Biological Activity of Humic Substances Is Related to Their Chemical Structure

Muscolo, Adele; Sidari, Maria; Attinà, Emilio; Francioso, Ornella; Tugnoli, Vitaliano; Nardi, Serenella

doi:10.2136/sssaj2006.0055

Cited by 97 publications

(79 citation statements)

References 76 publications

(74 reference statements)

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“…An inhibitive effect on seed germination was connected above all with HA isolated from O h -horizon of podzol from the mountain spruce stand (E) in the initial days. This negative activity is in accordance with testing of HS isolated from forest soil (Halley & Pellisier 1997;Nardi et al 2002;Muscolo et al 2007). HS activity may be related to their physical and chemical properties.…”

Section: Discussionsupporting

confidence: 87%

“…HS activity may be related to their physical and chemical properties. High contents of betaine, organic acid, and -COOH groups were determined in forest humic fractions (Muscolo et al 2007). Phenolic compounds contained in coniferous forest soils (podzolic horizon) are responsible for allelopathic effect on spruce seedlings (Pellisier 1993;Halley & Pellisier 1997).…”

Section: Discussionmentioning

confidence: 99%

“…Positive effect of HS on growth and yield of main crops has been widely confirmed (Sanders & Prince 1988;Reynolds et al 1995;Sharif et al 2002;Olk et al 2007). The mechanism by which HA and FA stimulate plants is difficult to clarify due to the chemical heterogeneity of HS (Christl et al 2000;Veselá et al 2005;Muscolo et al 2007) and uncertainty about their characterization (Gonzales-Perez et al 2006). Different biological activities of prepared HS are influenced mainly by soil type or their origin (Lulakis & Petsas 1995;Asenjo et al 2000;Muscolo et al 2002;Nardi et al 2002;von Lutzow et al 2006).…”

Section: Introductionmentioning

confidence: 99%

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The effect of humic substances on germination and early growth of Lamb’s Quarters (Chenopodium album agg.)

Šerá¹,

Novák²

2011

Biologia

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In order to understand the biological activity of humic substances (HS), the effect of four humic acids (HA) and one fulvic acid (FA) on seed germination and early growth of cosmopolitan weed Chenopodium album agg. were tested. Humic substances of diverse origin were used, namely purified commercial HA, HA isolated from lignite, cambisol and podzol, and FA from mountain spruce forest soil. Data processing by two-way ANOVA has shown that type of the tested substances was a more important factor on seed development than used concentration. The major differences in germination and length of shoots were found in the first days of the experiment. Commercial and lignite HA stimulated the seed germination and growth, while podzol HA inhibited them. After this initial phase, all humic substances stimulated the seed development, but these stimulations were not significant (P < 0.05). At the end of germination test, the greatest stimulation effect (up to 20%) was achieved with the lignite HA.

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“…The inhibitory effect of humic acid is caused when the applied dose is high, which is detrimental for the germination of some species. Another factor that is not favorable for germination is the source of humic acid used; as some sources of humic acid from the decomposition of conifers are responsible for allelopathic effects on germination of some species (MUSCOLO et al, 2007). Humic acid specifically influences the germination of different plant species depending on its source and dose, making it a subject of further research to better understand the mode of action to develop specific protocols for each culture.…”

Section: Resultsmentioning

confidence: 99%

“…The activity mechanism of humic acid in promoting plant growth is not fully understood, and the beneficial effects to plants is difficult to comprehend due to its chemical heterogeneity (VESELÁ et al, 2005;MUSCOLO et al, 2007).…”

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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Biological Activity of Humic Substances Is Related to Their Chemical Structure

Cited by 97 publications

References 76 publications

The effect of humic substances on germination and early growth of Lamb’s Quarters (Chenopodium album agg.)

Humic Acid on Germination and Vigor of Corn Seeds1

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