Ten major functions of humic acid

Ten major functions of humic acid

Summary

Humic acid is a natural organic macromolecule widely found in soil. As the core of organic matter, it enhances soil structure, boosts water retention, and improves nutrient use, serving as an excellent soil conditioner.

Ten major functions of humic acid
Ten major functions of humic acid
What is humic acid
Humic acid is a natural mixture of organic macromolecular compounds. It is widely present in nature, with the largest proportion found in soil. Soil humic acid is a physicochemical heterogeneous complex mixture with polydisperse molecular weight. This mixture consists of natural, high molecular weight, yellow to black, amorphous, colloidal, aliphatic, and aromatic organic polyelectrolytes, and cannot be represented by a single chemical structural formula.
humic acid
2. Where does humic acid come from
1) Soil humic acid is innate, primarily consisting of a mixture of special macromolecular organic compounds formed by plants under the action of microorganisms.
2) Coal humic acid is a mixture of macromolecular organic compounds formed through microbial decomposition and transformation of plants, followed by long-term geochemical processes.
3. Structure, Function, and Role of Humic Acid
1) Structure: Humic acid is a class of natural organic weak acids, consisting of three parts: fulvic acid, humic acid, and brown humic acid.
2) Elemental composition: Coal humic acid shares similar structure and properties with humic acid found in soil organic matter. The main elements of humic acid are carbon, hydrogen, and oxygen, along with minor amounts of nitrogen and sulfur. Additionally, it contains various functional groups.
3) The role of humic acid: Generally, more than half of the organic matter in soil is humic acid, which is the main component of soil organic matter and combines with metal ions to form salts. Humic acid is the most active and effective part of organic matter.

Humic acid is an organic colloidal substance with water absorption and retention functions. It has a large cation exchange capacity, strong adsorption buffering capacity, and chelating ability, which can improve nutrient utilization efficiency in soil and buffer acid-base damage. Humic acid is an organic macromolecular colloid with strong water absorption and retention functions. The water absorption rate of clay particles is generally 50%-60%, while the water absorption rate of humic acid substances can reach 500%-600%. Therefore, using humic acid fertilizers is beneficial to improving soil moisture conditions.
micronutrient fertilizers
humic acid

Humic acid can improve soil structure
The fertility of soil is determined by organic-inorganic complexes. Inorganic mineral colloids generally account for more than 95% of the soil content, exerting a certain influence on the basic fertility of soil and being unalterable through artificial means. Organic colloids, namely humic acid substances, generally account for only about 5% of the organic-inorganic complexes
yet they play an equally important role as mineral colloids and can be regulated through artificial measures. The application of organic fertilizers, humic acid soil conditioners, and soil improvement fertilizers increases the content of humic acid in the soil, which acts as a binder in the formation of soil aggregate structure, enhancing the degree of organic-inorganic complexity in the soil and increasing the number of large-sized water-stable aggregates, thereby improving soil structure. Therefore, the application of humic acid fertilizers can effectively improve the physical structure of various soils. Hence, humic acid is known as a high-quality soil conditioner.
Richase offers a complete range of soil improvement products, from high-purity Magnesium Oxide for pH correction to various micronutrient fertilizers. Our technical experts can help design customized soil amendment solutions based on soil analysis, helping farmers achieve sustainable productivity improvements and better economic returns.
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