1、Humic acids: Structural properties and multiple functionalities for novel technological developments

Humic acids (HAs) are macromolecules that comprise humic substances (HS), which are organic matter distributed in terrestrial soil, natural water, and sediments resulting from the decay of vegetable and natural residues [1].

2、Humic products in agriculture: potential benefits and research challenges—a review

Finally, humic products are widely presumed to promote root growth, which offers the potential to increase soil C inputs and thereby improve soil health. Yet virtually, no such evidence has been presented, in part due to the absence of long-term field trials.

3、Structure

Knowledge of the structure-property-function relationship of humic substances (HSs) is key for understanding their role in soil. Despite progress, studies on this topic are still under...

4、Humic acids: Their detergent qualities and potential uses in pollution remediation

The strong association between metal ions and solid humic acid makes it possible to use an inexpensive commercial grade for the decontamination of polluted water. A continuous elution process through a column packed with humic acid allows for the removal of both heavy metals and organic xenobiotics from aqueous solution.

Replenishing Humic Acids in Agricultural Soils

Humic acids are brown-black polymeric acids of plant origin that are ubiquitous at the Earth’s surface. The term humus originally meant all organic compounds of plant origin in the soil, and is used as such in this report.

Humic Substances in Soils: Are They Really Chemically Distinct?

We therefore suggest that the vast majority of operationally defined humic material in soils is a very complex mixture of microbial and plant biopolymers and their degradation products but not a distinct chemical category.

Humic acids: Their detergent qualities and potential uses in pollution remediation

Humic acids are amphiphilic species whose behavior in aqueous solution suggests that they form pseudomicelles—aggregates akin to the micelles familiar from synthetic surfactant chemistry.

Molecular Understanding of a Humic Acid by “Humeomic” Fractionation and Benefits from Preliminary HPSEC Separation

A mild stepwise fractionation of molecular components of a humic acid (HA) is here aimed to address the need of a systematic and reproducible method of separation and characterisation of humic substances.

Chemical Properties of Humic and Fulvic Acid Products and Their Ores of Origin

Commercial products consisting of humic and fulvic acids are thought to boost plant growth and economic yield in cropland agriculture. The specific mechanism for their benefit is unknown, in part because little information is available on the chemical nature of these products.

Reduced humic acid nanosheets and its uses as nanofiller

In the present study, reduced humic acid from leonardite has been synthesized in large scale by the catalytic hydrogenation using the high pressure stirred reactor at low temperature (150 °C). Moreover, the feasibility of using reduced humic acid as nanofiller has been investigated.

Humic acid is a critical organic substance found in soil, primarily formed through the decomposition and transformation of plant and animal residues under microbial action. It plays multiple roles and offers significant benefits in agricultural production, environmental protection, and other fields.

1. Soil Structure Improvement

Humic acid increases soil porosity, enhancing air permeability and water penetration. This makes the soil looser, facilitating root growth. Additionally, it adsorbs harmful substances in the soil, reducing their toxic effects on plants.

2. Nutrient Supply

Rich in organic matter, humic acid provides essential nutrients for plants. It also promotes the dissolution and release of minerals in the soil, thereby improving soil fertility.

3. Plant Growth Promotion

Humic acid strengthens plants’ stress resistance and enhances their ability to fend off pests and diseases. It also regulates hormonal balance within plants, supporting healthy growth and development.

4. Soil Fertility Enhancement

By increasing nutrient content, humic acid boosts soil fertility. It forms complexes with minerals, preventing their loss during weathering. it stimulates microbial activity, accelerating organic matter decomposition and further enriching soil nutrients.

5. Environmental Protection

Humic acid improves soil conditions, reduces the need for chemical fertilizers, and lowers agricultural pollution. It also enhances soil self-purification, minimizing the accumulation of pollutants like pesticides.

6. Crop Yield Increase

Through improved soil fertility, stronger plant growth, and better crop quality, humic acid significantly raises agricultural output. Studies show crops treated with humic acid yield over 20% more than untreated ones.

7. Resource Conservation

As a natural organic fertilizer, humic acid can replace part of chemical fertilizers, reducing production costs. By enhancing soil fertility, it also cuts fertilizer usage, conserving water and energy resources.

8. Sustainable Agriculture Support

As a green fertilizer, humic acid fosters sustainable agriculture. Proper use protects soil resources, minimizes environmental damage, and promotes harmonious coexistence between farming and nature.

Humic acid plays a vital role in agriculture and environmental protection. Rational application not only boosts crop yields and quality but also preserves soil health and advances sustainable farming. To maximize these benefits, we should prioritize the use of humic acid, contributing to both agricultural productivity and ecological conservation.