humic acid

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humic acid

A heteropolymeric mixture of organic molecules from biodegradable humis, peat and soil.

humic acid

the precipitate resulting from the addition of acid to a solution of HUMUS. Black in colour, it is insoluble in acids and organic solvents.
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Absorbance due to HS (specifically humic acid equivalents (HAeq); Abs HS HAeq) was calculated as shown in Eqn 3.
FIGURE 2: Organic Carbon content on fractions of the humic substances (SH): fulvic acids (AF), humic acids (AH), humin (HUM), and non-humic substances (SNH) on Humic Cambisol from areas under native grassland (CN), five-year old Pinus (P05), sixteen-year old Pinus (P16), and twenty-one-year old Pinus (P21) (Graph A) and proportion of these chemical fractions related to total organic carbon (TOC) (Graph B).
Content of Auxin-, inhibitor- and Gibberellin-like substances in humic acids.
Humic acids isolated from earthworm compost enhance root elongation, lateral root emergence, and plasma membrane H+ATPase activity in maize roots.
Fulvic acid is lower molecular weight macromolecule, soluble at all pH values, mixture of yellow to brown color, These molecules are known to be heterogeneous polyacids with polymeric structure formed by different types of functional groups like aliphatic and aromatic organic acids having many aromatic rings attached to (carboxyl, phenols, quinones and semiquinones) [5,8,9,12] and the number of oxygen containing functional groups is more than humic acid [13].
Gladiolus development in response to bulb treatment with different concentrations of humic acids.
Humus, which includes humin, humic acid (HA) and fulvic acid (FA), is the most important and largest constituent of soil organic matter and is formed by decomposition of plant and animal residues by micro-organisms.
Amino acids and humic acid gives strength to plants against drought, diseases and reduces immature flower/fruit dropping.
Since humic acids present a good solubility in water and this characteristic decreases the adsorption procedures.
Decreases in lettuce dried shoot weight produced with OCP with increases in SCN may be due to the enhanced uptake of B caused by humic acids added to the soil with SCN.