40 results

Chemical and mineralogical constitution of redoximorphic features and mechanism of formation of Plinthosols from the Araguaia River plain, Brazil

Djavan Pinheiro Santos ORCID logo , Glenio Guimarães Santos ORCID logo , Virlei Álvaro de Oliveira ORCID logo , Gustavo Cassiano da Silva ORCID logo , Rilner Alves Flores ORCID logo , Antônio Carlos Azevedo ORCID logo , [...]

11/Oct/2024

ABSTRACT Currently in Brazil, large grain cultivation projects on Plinthosols are a reality, however, there is little or no knowledge of the real mechanism of formation of the plinthite feature, in addition to what is reported in the literature as being a product of oxidation-reduction processes of iron element. This study evaluates iron redoximorphic features and investigates their chemical and mineralogical composition in two profiles of Plinthosols from the Araguaia River plain (P1 and P2). The study strengthens the understanding […]

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Microstructural changes in Oxisols under long-term different management systems

Aristides Osvaldo Ngolo ORCID logo , Fábio Soares de Oliveira ORCID logo , Maurílio Fernandes de Oliveira ORCID logo , Raphael Bragança Alves Fernandes ORCID logo

28/Nov/2023

ABSTRACT There has long been a discussion about the effects of soil management on its structure. Since changes can occur due to management and time of use, more accurate assessments can be achieved if carried out in long-term experiments. This study investigated the long-term effects of soil management on the physical quality of a Cerrado Oxisol (Latossolo Vermelho), focusing on microstructural changes. Micromorphology and computed tomography techniques were used to assess the soil’s microstructure. The study compared areas under long-term […]

Identification of plinthite or saprolite residue in soils with high textural contrast in the southern Brazil

Mariana Rigueira da Costa Pereira ORCID logo , Fabrício de Araújo Pedron ORCID logo , Ricardo Simão Diniz Dalmolin ORCID logo , Ricardo Bergamo Schenato ORCID logo , José Eduardo Dias Alves ORCID logo

12/Dec/2022

ABSTRACT Soils classified as Alisols are very frequent in the sedimentary agricultural areas of southern Brazil. The presence of red mottles with morphology similar to plinthite and saprolite residue is very common in these soils, and its identification can be considered a difficult task, both in the field and in the laboratory. The incorrect identification of these redoximorphic features can affect soils’ taxonomic and technical classification. We aimed to compare morphological, physical, chemical and mineralogical data to identify reddish mottles, […]

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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 […]

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Soil characterization and drainage effects in a savanna palm swamp (vereda) of an agricultural area from Central Brazil

Ingrid Horák-Terra ORCID logo , Fabrício da Silva Terra ORCID logo , Adrieny Kerollen Alves Lopes ORCID logo , Leonardo Barros Dobbss ORCID logo , Ademir Fontana ORCID logo , Alexandre Christófaro Silva ORCID logo , [...]

21/Mar/2022

ABSTRACT Brazilian palm swamps (veredas) are fundamentals in the hydrological balance of watercourses in the Brazilian savanna (Cerrado). The “sponge effect” of their soils is the main factor controlling local hydrology, storing rainwater, and functioning as headwaters. The restricted knowledge of these tropical ecosystems has led to increased losses, poor preservation, and reduction in their ecosystem services. Veredas have become refuges surrounded by croplands, often drained and inappropriately managed. This study shows the impacts of anthropization on soil processes and […]

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Urban soils in Brazil: A review

Sheila Aparecida Correia Furquim ORCID logo , Ícaro Sena Almeida ORCID logo

14/Mar/2022

ABSTRACT This study analyzes the scientific production about soils within cities in Brazil, the most populous country of Latin America, to highlight significant patterns and contributions and point out gaps and future challenges. A more robust literature about urban soils in Brazil started in the 90´s decade and has intensified since 2015. Papers are mostly published in Portuguese, majority performed in cities with more than 500,000 inhabitants, many of them located in the Southern and Southeastern regions, and mainly focused […]

Soils with dark subsurface horizons in saline basins in the Brazilian Pantanal

Andressa Rosas de Menezes ORCID logo , Ademir Fontana ORCID logo , Lúcia Helena Cunha dos Anjos ORCID logo , Marcos Gervasio Pereira ORCID logo , Jolimar Antônio Schiavo ORCID logo

04/Mar/2022

ABSTRACT Soils in the Brazilian Pantanal classified as Espodossolos and registered in the literature diverge from the central concept of pedogenesis by podzolization, especially due to the high values of pH and basic cations, although the morphology is similar to that of spodic horizons. In this sense, this study hypothesized that the neutral to alkaline conditions along the edges of the saline basins in the Lower Nhecolândia region do not inhibit the podzolization process nor the development of spodic soils. […]

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Teaching soil science: The impact of laboratory and field components on the knowledge and attitude toward soil

Alexander Neaman ORCID logo , Christian Stange ORCID logo , Sarah Zabel ORCID logo , Tatiana M. Minkina ORCID logo , Carolina Yáñez ORCID logo , Elliot Burnham ORCID logo , [...]

24/Nov/2021

ABSTRACT The concept of attitude toward soil is emerging, with a slim choice of scales available to collect hard data. There is also a dearth of standard scales to acquire precise data on students’ knowledge of soil. Therefore, the objectives of the present study were: (1) to devise appropriate scales to quantify theoretical soil knowledge and attitude toward soil, and (2) to quantify the effect of laboratory studies and fieldwork on students’ theoretical soil knowledge and attitude toward soil. The […]

Epi and endosaturation affecting redoximorphic features and pedogenesis in subtropical soils with high textural contrast developed from sedimentary rocks

Jaime Antonio de Almeida ORCID logo , Pablo Grahl dos Santos ORCID logo

11/Nov/2021

ABSTRACT Soils in the Depressão Central and Campanha Gaúcha in Rio Grande do Sul State, Brazil, developed from sedimentary rocks are mainly Alfisols (Luvissolos, Planossolos and Plintossolos) and Ultisols (Argissolos) with high textural contrast between A and/or E horizons and clayey B horizons. Red Ultisols dominate in well-drained areas in the summit. But many soils present redoximorphic features on the backslope and footslope, with mottled and/or nodules similar to plinthite due to the oscillating of the water table above the […]

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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. […]

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