properties under Continuous Banana Cropping in Subhumid Climate in Northeast Brazil

Maria da Conceição de Almeida ORCID logo , Jane Kelly Silva Araujo ORCID logo , Mateus Rosas Ribeiro Filho ORCID logo , Valdomiro Severino de Souza Júnior ORCID logo

20/Aug/2019

ABSTRACT Sequences of thick and eroded soils in hills surfaces are cultivated with banana since the beginning of the last century in the Northeast of Pernambuco (PE), Brazil. Measurements of soil properties depending on soil slope under intensive agricultural cultivation are limited mostly as the pedogenetic approach. This study aimed to identify the dominant soil types, to evaluate morphological, physical, chemical, and mineralogical properties of soil profiles, and link them to the relief position under continuous banana cropping, in the […]

Visual Abstract

A Regional Legacy Soil Dataset for Prediction of Sand and Clay Content with Vis-Nir-Swir, in Southern Brazil

Elisângela Benedet Silva ORCID logo , Élvio Giasson ORCID logo , André Carnieletto Dotto ORCID logo , Alexandre ten Caten ORCID logo , José Alexandre Melo Demattê ORCID logo , Ivan Luiz Zilli Bacic ORCID logo , [...]

12/Aug/2019

ABSTRACT The success of soil prediction by VIS-NIR-SWIR spectroscopy has led to considerable investment in large soil spectral libraries. The aims of this study were 1) to develop a soil VIS-NIR-SWIR spectroscopy approach using legacy soil samples to improve spectral soil information in a regional scale; (2) to compare six spectral preprocessing techniques; and (3) to compare the performance of linear and non-linear multivariate models for prediction of sand and clay content. A total of 1,534 legacy soil samples, stored […]

Visual Abstract

AlradSpectra: a Quantification Tool for Soil Properties Using Spectroscopic Data in R

André Carnieletto Dotto ORCID logo , Ricardo Simão Diniz Dalmolin ORCID logo , Alexandre ten Caten ORCID logo , Diego José Gris ORCID logo , Luis Fernando Chimelo Ruiz ORCID logo

23/Jul/2019

ABSTRACT Soil reflectance spectroscopy has become an innovative method for soil property quantification supplying data for studies in soil fertility, soil classification, digital soil mapping, while reducing laboratory time and applying a clean technology. This paper describes the implementation of a Graphical User Interface (GUI) using R named AlradSpectra. It contains several tools to process spectroscopic data and generate models to predict soil properties. The GUI was developed to accomplish tasks such as perform a large range of spectral preprocessing […]

Visual Abstract

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

19/Jun/2019

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 […]

Visual Abstract

Field Description and Identification of Diagnostic Qualifiers for Urban Soils in Brazil

Jéssica Rafaela da Costa ORCID logo , Fabrício de Araújo Pedron ORCID logo , Ricardo Simão Diniz Dalmolin ORCID logo , Ricardo Bergamo Schenato ORCID logo

14/Jun/2019

ABSTRACT Human activities often alter soils found in urban areas. These alterations affect their environmental functions and potential for use. However, soils from urban areas in Brazil have not been surveyed and identified, which can pose a technical problem for the development of the city. Considering the importance of urban environments and their soils, this study aimed to evaluate the environmental and morphological characteristics and the physical properties of urban soils in Santa Maria, Rio Grande do Sul, Brazil. The […]

Genesis and Classification of Nitisols from Volcano-Sedimentary Lithology in Northeastern Brazil

Edivan Uchôa Cavalcanti da Costa, Jane Kelly Silva Araujo, Laércio Vieira de Melo Wanderley Neves, José Coelho de Araújo Filho, Juliet Emília Santos de Sousa, Marcelo Metri Corrêa, [...]

06/Feb/2019

ABSTRACT On the southern coast of Pernambuco State (PE), Brazil, lithotypes of the Cabo Basin (volcanic and sedimentary rocks), in association with the relief, allow the determination of the dynamics of the formation of Nitossolos Háplicos (Nitisols), including those with high levels of exchangeable aluminum. The objective of this study was to evaluate the influence of lithological diversity (basalt and sedimentary siliciclastic rocks) on the morphological, physical, chemical, and mineralogical properties of Nitossolos Háplicos along a slope (P1-summit, P2-backslope, P3-footslope) […]

Multivariate Analysis and Machine Learning in Properties of Ultisols (Argissolos) of Brazilian Amazon

Cristiano Marcelo Pereira de Souza, André Thomazini, Carlos Ernesto Gonçalves Reynaud Schaefer, Gustavo Vieira Veloso, Guilherme Musse Moreira, Elpídio Inácio Fernandes Filho

26/Nov/2018

ABSTRACT: Ultisols are the most common soil order in the Brazilian Amazon. The Legal Amazon (LA) has an area of 5 × 106 km2, with few accessible areas, which restricts studies of soils at a detailed level. The pedological properties can be estimated more efficiently using statistical procedures and machine learning techniques, tools which are capable of recognizing patterns in a large soil database. We analyzed the main chemical and physical properties of the B horizons of the Ultisols of […]

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Edaphic and Topographic Factors and their Relationship with Dendrometric Variation of Pinus Taeda L. in a High Altitude Subtropical Climate

Taciara Zborowski Horst, Ricardo Simão Diniz Dalmolin, Alexandre ten Caten, Jean Michel Moura-Bueno, Luciano Campos Cancian, Fabrício de Araújo Pedron, [...]

26/Nov/2018

ABSTRACT The study of the relationships between the yield potential of forest stands and the conditions offered for plant development is fundamental for the adequate management of the forest when aiming at sustainable high yields. However, these relations are not clear, especially in commercial forests, on rugged terrain where relationships between the landscape, soil, and plants are more complex. Considering this, we tested the hypothesis that the morphological aspects of the soil conditioned by topography are the main limiting factors […]

Visual Abstract

Selection of Environmental Covariates for Classifier Training Applied in Digital Soil Mapping

Alcinei Ribeiro Campos, Elvio Giasson, José Janderson Ferreira Costa, Israel Rosa Machado, Elisângela Benedet da Silva, Benito Roberto Bonfatti

26/Nov/2018

ABSTRACT A large number of predictor variables can be used in digital soil mapping; however, the presence of irrelevant covariables may compromise the prediction of soil types. Thus, algorithms can be applied to select the most relevant predictors. This study aimed to compare three covariable selection systems (two filter algorithms and one wrapper algorithm) and assess their impacts on the predictive model. The study area was the Lajeado River Watershed in the state of Rio Grande do Sul, Brazil. We […]

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