Consulta: subjectFacets:"Pyrogenic carbon"
Registros recuperados: 7
Data/hora: 09/06/2024 10:47:33

Reproducing the organic matter model of anthropogenic dark earth of Amazonia and testing the ecotoxicity of functionalized charcoal compounds
Provedor de dados: 86
Autores: Linhares,Carolina Rodrigues; Lemke,Jasmin; Auccaise,Ruben; Duó,Daniele Avilez; Ziolli,Roberta Lourenço; Kwapinski,Witold; Novotny,Etelvino Henrique.
The objective of this work was to obtain organic compounds similar to the ones found in the organic matter of anthropogenic dark earth of Amazonia (ADE) using a chemical functionalization procedure on activated charcoal, as well as to determine their ecotoxicity. Based on the study of the organic matter from ADE, an organic model was proposed and an attempt to reproduce it was described. Activated charcoal was oxidized with the use of sodium hypochlorite at different concentrations. Nuclear magnetic resonance was performed to verify if the spectra of the obtained products were similar to the ones of humic acids from ADE. The similarity between spectra indicated that the obtained products were polycondensed aromatic structures with carboxyl groups: a soil...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Daphnia similis; Biochar; Chemical oxidation; Fractionation of humic substances; Nuclear magnetic resonance; Pyrogenic carbon.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2012000500009

Relationship between soil oxidizable carbon and physical, chemical and mineralogical properties of umbric ferralsols
Provedor de dados: 90
Autores: Marques,Flávio Adriano; Calegari,Márcia Regina; Vidal-Torrado,Pablo; Buurman,Peter.
The occurrence of Umbric Ferralsols with thick umbric epipedons (&amp;gt; 100 cm thickness) in humid Tropical and Subtropical areas is a paradox since the processes of organic matter decomposition in these environments are very efficient. Nevertheless, this soil type has been reported in areas in the Southeast and South of Brazil, and at some places in the Northeast. Aspects of the genesis and paleoenvironmental significance of these Ferralsols still need a better understanding. The processes that made the umbric horizons so thick and dark and contributed to the preservation of organic carbon (OC) at considerable depths in these soils are of special interest. In this study, eight Ferralsols with a thick umbric horizon (UF) under different vegetation types...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ferralsols; Tropical soils; Soil total carbon; Soil organic carbon; Pyrogenic carbon; Soil charcoal; Umbric epipedon.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000100003

Biochar: Agronomic and environmental potential in Brazilian savannah soils
Provedor de dados: 91
Autores: Petter,Fabiano A.; Madari,Beata E.
Due to the high activity of microorganisms, the loss of soil organic matter is high in tropical regions. This loss becomes even greater if the soil is managed improperly or when there is no technology that leverages the permanence of the soil carbon by maintaining appropriate levels of organic matter, providing chemical, physical and biological soil improvements and contributing to reduce CO2 emissions to the atmosphere. Due to its aromatic structure, biochar is a highly stable form of carbon in the soil that may contribute to the reduction of greenhouse gas emissions, such as CO2, N2O and CH4, and act as a soil conditioner, improving the physical and chemical properties of the soil. Biochar may also result in increased productivity due to the improvement...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pyrogenic carbon; Fertility; Yield; Greenhouse gas emission.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662012000700009

Forms of soil organic phosphorus at black earth sites in the Eastern Amazon
Provedor de dados: 124
Autores: Costa,Adriane da Rocha; Silva Júnior,Mário Lopes; Kern,Dirse Clara; Ruivo,Maria de Lourdes Pinheiro; Marichal,Raphaël.
ABSTRACT Soils containing archaeological black earth (ABE) are formed by the continuous deposition of organic residue, and maintain their high fertility even after years of cultivation. The aim of this study was to characterise and quantify the forms of organic phosphorus in areas of archaeological black earth (ABE), with a view to understanding the dynamics of the element and contributing to the development of sustainable practices of land use. Samples of 10 profiles were used from Latosols, Argisols and Gleysols located in the eastern Amazon with an anthropogenic A-horizon (ABE), using adjacent, non-anthropogenic soils as reference. The samples relative to the A, transitional and B-horizons, were subjected to sequential fractionation of P in an acid base...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sequential fractionation; Anthropogenic soils; Labile phosphorus; Pyrogenic carbon.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902017000100001

Sorption and desorption of diuron in Oxisol under biochar application
Provedor de dados: 53
Autores: Petter,Fabiano André; Ferreira,Tamara Santos; Sinhorin,Adilson Paulo; Lima,Larissa Borges de; Morais,Leidimar Alves de; Pacheco,Leandro Pereira.
ABSTRACT The objective of this study was to verify the kinetics of sorption and desorption of diuron in an Oxisol under application of biochar. The samples were collected in a field experiment conducted in randomized design blocks consisted of 2 base fertilization levels (0 and 400 kg∙ha−1 NPK 00-20-20 fertilizer formula) and 3 doses of biochar (0, 8 and 16 Mg∙ha−1). In the evaluation of sorption and desorption, Batch Equilibrium method was used. The kinetics of sorption and desorption of diuron, total organic carbon, fulvic acid, humic acid and humin, pH and partition coefficient to organic carbon were evaluated. The Freundlich isotherm was adjusted appropriately to describe diuron sorption kinetics in all the studied treatments. The application of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leaching; Persistence; Soil organic matter; Herbicide; Pyrogenic carbon.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052016000400487

Nitrogen and phosphorus uptake efficiency in Indian mustard cultivated during three growth cycles in a copper contaminated soil treated with biochar
Provedor de dados: 65
Autores: Gonzaga,Maria Isidória Silva; Souza,Danyelle Chaves Figueiredo de; Almeida,André Quintão de; Mackowiak,Cheryl; Lima,Idamar da Silva; Santos,José Carlos de Jesus; Andrade,Raquel Santos de.
ABSTRACT:  Biochar has been used worldwide as an efficient soil amendment due to its beneficial interaction with soil particles and nutrients; however, studies on the effect of biochar on the availability of nutrients such as N and P in tropical soils are still missing. The objective of the study was to evaluate the effect of different types and doses of biochars on the concentration and uptake of N and P in Indian mustard plants (Brassica juncea L.) grown in a Cu contaminated soil during three successive growth cycles. The greenhouse experiment was set up as randomized block design in a 3x3 factorial scheme, with 3 types of biochars (coconut shell, orange bagasse and sewage sludge) and three rates of application (0, 30 and 60t ha-1), and 4 replicates....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biochar; Pyrogenic carbon; Copper contamination; Plant nutrition; Brassica juncea.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019000100250

Potential impacts of using sewage sludge biochar on the growth of plant forest seedlings
Provedor de dados: 65
Autores: Silva,Maria Isidoria; Mackowiak,Cheryl; Minogue,Patrick; Reis,Alessandra Ferreira; Moline,Ederlon Flavio da Veiga.
ABSTRACT: Sewage sludge has long been successfully used in the production of nursery plants; however, some restriction may apply due to its high pathogenic characteristics. The process of charring the organic waste significantly reduces that undesired component and may be as effective as the non-charred residue. The aim of this study was to evaluate the effect of sewage sludge biochar on the growth and morphological traits of eucalyptus ( Eucalyptus grandis L.) seedlings, and compare results with those observed when using uncharred sewage sludge. Treatments were arranged in a completely randomized design, in a 2 x 2 factorial scheme, with four replications. Charred and non-charred sewage sludge were tested with and without NPK addition. A control treatment...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biosolids; Pyrogenic carbon; Environmental management.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000100401