40 results

Genesis and Classification of Soils from Subtropical Mountain Regions of Southern Brazil

Denilson Dortzbach, Marcos Gervasio Pereira, Lúcia Helena Cunha dos Anjos, Ademir Fontana, Eduardo de Carvalho Silva

17/Oct/2016

ABSTRACT Soils formed in high mountainous regions in southern Brazil are characterized by great accumulation of organic matter (OM) in the surface horizons and variation in the degree of development. We hypothesized that soil properties and genesis are influenced by the interaction of parent materials and climate factors, which differ depending on the location along the altitudinal gradient. The goal of this study was to characterize and classify the soil, evaluate soil distribution, and determine the interactive effects of soil-forming […]

Genesis and Classification of Soils Containing Carbonates in a Toposequence of the Bambuí Group

Deyvid Diego Carvalho Maranhão, Marcos Gervasio Pereira, Leonardo Santos Collier, Lúcia Helena Cunha dos Anjos, Antonio Carlos Azevedo, Rafael de Souza Cavassani

23/Aug/2016

ABSTRACT The Bambuí Group, formed from siliciclastic sediments deposited on an extensive epicontinental platform at the end of the Neoproterozoic era, is characterized by limestones with fine to very fine texture. Limestone-derived soils in the southeast of Tocantins state, Brazil, are less notorious than similar soils in other regions of Brazil and their characterization could contribute to the Brazilian System for Soil Classification (SiBCS). Given that little is known of these soils, despitetheir agricultural potential, the objective of this study […]

Genesis of Soils Formed from Mafic Igneous Rock in the Atlantic Forest Environment

Adailde do Carmo Santos, Marcos Gervasio Pereira, Lúcia Helena Cunha dos Anjos, Thiago Andrade Bernini, Miguel Cooper

06/Jun/2016

ABSTRACT Different parent materials participate in the formation of soils in the hilly landscape of “Mar de Morros” in the Atlantic Forest environment. Those derived from mafic igneous rock (gabbro) frequently show erosion problems because of land use, which is aggravated by the mountainous relief and soil attributes. This study evaluated the main pedogenic processes of soils formed from mafic igneous rock (gabbro) in a toposequence in Pinheiral (RJ) by characterizing physical, chemical, mineralogical and micromorphological attributes. The profiles are […]

Physical, Macro- and Micromorphological Properties of Regosols in the Agreste Meridional Region of Pernambuco, Brazil

Alison Van Der Linden de Almeida, Marcelo Metri Corrêa, José Romualdo de Sousa Lima, Eduardo Soares de Souza, Kleber Régis Santoro, Antonio Celso Dantas Antonino

01/Sep/2015

ABSTRACT Regosols in the Agreste Meridional region of Pernambuco, Brazil, are used for various agricultural activities, and prominent among them is production of common bean. An expressive variation is perceived in common bean crop yield, possibly associated with the presence of lamellae, which make for distinct water fluxes among these soils. The objective was to analyze the macro- and micromorphological, and physical characteristics of the Regosols located in the Agreste Meridional region of Pernambuco to understand the water fluxes in […]

IRON, SILICON, OR ALUMINUM FORMS, OR THEIR COMBINATION, IN THE GENESIS OF FRAGIPANS AND COHESIVE HORIZONS OF COASTAL TABLELANDS

Marcelo Metri Corrêa, João Carlos Ker, José Coelho de Araújo, Danilo de Lima Camêlo

01/Jul/2015

In the geomorphological unit of the Coastal Tablelands of Brazil there is a predominance of cohesive soil horizons and some with the presence of cemented horizons, commonly of the fragipan type. These horizons interfere with water dynamics, root growth, and, consequently, mineral nutrition of plants. The objective of this study was to use selective dissolution to evaluate the participation of forms of Fe, Si, or Al, or their combination, in the cohesion or cementation or both of fragipans and cohesive […]

Planosols and Gleysols Used in the Manufacture of Handcrafted Pottery in the Semiarid Region of Minas Gerais

Diana Ferreira de Freitas, João Carlos Ker, Raphael Bragança Alves Fernandes, Maurício Paulo Ferreira Fontes

01/May/2015

Ethnopedological knowledge has provided important information about the way of life of rural people and their traditions, like the craft of making pieces of pottery from suitable soils. The objective of this study was to evaluate the physical, chemical, and mineralogical properties of Planosols and Gleysols used in the production of handcrafted pottery artifacts in the State of Minas Gerais, Brazil. In the clay pits, two profiles of Planosol soil (P1 and P2) and one of Gleysol soil (P3) used […]

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 […]

INTERNAL STRUCTURE OF A VERMICULAR IRONSTONE AS DETERMINED BY X-RAY COMPUTED TOMOGRAPHY SCANNING

Yuri Lopes Zinn, Carla Eloize Carducci, Marla Alessandra Araujo

01/Mar/2015

Ironstones or petroplinthites are common materials in soils under humid tropical climate, generally defined as the result of Fe oxide accumulation in areas where the water table oscillates, and may exhibit considerable morphological variability. The aim of this study was to examine the internal structure and porosity of an ironstone fragment from a Petroferric Acrudox in Minas Gerais, Brazil, by computed tomography (CT) and conventional techniques. The sample analyzed had total porosity of 59.5 %, with large macropores in the […]

Mineral assemblage of soils developed from different lithologies in southern Minas Gerais, Brazil

Marla Alessandra Araujo, Alessandro Vitor Pedroso, Douglas Carvalho Amaral, Yuri Lopes Zinn

01/Feb/2014

Systematic studies on of soil formation factors are relatively scarce in Brazil since comprehensive samplings of a variable factor while keeping others constant are difficult to perform. Near Lavras, Minas Gerais, there is wide geological diversity over a small area, which offers a chance to assess the control exerted by different lithologies on mineral suites and other soil properties. Thus, eight soils overlying quartzite, mica-schist, gabbro, itabirite, serpentinite, meta-limestone, gneiss and phyllite, under similar climate and tropical, semideciduous forest conditions […]

Experimental use of ground-penetrating radar (GPR) to investigate tablelands in the northern coast of Bahia, Brazil

J. M. Ucha, M. Botelho, G. S. Vilas Boas, L. P. Ribeiro, P. S. Santana

01/Jun/2002

Nine profiles were studied along a toposequence developed on Barreiras Group sediments, in Fazenda Rio Negro, Entre Rios, Bahia, Brazil. Besides conventional analysis, an electromagnetic probe through GPR – Ground-Penetrating Radar was employed. The objective of this study was to analyze the use of this tool in the acquisition of information on features occurring underground, by comparing the radargrams and pedologic descriptions obtained in the area. The equipment used was a Geophysical Survey model, with an 80 MHz antenna. The […]

1 2 3 4