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Updated: Jun 12, 2026

Quantification of Humic and Fulvic Acids in Humate Ores, DOC, Humified Materials and Humic Substance-Containing Commercial Products
Published on: March 18, 2022
Humic substances biological activity at the plant-soil interface: from environmental aspects to molecular factors
Sara Trevisan1, Ornella Francioso, Silvia Quaggiotti
1Department of Agricultural Biotechnology; University of Padua, Agripolis, Legnaro, Padova, Italy.
Abstract:
Humic substances (HS) represent the organic material mainly widespread in nature. HS have positive effects on plant physiology by improving soil structure and fertility and by influencing nutrient uptake and root architecture. The biochemical and molecular mechanisms underlying these events are only partially known. HS have been shown to contain auxin and an "auxin-like" activity of humic substances has been proposed, but support to this hypothesis is fragmentary. In this review article, we are giving an overview of available data concerning molecular structures and biological activities of humic substances, with special emphasis on their hormone-like activities.
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