How Does Humic Acid Influence Endogenous Hormone Balance in Crops?

In many cases, faster crop growth does not simply result from applying more fertilizer. From root development and shoot growth to flowering and fruit expansion, plants continuously rely on endogenous hormones to regulate the growth and development of different organs. When soil conditions deteriorate, root activity declines, or nutrient supply becomes imbalanced, the plant’s endogenous hormone balance may also be affected, resulting in weak roots, uneven growth, and reduced stress tolerance.

As a natural organic active substance, humic acid is not a plant hormone in the traditional sense. However, by improving the rhizosphere environment, promoting nutrient uptake, and influencing plant physiological metabolism, humic acid can positively affect endogenous hormone balance and the plant growth regulation system.

1. How Does Humic Acid Participate in Plant Growth Regulation?

Research and field practice have shown that once humic acid enters the rhizosphere, it can improve soil aggregate structure, aeration, and water and nutrient retention, creating a more favorable environment for root growth. At the same time, its abundant active functional groups can promote nutrient activation and transport, improving root uptake and utilization of nitrogen, phosphorus, potassium, and micronutrients. Healthy and active roots are themselves an essential foundation for plant growth regulation.

By improving the rhizosphere environment and promoting root development, humic acid can further influence physiological processes associated with endogenous hormones such as auxins, cytokinins, and abscisic acid, helping coordinate root and shoot growth and maintain a better balance between vegetative and reproductive growth.

Therefore, compared with simply supplying a specific nutrient, humic acid can be regarded as helping plants establish a better foundation for their growth environment and physiological regulation.

2. Ultra HumiMax: Supporting Crop Growth Regulation from Soil to Roots

Ultra HumiMax is derived from weathered Leonardite and extracted through CityMax’s proprietary MAXMRT molecular restructuring technology. With a high humic acid content, its low-molecular-weight structure and abundant active functional groups, including carboxyl and quinone groups, provide excellent nutrient complexing and carrier capabilities.

When applied to the soil, Ultra HumiMax can deliver benefits through multiple pathways:

● Soil Improvement: Promotes the formation of soil aggregates, improves compaction and aeration, and creates a favorable environment for root development.

● Nutrient Activation: Promotes the release and utilization of potassium, calcium, magnesium, and micronutrients in the soil, improving nutrient availability in the rhizosphere.

● Root Promotion: Improves the rhizosphere environment, promotes root development and activity, and provides a stronger foundation for healthy crop growth.

● Stress Tolerance: Improves the soil’s ability to retain water and nutrients, helping crops maintain more stable growth under adverse conditions such as drought, high temperature, and salinity.

From this perspective, Ultra HumiMax is not simply a source of humic acid. Instead, it works through a continuous pathway of soil improvement → enhanced root activity → improved nutrient uptake → optimized plant physiological regulation, providing sustained support for healthy crop growth.

3. Application Recommendations

Drip Irrigation: For vegetables, flowers, fruit trees, and other crops during the seedling and vegetative growth stages, apply 8–15 kg/ha per application, for a total of 2–3 applications throughout the growing season. Recommended dilution: approximately 1:1000.

Product Link: https://www.citymax-group.com/ultrahumimax-product/