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Registros recuperados: 8
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Carbon distribution in humic substances fractions extracted from soils treated with charcoal (biochar). Repositório Alice
MADARI, B. E.; LIMA, L. B.; NOVOTNY, E. H.; ALCANTARA, F. A.; CARVALHO, M. T. M.; PETTER, F. A..
Tipo: Separatas Palavras-chave: Pyrogenic carbon; Quantification.; Biochar; Fulvic acids; Humic acids; Humin..
Ano: 2012 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/951540
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Carbon in humic fractions of organic matter in soil treated with organic composts under mango cultivation. Repositório Alice
SILVA, J. R.; SILVA, D. J.; GAVA, C. A. T.; OLIVEIRA, T. C. T. de; FREITAS, M. do S. C. de.
Soil organic matter (SOM) plays a key role in maintaining the productivity of tropical soils, providing energy and substrate for the biological activity and modifying the physical and chemical characteristics that ensure the maintenance of soil quality and the sustainability of ecosystems. This study assessed the medium-term effect (six years) of the application of five organic composts, produced by combining different agro-industrial residues, on accumulation and chemical characteristics of soil organic matter. Treatments were applied in a long-term experiment of organic management of mango (OMM) initiated in 2005 with a randomized block design with four replications. Two external areas, one with conventional mango cultivation (CMM) and the other a...
Tipo: Artigo de periódico Palavras-chave: Região semiárida; Ácidos húmico.; Manga; Solo; Composto orgânico; Mangifera Indica; Matéria Orgânica.; Humic acids; Fulvic acids.
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1048504
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Carbon in Humic Fractions of Organic Matter in Soil Treated with Organic Composts under Mango Cultivation Rev. Bras. Ciênc. Solo
Silva,Joyce Reis; Silva,Davi José; Gava,Carlos Alberto Tuão; Oliveira,Thaisi Caroline Tavares de; Freitas,Maria do Socorro Conceição de.
ABSTRACT Soil organic matter (SOM) plays a key role in maintaining the productivity of tropical soils, providing energy and substrate for the biological activity and modifying the physical and chemical characteristics that ensure the maintenance of soil quality and the sustainability of ecosystems. This study assessed the medium-term effect (six years) of the application of five organic composts, produced by combining different agro-industrial residues, on accumulation and chemical characteristics of soil organic matter. Treatments were applied in a long-term experiment of organic management of mango (OMM) initiated in 2005 with a randomized block design with four replications. Two external areas, one with conventional mango cultivation (CMM) and the other...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Humin; Humic acids; Fulvic acids; Semi-arid region of Brazil; Mangifera indica.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100406
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Chemical nature of soil humified fractions and their bioactivity PAB
Canellas,Luciano Pasqualoto; Façanha,Arnoldo Rocha.
The aim of this work was to evaluate the humus composition from an Ultisol from Campos dos Goytacazes, RJ, Brazil. Soil samples of four depths (0-0.05, 0.05-0.10, 0.10-0.20 and 0.20-0.40 m) and its chemical nature were analysed by elemental composition, E4/E6 ratios and Fourier transformed infrared spectroscopy. The bioactivity of these humified substances was evaluated through their action on maize root growth and H+-ATPase activity of roots microsomes. In topsoil, the content of high condensed alkaline soluble humic substances is greater than that found in the subsuperficial layers. The chemical nature of humic and fulvic acids also varied with the soil depth. The humic acids isolated from the soil samples exhibited higher bioactivity compared with the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fulvic acids; Humic acids; H+-ATPase.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2004000300005
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Contribution of humic substances from different composts to the synthesis of humin in a tropical soil Rev. Bras. Ciênc. Solo
Lima,Claudivan Costa; Mendonça,Eduardo de Sá; Roig,Asunción.
The contribution of humic substances of different composts to the synthesis of humin in a tropical soil was evaluated. Increasing doses (0, 13, 26, 52, and 104 Mg ha-1) of five different composts consisting of agroinpowderrial residues were applied to a Red-Yellow Latosol. These composts were chemically characterized and 13C NMR determined and the quantity of the functional alkyl groups of humic acids applied to the soil as compost was estimated. Thirty days after application of the treatments, organic matter samples were collected for fractionation of humic acids (HA), fulvic acids (FA) and humin (HU), from which the ratios HA/FA and (HA + FA)/HU were calculated. The application of the composts based on castor cake resulted in the highest HU levels in the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Humic acids; Fulvic acids; 13C NMR; Alkyl groups; Recalcitrance.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000400004
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Effects of physicochemical soil properties of five agricultural soils on herbicide soil adsorption and leaching Ciencia e Investigación Agraria
Alister,Claudio; Araya,Manuel; Kogan,Marcelo.
Once pesticides reach the soil, there are several factors that affect their soil behavior. To identify the principal soil and herbicide properties that control their adsorption and leaching, a study of five Chilean agricultural and forest soils was performed. Simazine, diuron, terbuthylazine and MCPA were applied to the top of 45-cm tall by 12-cm diameter disturbed soil columns, filled with either an Andisol, Ultisol, Entisol or one of two Inceptisol soils. After herbicide applications, each lysimeter received 24 mm of simulated rain every 24 hours for five days. Once water percolation stopped, the lysimeters were divided into five sections and herbicide concentrations were quantified using High Pressure Liquid Chromatography. Relationships between soil...
Tipo: Journal article Palavras-chave: Diuron; Fulvic acids; Humic substances; MCPA; Triazines.
Ano: 2011 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202011000200010
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Organic matter fractions and soil fertility under the influence of liming, vermicompost and cattle manure Scientia Agricola
Yagi,Renato; Ferreira,Manoel Evaristo; Cruz,Mara Cristina Pessôa da; Barbosa,José Carlos.
This work evaluates effects of cattle manure vermicompost in association with liming on soil fertility indexes. The experiment was carried out in greenhouse conditions, in pots containing samples of a Typic Hapludox, medium-textured soil. Five levels of vermicompost (equivalent to 0, 28, 42, 56, and 70 t ha-1, dry weight) and five liming levels (to raise base saturation to 20, 30, 40, 50, and 60%) were combined in a factorial scheme and samples were incubated for 180 days. Samples of the same soil received the equivalent to 70 t ha-1 of the cattle manure used to produce the vermicompost, and the same lime rates. Cattle manure was better than vermicompost to supply K and Mg. Small differences in P supply were observed between the manures. The vermicompost...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Manure; PH; Fulvic acids; Humic acids; Humin.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000300021
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Solubility of Heavy Metals/Metalloid on Multi-Metal Contaminated Soil Samples from a Gold Ore Processing Area: Effects of Humic Substances Rev. Bras. Ciênc. Solo
Boechat,Cácio Luiz; Pistóia,Vítor Caçula; Ludtke,Ana Cristina; Gianello,Clesio; Camargo,Flávio Anastácio de Oliveira.
ABSTRACT Bioavailability of heavy metals at contaminated sites is largely controlled by the physicochemical properties of the environmental media such as dissolved organic matter, hydroxides and clay colloids, pH, soil cation exchange capacity and oxidation-reduction potential. The aim of this study was to investigate soil pH and heavy metal solubility effect by levels of humic and fulvic acids applied in soil samples with different levels of contamination by heavy metals. The soil samples used in this study were collected in a known metal-contaminated site. Humic acid (HA) and fulvic acid (FA) were purchased as a commercially available liquid material extracted from Leonardite. The experiment was carried out in a factorial scheme of 4 × (4 + 1), with four...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil pH; Bioavailable metal; Humic acid; Fulvic acids; Metal leaching.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100528
Registros recuperados: 8
Primeira ... 1 ... Última
 

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