Humic Acid Regulates Microorganisms—The Key to Fertile Soil and Increased Yields!
Humic acid is a complex macromolecular organic polymer formed through millions of years of microbial decomposition and geological processes acting upon plant and animal remains. Not only is it a core component of soil organic matter, but it also improves soil structure, stimulates crop growth, and enhances fertiliser utilisation efficiency, serving as a vital bridge linking soil health to crop productivity. Humic acid significantly promotes and activates microbial proliferation in the vast majority of soils and water bodies, earning it the titles of ‘microbial activator’ and ‘soil prebiotic’. Max Group meticulously selects premium young brown coal from high-quality mining areas. Combined with Max's proprietary innovative extraction process, this yields highly active, high-purity natural humic acid. This ensures that the Ultra HumiMax, HUMICARE, and FulvoMAX series of humic acid-containing water-soluble fertilisers demonstrate outstanding product efficacy and consistent quality. Purity is guaranteed from the source, and efficiency is achieved through advanced processing.
- Humic Acid: The Core Hub for Regulating Soil Microorganisms
The primary mechanisms and modes by which humic acid influences microbial proliferation are as follows:
- Direct promoting effect
(1) As a ‘slow-release nutrient source’ for microorganisms
Humic acid itself is a complex organic molecule composed of elements such as carbon, hydrogen, oxygen, nitrogen, and sulphur. Although it cannot be rapidly utilised by most microorganisms as a sole carbon source, certain readily degradable components within its structure can be slowly broken down and utilised by specific microorganisms (such as certain actinomycetes and fungi), providing a long-term source of carbon and energy.
(2) As an ‘electronic shuttle’
This represents a highly critical and cutting-edge function of humic acid. The quinone moiety within humic acid molecules can undergo reversible redox reactions, acting as an “electron intermediary” or “electron shuttle”. Certain microorganisms, when respiring under anaerobic conditions (such as reducing iron, manganese, or nitrate), can transfer electrons to humic acid. The humic acid then relays these electrons to more distant, hard-to-reach terminal electron acceptors (such as insoluble iron oxides). This significantly enhances the respiratory efficiency and energy acquisition of these microorganisms, thereby promoting their growth and metabolism.
(3) Enhance cell membrane permeability
The low molecular weight fractions of humic acid (such as fulvic acid) interact with microbial cell membranes, enhancing their permeability. This facilitates the uptake of nutrients into cells whilst also promoting the efflux of metabolic waste products, thereby increasing the metabolic rate and growth velocity of microorganisms.
- Indirect promotion (through improvement of the microenvironment)
(1) Creating favourable physical habitats
Formation of soil aggregates: Humic acid acts as the “binder” in the formation of soil aggregates. It enables soil particles to coalesce, creating a loose, porous aggregate structure. This structure offers excellent aeration and strong water retention, providing an ideal habitat for aerobic and facultative anaerobic microorganisms. It prevents both oxygen-depleted conditions caused by waterlogging and excessively arid environments.
(2) Improving the chemical environment
Buffering pH: Humic acid possesses potent buffering capacity, mitigating drastic shifts in soil acidity or alkalinity to stabilise pH within a range more conducive to most microbial activity (near neutrality);
Chelating and releasing nutrients: Humic acid forms stable, soluble complexes (chelation) with metal ions such as calcium, magnesium, iron, zinc, and manganese;
Prevents fixation: This prevents these metal ions from forming insoluble precipitates and becoming immobilised in alkaline soils;
Promotes uptake: It renders these trace elements available in a form more readily absorbed by microorganisms and plants, effectively providing microorganisms with a ‘pre-prepared meal’.
- Regulatory effects on microbial community structure
The selective promotion effect of humic acid is more conducive to the development of beneficial microbial communities, such as nitrogen-fixing bacteria, phosphorus-solubilising bacteria, potassium-solubilising bacteria, and cellulose-degrading bacteria. This optimises the soil's microbial biota, forming a healthier, more balanced, and functionally diverse microecosystem. For instance, research indicates that humic acid can significantly promote the growth and infection of arbuscular mycorrhizal fungi, thereby aiding plants in better absorbing water and nutrients.
- Ultra HumiMax—A Water-Soluble Fertiliser Containing Humic Acid
Ultra HumiMax selects premium young brown coal from high-quality mining areas, activated through MAXMRT molecular restructuring technology and blended with multiple inorganic nutrients. This formulation exhibits high activity and solubility, significantly improving soil structure, promoting root growth, regulating soil microbial communities, and enhancing crop quality.
Ingredients: Humic Acid (Dry Basis):80%; Water Solubility:99%; Potassium (As K2O):10%; Loss on Drying≤1%; Moisture≤15%.
Functional Features:
- Optimises soil ecology: Enhances the microbial environment, promotes beneficial microbial proliferation, and strengthens crop root absorption capacity and overall growth development;
- Enhances fertiliser efficacy: Facilitates soil aggregate formation, improves fertiliser absorption and utilisation efficiency, thereby boosting crop yield and quality;
- Improves soil conditions: Effectively mitigates saline-alkali damage, optimises soil structure, and promotes healthy crop growth.
Application method: Apply 0.5–1kg of this product per mu. Administer via drip irrigation, foliar spraying, or flushing. Adjust dosage according to plant growth conditions.
Product link:https://www.citymax-group.com/ultra-humimax-product/
- Humic Acid “Regulates” Microbes, Good Soil “Generates” Gold!
Humic acid creates exceptionally favourable conditions for microbial proliferation through multiple direct and indirect pathways, serving as one of the core substances sustaining and activating the vitality of soil and aquatic ecosystems. Measurements indicate that following application of humic acid fertilisers, fibre-degrading bacteria in soil double, ammonifying bacteria that break down amino acids to release ammonia triple, and indigenous nitrogen-fixing bacteria increase more than twofold. The application of humic acid fertilisers rapidly increases the quantity and activity of beneficial soil microorganisms, accelerates organic matter decomposition, releases nutrients, ameliorates soil compaction, and reduces soil-borne diseases. It represents a key strategy for achieving soil fertility enhancement, soil enrichment, and sustainable agricultural practices.
Keywords: humic acid, microorganisms, soil prebiotics, Max Group, water-soluble fertilisers, controlled-release nutrients, electron shuttles, soil aggregate structure, steady state, chelation, microecosystem, biostimulants, green agriculture