humic acid


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Related to humic acid: fulvic acid

humic acid

[′hyü·mik ′as·əd]
(organic chemistry)
Any of various complex organic acids obtained from humus; insoluble in acids and organic solvents.
References in periodicals archive ?
Caption: New research out of Canada indicates soil with high levels of humic acid could reduce or eliminate the infectious nature of prions responsible for Chronic Wasting Disease.
The findings of the current study, showing lighter breast muscles in broilers fed the Control and CMPh diets are consistent with findings by Wang et al [12] and Adeyemi and Sazili [32] who observed that humic acid inclusion in diets can improve the appearance of the meat.
The soil in the experiment was alkaline and the pH tended to increase with an increase in the humic acid concentration (P<0.05).
Addition of peat and leonardite humic acids does not influence the content of available phosphorus in Latosol when the dose to correct P deficiency corresponds to the recommended one, irrespective of acidity correction (pH 4.5 or 7.0).
Humic substances (HS), the main constituent of organic matter, present heterogeneous mixture of organic compounds aggregated by weak intermolecular interactions of hydrophobic nature and by hydrogen bonds (Matilainen et al., 2011; Valencia et al., 2013), which are fractionated in humic acids (HA), fulvic acids (FA) and humins (Baldotto et al., 2013); HS have a structural complexity due to the presence of organic functional groups that provide several functions in the nutrition of plants and improvement of the physical and chemical properties of the soil.
Gonzalez-Vila, "Selective effects of forest fires on the structural domains of soil humic acids as shown by dipolar dephasing [sup.13]C NMR and graphical-statistical analysis of pyrolysis compounds," Journal of Soils and Sediments, vol.
Among four media, ratio of antagonistic isolates was highest on water agar and lowest on modified humic acid agar (Table 3).
NOM consists of fulvic acid (FA), the component soluble in acidic water, and humic acid (HA), the component insoluble in acidic water.