Humic substance: Relationship between structure and activity. Deeper information suggests univocal findings

Muscolo, Adele; Sidari, Maria; Nardi, Serenella

doi:10.1016/j.gexplo.2012.10.012

Cited by 136 publications

(120 citation statements)

References 56 publications

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“…Average growth and yield properties, as a function of cycle and total dose applied is no consensus regarding the mechanisms of action of these organic acids, given the varied responses of plants with concentration, molecular weight, organic acid structure and sources of humic substances, in addition to variations by plant species (Lodhi et al 2013, Muscolo et al 2013, Zandonadi et al 2013, Caron et al 2015.…”

Section: Resultsmentioning

confidence: 99%

Agronomic performance and soil chemical attributes in a banana tree orchard fertigated with humic substances1

Melo

Coelho

Borges

et al. 2016

Pesqui. Agropecu. Trop.

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Fertigation with humic substances products has been adopted in commercial banana tree plantations. However, there are few studies on the procedure to confirm its technical feasibility. This study aimed at assessing the effects of fertigation with humic substances on the chemical attributes of a Dystric Densic Xantic Ferralsol cultivated with the 'BRS Princesa' banana tree cultivar and on the agronomic performance of the orchard. The experiment was conducted using a randomized blocks design, with six treatments and four replications. Treatments consisted of a monthly application of humic substances doses based on the commercially recommended reference dose for the banana plantation (12.09 kg ha-1 cycle-1). The doses used were equivalent to percentages of the reference dose (100 %, 150 %, 200 %, 250 % and 300 %), in addition to the control. No significant effects of the fertigation with humic substances that could justify the use of the product at the doses assessed were observed on the soil chemical attributes, banana growth and yield.

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Section: Resultsmentioning

confidence: 99%

Agronomic performance and soil chemical attributes in a banana tree orchard fertigated with humic substances1

Melo

Coelho

Borges

et al. 2016

Pesqui. Agropecu. Trop.

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“…Nevertheless, a number of mechanisms have been suggested including 'hormone-like' 77 effects (Chen et al, 2004a, Muscolo et al, 1998, Muscolo et al, 2012this however, 78 is the subject of ongoing debate, and there is a need for further detailed studies of a 79 range of HS on more plant species and soil types (Rose et al, 2014). leonardite are commonly marketed either in 'raw', 'run-of-mine' state or in the form 85 of humic acid (HA) that has been extracted under alkaline conditions (Demirbas et al,86 measures of soil health in pasture soil.…”

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confidence: 99%

Do lignite-derived organic amendments improve early-stage pasture growth and key soil biological and physicochemical properties?

et al. 2014

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“…The properties and structure of HS may vary substantially, depending on the characteristics of the water or soil, of the compounds of origin, maturation of the HS and specific conditions of extraction (Fong and Mohamed, 2007;Muscolo et al, 2013;Garcia et al, 2016). Aquatic humic substances (AHS) can be formed directly in the aquatic environment, or from HS present in soils and sediments and transported to the waters by processes of lixiviation and surface runoff (Yang et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

“…In general, both AHS and humic substances from peat (HSP) can be considered biogenic organic substances, poly-electrolyte with properties that are similar to bio-colloids, such as dark coloration, heterogeneous nature, high molecular weight, many different molecular sizes (poly-dispersity), refractory, partially biodegradable and with a complex structure (McDonald et al, 2004;Muscolo et al, 2013;Wagner et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…The HS have been evaluated in different studies, such as in agriculture, transport of contaminants in the environment, metal complexation and drinking water treatment (Araújo et al, 2002;Samios et al, 2007;Campos et al, 2007;Rigobello et al, 2011;Sachs and Bernhard, 2011;Muscolo et al, 2013). When using chlorine, HS lead to a high demand of the disinfectant, as well as the formation of toxic halogenated byproducts as trihalomethanes (Pascoalatto et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

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Comparative characterization of humic substances extracted from freshwater and peat of different apparent molecular sizes

Rigobello¹,

Campos²,

Azevêdo³

et al. 2017

Rev. ambiente água

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This paper compares the structural characteristics of aquatic humic substances (AHS) with humic substances from peat (HSP) through different analytical techniques, including elemental analysis, solid state 13 C cross polarization/magic-angle-spinning nuclear magnetic resonance spectroscopy ( 13 C CP-MAS NMR), ultraviolet/visible (UV/Vis) spectroscopy and Fourier transform infrared (FTIR) spectroscopy and total organic carbon (TOC). The AHS were extracted from water collected in a tributary of the Itapanhaú River (Bertioga/SP) using XAD 8 resin, and the HSP were extracted from peat collected in the Mogi Guaçu River bank (Luis Antonio/SP) with a KOH solution. After dialysis, both AHS and HSP extracts were filtered in membrane of 0.45 µm pore size (Fraction F1: < 0.45 µm) and fractioned by ultrafiltration in different apparent molecular sizes (AMS) (F2: 100 kDa-0.45 μm; F3: 30 kDa-100 kDa and F4: < 30 kDa). The extracts with the lowest AMS (F3 and F4) showed a higher number of aliphatic carbons than aromatic carbons, a higher concentration of groups containing oxygen and a higher percentage of fulvic acids (FA) than humic acids (HA) for both AHS and HSP. However, the AHS presented higher FA than HA content in relation to the HSP and distinct structural properties.Keywords: fulvic acid, humic acid, humic substances, ultrafiltration. 775Comparative characterization of humic substances … Rev. Ambient. Água vol. 12 n. 5 Taubaté -Sep. / Oct. 2017 Caracterização comparativa de substâncias húmicas extraídas de água e de turfa de diferentes tamanhos moleculares aparentes RESUMOEste artigo compara as características estruturais das substâncias húmicas aquáticas (SHA) com substâncias húmicas de turfa (SHT) usando diferentes técnicas analíticas, incluindo análise elementar, espectro de polarização cruzada de estado sólido 13 C/ espectroscopia de ressonância magnética nuclear ( 13 C CP-MAS RMN), espectroscopia no ultravioleta/visível e infravermelho com transformada de Fourier e carbono orgânico total (COT). As SHA foram extraídas de água coletada em um afluente do rio Itapanhaú (Bertioga/SP), utilizando resina XAD 8 e as SHT foram extraídas de turfa coletadas na margem do rio Mogi-Guaçu (Luis Antonio/SP) com uma solução de KOH. Após a diálise, ambos extratos de SHA e SHT foram filtrados em membrana com 0,45 m de tamanho de poro (Fração F1: < 0,45 m) e após fracionados através de ultrafiltração em diferentes tamanhos moleculares aparentes (F2: 100 kDa-0,45 m; F3: 30 -100 kDa e F4: < 30 kDa). Os extratos de menor tamanho (F3 e F4) apresentaram um maior número de átomos de carbono alifáticos do que de carbonos aromáticos, uma maior concentração de grupos contendo oxigênio e uma percentagem mais elevada de ácidos fúlvicos do que os ácidos húmicos para ambas as frações de SHA e de SHT. No entanto, as SHA apresentaram maior quantidade de ácidos fúlvicos que ácidos húmicos em relação às SHT e propriedades estruturais distintas.Palavras-chave: ácidos fúlvicos, ácidos húmicos, substâncias húmicas, ultrafiltração.

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Humic substance: Relationship between structure and activity. Deeper information suggests univocal findings

Cited by 136 publications

References 56 publications

Agronomic performance and soil chemical attributes in a banana tree orchard fertigated with humic substances1

Agronomic performance and soil chemical attributes in a banana tree orchard fertigated with humic substances1

Do lignite-derived organic amendments improve early-stage pasture growth and key soil biological and physicochemical properties?

Comparative characterization of humic substances extracted from freshwater and peat of different apparent molecular sizes

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