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8 results

Reference Values of Soil Quality for the Rio Doce Basin

Yang Zumbo Coronel Guevara, José João Lelis Leal de Souza, Gustavo Vieira Veloso, Renato Welmer Veloso, Pablo Azevedo Rocha, Walter Antônio Pereira Abrahão, [...]


ABSTRACT: The great geological and soil variation in the state of Minas Gerais, Brazil, indicates the need for regional studies to understand the geochemical background of soils. The Rio Doce Basin became a priority area for geochemical background determination after the rupture of the tailings dam of Fundão in 2015. In this context, the objectives of this study were to propose Reference Values of Soil Quality in the Rio Doce Basin, to define variables that can predict metal(loid) concentrations in […]

Tolerance to and Accumulation of Cadmium, Copper, and Zinc by Cupriavidus necator

Rayssa Pereira Vicentin, Jessé Valentim dos Santos, Cláudia Regina Gontijo Labory, Amanda Monique da Costa, Fatima Maria de Souza Moreira, Eduardo Alves


ABSTRACT Preliminary results of in vitro experiments with multicontaminated soils and solid media indicated that nodulating diazotrophic bacteria of the genus Cupriavidus are promising for the remediation of contaminated environments due to their symbiosis with legumes and metal tolerance. Thus, strains of Cupriavidus spp. (LMG 19424T, UFLA 01-659, UFLA 01-663, and UFLA 02-71) were tested for their ability to tolerate and bioaccumulate cadmium (Cd), copper (Cu), and zinc (Zn) in Luria-Bertani broth. Changes in the growth pattern of Cupriavidus strains […]

Geochemical Signature of Amazon Tropical Rainforest Soils

José João Lelis Leal de Souza, Maurício Paulo Ferreira Fontes, Robert Gilkes, Liovando Marciano da Costa, Teogenes Senna de Oliveira


ABSTRACT: Evaluating soil geochemical diversity in the Amazon Basin has been a challenge largely because most study sites have been at the edge of the basin and it is difficult to get samples in such a region. Here we show that even among the most weathered soils, physicochemical soil properties express lithology. Our results are based on topsoil samples collected from different locations in minimally disturbed areas in the state of Amazonas, Brazil. Soil properties were measured using methods which […]

Natural Fertility and Metals Contents in Soils of Rio Grande do Sul (Brazil)

Daiana Althaus, Clesio Gianello, Marino José Tedesco, Kelly Justin da Silva, Carlos Alberto Bissani, Regina Felisberto


ABSTRACT: The parent geological materials and formation factors influence the chemical, physical, and mineralogical properties and composition of the soil. Therefore, the aims of this study were to determine the chemical and some physical and mineralogical properties of the soil useful for agricultural practice; to determine the natural contents of the semitotal metals in soils of the state of Rio Grande do Sul (Brazil); and to suggest use of the quality reference values (QRVs) in accordance with Resolution 420/2009 of […]

Genesis, Characterization, and Classification of Mangrove Soils in the Subaé River Basin, Bahia, Brazil

Marcela Rebouças Bomfim, Jorge Antonio Gonzaga Santos, Oldair Vinhas Costa, Xosé Luis Otero, Geraldo da Silva Vilas Boas, Valdinei da Silva Capelão, [...]


ABSTRACT Preservation of mangroves, a very significant ecosystem from a social, economic, and environmental viewpoint, requires knowledge on soil composition, genesis, morphology, and classification. These aspects are of paramount importance to understand the dynamics of sustainability and preservation of this natural resource. In this study mangrove soils in the Subaé river basin were described and classified and inorganic waste concentrations evaluated. Seven pedons of mangrove soil were chosen, five under fluvial influence and two under marine influence and analyzed for […]

Growth of Bt Transgenic and Non-transgenic Corn Inoculated with Mycorrhizal Fungi in Soil Contaminated by Cadmium

Ana Paula Del Ducca, Eliane Guimarães Pereira Melloni, Rogério Melloni, Fabrina Bolzan Martins


ABSTRACT Population growth increases the need for food production, coupled in may cases with the indiscriminate use of fertilizers and incorporation of transgenic plants in the production system. The objective of this study was to evaluate the effect of cadmium on the growth of Bt transgenic corn and non-transgenic corn, inoculated with mycorrhizal fungi under controlled conditions. For that purpose, an experiment was set up in a 5 × 4 × 2 factorial arrangement with five Cd rates (0, 28.5, […]


Mara Lucia Jacinto Oliveira, Ademir Sérgio Ferreira de Araujo, Wanderley José de Melo


Tannery sludge contains high concentrations of inorganic elements, such as chromium (Cr), which may lead to environmental pollution and affect human health The behavior of Cr in organic matter fractions and in the growth of cowpea (Vigna unguiculata L.) was studied in a sandy soil after four consecutive annual applications of composted tannery sludge (CTS). Over a four-year period, CTS was applied on permanent plots (2 × 5 m) and incorporated in the soil (0-20 cm) at the rates of […]


Airon José da Silva, Clístenes Williams Nascimento, Artur da Silva Gouveia Neto, Elias Arcanjo Silva Junior


Arsenic is a metalloid highly toxic to plants and animals, causing reduced plant growth and various health problems for humans and animals. Silicon, however, has excelled in alleviating stress caused by toxic elements in plants. The aim of this study was to investigate the effects of Si in alleviating As stress in maize plants grown in a nutrient solution and evaluate the potential of the spectral emission parameters and the red fluorescence (Fr) and far-red fluorescence (FFr) ratio obtained in […]