Frações da matéria orgânica e propriedades redox de substâncias húmicas em sedimentos de oceanos profundos

Baldotto, Marihus Altoé; Gobo, Arizoli Antonio Rosa; Salomão, Marcos Sarmet Moreira de Barros; Rezende, Carlos Eduardo de; Camargo, Plínio Barbosa de

doi:10.1590/s0100-40422013000900003

Cited by 9 publications

(4 citation statements)

References 20 publications

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“…Most studies focus on TOC, however, small changes in C totals are difficult to detect in the short term because the natural soil variability is high (SILVA et al, 2011). The largest compartment of SOM, waters, and sediments occurs in the form of Humic Substances (HS), a heterogeneous mixture of organic compounds aggregated by weak hydrophobic interactions and by hydrogen bonds (BALDOTTO et al, 2013). The HS is fractionated as a function of its solubility at different pH values: Humic Acids (HA), Fulvic Acids (FA) and Humic (HUM) (ROSSI et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Soil organic matter fractions and carbon management index under integrated crop-livestock system

et al. 2020

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The objective of this work was to evaluate the carbon content of the physical, chemical and oxidizable fractions of soil organic matter (SOM) and to calculate the carbon management index (CMI) in an area managed under an integrated crop-livestock system (ICLS) in the western region of Paraná - Brazil. The experiment was carried out at the experimental farm, belonging to the Universidade Estadual do Oeste do Paraná. Seventeen areas, which are managed in different ways, fifteen in ICLS and two areas of controls (Forest and Haymaking), using the design divided with two nested controls, with three replications were evaluated. Deformed and undisturbed soil samples were collected from all the areas to determine the total organic carbon (TOC), carbon stock, the physical, chemical and oxidizable fractions of SOM and the CMI in the layers of 0-0.05, 0.05-0.1 and 0.1-0.2 m. Little significant changes in the fractions were found for the management of the ICLS area in relation to the Forest and the area of Haymaking, although the Forest presented the best values for most of the studied fractions. It is recommended to adopt sustainable practices, such as ICLS, even though the average fractions tend to take time to match reference areas.

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Section: Introductionmentioning

confidence: 99%

Soil organic matter fractions and carbon management index under integrated crop-livestock system

et al. 2020

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“…Based on their solubility, they are classified as fulvic acids (fraction soluble in alkali and acid) and humic acids (fraction soluble in alkali and insoluble in acid) (BALDOTTO; BALDOTTO, 2014).…”

Section: Introductionmentioning

confidence: 99%

Humic Acid on Germination and Vigor of Corn Seeds1

et al. 2017

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-The development of technologies to increase stand establishment efficiency and seed vigor, as well as to maximize profits, is of fundamental importance for the sustainability of agriculture. Products based on humic substances, such as humic acids, have been recently used in Brazilian agriculture to produce seedlings with high vigor, which positively influences the establishment of the initial stand. Thus, this study aimed to evaluate the effect of treatment of corn seeds with a commercial humic acid-based product, Humykos® (18% of humic acid content), on germination and seedling vigor. The treatments consisted of six doses (0, 100, 200, 300, 400, and 500 mL 100 kg -1 seed) of Humykos®, and the treated seeds were analyzed for germination and vigor (first count, emergence, emergence speed index, length, and dry mass of shoots and roots). Our results show that humic acid promotes greater seedling growth and increased shoot dry mass in corn; in addition, it has a positive influence on the emergence speed index up to a dose 158 mL 100 kg -1 seeds.

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“…O húmus é constituído de substâncias húmicas (SH), que são misturas heterogênicas de compostos orgânicos unidos por interações intermoleculares fracas de caráter hidrofóbico e por ligações de hidrogênio. São fracionadas em ácidos húmicos (AHs), ácidos fúlvicos (AFs) e huminas (HUM) (BALDOTTO et al, 2013). Apresentam alto caráter aromático e variadas porções fenólicas e carboxílicas (MATILAINEN et al, 2011;VALENCIA et al, 2013).…”

Section: Matéria Orgânica + O 2 → Co 2 + H 2 O + Energia (Calor) + Húunclassified

Aplicação Da Compostagem E Da Vermicompostagem Em Solo Contaminado Com Óleo Lubrificante Usado

Primaz¹,

Schweizer²,

Ethur³

et al. 2017

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O óleo lubrificante usado é considerado pela ABNT NBR 10.004:2004 um resíduo perigoso. Quando é destinado inadequadamente pode provocar graves problemas no solo, no ar e na água, pois possui elevados níveis de hidrocarbonetos e de metais em sua composição. Segundo a Resolução CONAMA nº 362/2005, o rerrefino é o destino adequado a este resíduo. A compostagem e a vermicompostagem são alternativas viáveis para o reaproveitamento de solos contaminados com óleo lubrificante. Estes processos aceleram a decomposição da matéria orgânica dos resíduos por meio da ação de micro-organismos e de minhocas, obtendo um material mais estável e com qualidade superior ao da matéria-prima inicial. Perante isso, o objetivo deste trabalho foi utilizar a compostagem e a vermicultura como técnica de recuperação de um solo contaminado com óleo lubrificante usado. Para isso, foram analisados parâmetros tais como pH, nitrogênio total, fósforo, potássio, umidade e Hidrocarboneto Total de Petróleo (HTP), antes e depois do processo, afim de verificar a degradação dos compostos orgânicos do resíduo e o aumento dos nutrientes no solo. Como resultados pode-se verificar que houve aumento nos teores de fósforo, potássio e umidade no composto e no vermicomposto final, melhorando a qualidade do solo, consolidando a concepção de ser usado como fertilizante.

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Frações da matéria orgânica e propriedades redox de substâncias húmicas em sedimentos de oceanos profundos

Cited by 9 publications

References 20 publications

Soil organic matter fractions and carbon management index under integrated crop-livestock system

Soil organic matter fractions and carbon management index under integrated crop-livestock system

Humic Acid on Germination and Vigor of Corn Seeds1

Aplicação Da Compostagem E Da Vermicompostagem Em Solo Contaminado Com Óleo Lubrificante Usado

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