humic acid

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a dark brown humic substance that is soluble in water only at pH values greater than 2

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1951) using bovine serum albumin (BSA; Sigma, St Louis, MO, USA) and commercial humic acid (Sigma) as calibration standards.
FIGURE 1: Distribution of organic carbon content (g kg-1) in the humic substances, fulvic acids (AF), humic acids (AH), and humin (HUM), on native grassland (CN), five-year old Pinus (P05), sixteen-year old Pinus (P16), and twenty-one-year old Pinus (P21) areas, in five layers until depth of 40 cm in a Humic Dystrupept.
The humic substances (fulvic acid, humic acid and humin) were fractionated according to the methodology described by Mendonca & Matos (2005) and their C contents were quantified through oxidation of potassium dichromate.
Based on active ingredients, the global biostimulants market has been segmented into Humic, Fulvic, Seawood Extracts, Amino Acid, Vitamins, and Others.
According to Sarir and Durrani (2006), application of humic acid could enhance availability of plant nutrients and concomitant increase in yield and yield components of maize and could also make the soil environment more conducive for enzymatic activities which antagonize root diseases.
Humic substances alter plant development (Nardi, Pizzeghello, Muscolo, & Vianello, 2002; Canellas, Olivares, Okorokova-facanha, & Facanha, 2002; Chen, Clapp, & Magen, 2004) directly affect plant metabolism through their effects on the soil, such as metal complexation, increased cation exchange capacity, nutrient supply and water retention; and influence ion transport, respiratory activity, chlorophyll content, nucleic acid synthesis and the activity of various enzymes (Nannipieri, Muccini, & Ciardi, 1983).
Next, in the course of a geological and pedological survey, a report was found in a soil database [3] which stated that Russian soil belongs to an organic soil area, and that its organic soil components are mainly composed of bulky organic and humic organic matter, humic substances being especially reactive with metals [4].
Fulvic acid was isolated from the agriculture soil of District Naushahro Feroz, Sindh, Pakistan by International Humic Substances Society (IHSS) method.
ABSTRACT: Humic acid is an organic acid having positive effect on plant growth.
The organic compounds of humic substances result from decomposition of dead plants and animals and contain acidic functional groups, besides being important regulators of biogeochemical processes, such as global nutrients and carbon cycle (WOOD et al.
Humic Substances (HS) are a major part of natural organic pollutants that are created through the microbial degradation of herbal and animal tissues.
Amino acids and humic acid gives strength to plants against drought, diseases and reduces immature flower/fruit dropping.
Summary: This study investigated the adsorption of Pb(II) in aqueous solution onto humic acid (HA) surface.
The organic compounds of compost, such as humic compounds, can react to A1 and forming organo-A1 complex, so that it will reduce A1 level in the soil [1,3,7,16,19,15,20].