What is humic acid used for?

Humic acid is mainly used in three major fields: agricultural fertilizers, industrial production, and environmental protection and medicine. In agriculture, it improves soil, enhances fertilizer efficiency, and promotes crop growth, making it a commonly used “soil conditioner” and “fertilizer synergist” by growers.

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Applications of Humic Acid:

I. Humic acid is most widely used in agriculture, where it is known as a “companion” to chemical fertilizers and a “soil conditioner.” Its core functions can be summarized as follows:

1. Improving Soil Structure: It acts like glue, binding soil particles together to form a granular structure, softening compacted soil, increasing aeration and water retention capacity, and alleviating saline-alkali soil conditions.

2. Improving Fertilizer Utilization:

– Nitrogen Retention: It adsorbs ammonium ions, reducing nitrogen fertilizer volatilization and loss, increasing utilization rate by 30%~40%.

– Phosphorus Solubilization: Activates phosphorus fixed in the soil, reducing phosphorus loss by approximately 45% and making it easier for crops to absorb.

– Potassium Protection: Prevents potassium ions from being lost with water, promotes the release of insoluble potassium, and reduces the loss rate by 30%.

– Micronutrient Chelation: Transforms poorly absorbed elements such as iron, zinc, and calcium into “complexes” that crops can absorb, preventing nutrient deficiency and yellowing leaf disease.

3. Stimulates Crop Growth: Contains active groups similar to plant growth hormones, promoting root development, increasing seed germination rate, and enhancing crop resistance to drought, cold, and lodging.

4. Improves Agricultural Product Quality: Helps fruits become sweeter and more evenly colored, improving taste and commercial value, and can also alleviate premature crop aging.

II. Besides agriculture, humic acid also has many uses in industry and environmental protection:

1. Industrial Production:

– Ceramics and Building Materials: Used as a ceramic slurry conditioner to improve fluidity; used as a water-reducing agent in cement.

– Petroleum and Boilers: Treats drilling mud, reducing water loss; used for boiler scale prevention, improving thermal efficiency.

– Batteries: Purified humic acid can be used as a cathode expander in lead-acid batteries.

2. Environmental Governance:

– Wastewater Treatment: Adsorbs heavy metal ions, treats wastewater containing heavy metals, and purifies aquaculture water environments.

– Sand Control: Used in ecological agriculture construction to help stabilize sand and soil.

3. Medicine and Animal Husbandry:

– Medicine: Sodium humate has anti-inflammatory, hemostatic, and wound-healing effects, but dosage must be strictly controlled.

– Animal Husbandry: Adding it to feed can improve animal growth rate and promote feed absorption.

Usage Considerations and Risks

Precautions for Humic Acid Use:

Although humic acid has many benefits, safety and proper usage methods must be observed to avoid adverse effects:

1. Concentration Control: The concentration for foliar spraying is generally 0.05%~0.1%. Excessive concentration can inhibit crop growth and even burn roots and leaves.

2. Contraindications for Mixing: Humic acid is acidic and should not be mixed with alkaline pesticides (such as Bordeaux mixture and lime sulfur) or alkaline fertilizers (such as quicklime), otherwise it will reduce fertilizer effectiveness or cause phytotoxicity.

3. Health Risks:

– Drinking Water: Excessive humic acid content in water sources may be associated with Kashin-Beck disease, and carcinogenic byproducts may be generated during the chlorination disinfection process of tap water. Attention should be paid to drinking water safety.

– Toxicity: Sodium humate has a certain degree of toxicity. Medical use should be under the guidance of a doctor and should not be taken arbitrarily.