[Humic Acid Special] A Brief Analysis of the Structure, Functions, and Effects of Humic Acid
Release Date:
2018-03-13
1. Structural humic acids are a class of natural organic weak acids, composed of three fractions: fulvic acid, humic acid, and brown humic acid. 2. Elemental composition: Coal-derived humic acids share similar structures and properties with humic acids found in soil organic matter. The primary elements of humic acids are carbon, hydrogen, and oxygen, with minor amounts of nitrogen and sulfur; they also contain various functional groups. 3. Functions of humic acids: Humic acids constitute the most active and effective fraction of organic matter. (1) Direct effects: They promote plant growth and increase crop yields. (2) Indirect effects: ① Physical effects: A) Improve soil structure; B) Prevent soil cracking and erosion; C) Enhance soil water-holding capacity,
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