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Humic acid plays a critical role during fruit coloration. It adopts a synergistic five-in-one mechanism: pigment formation, sugar transport, potassium activation, carbon-nitrogen regulation and root system maintenance. This precisely regulates fruit physiological activities at the key color development stage, delivering noticeable improvements including uniform coloring, higher sugar content, better fruit firmness and stronger storability.

Fruit coloration is one of the most critical stages determining fruit quality. Field applications of humic acid products show that pre-coloring application significantly promotes color development. The mechanisms are as follows:

1. Promotes anthocyanin synthesis

Low-molecular-weight humic acid can be absorbed by crops and act as an internal metabolic regulator. It upregulates genes related to anthocyanin/flavonoid biosynthesis and enhances enzyme activity, accelerating pigment precursor formation and laying a strong foundation for fruit coloration.

2. Accelerates sugar transport

By improving leaf photosynthetic efficiency and increasing chlorophyll content, humic acid promotes the production of more photosynthates (sugars). It also regulates metabolic activity, accelerating sugar transport from leaves to fruits, providing essential nutritional support for coloration.

3. Enhances potassium uptake and utilization

Humic acid features the functions of nitrogen control, phosphorus activation and potassium mobilization. During the coloration stage, it boosts potassium absorption and utilization, prevents potassium and trace elements from being fixed and lost, and facilitates anthocyanin synthesis and sugar translocation.

4. Regulates carbon/nitrogen ratio and hormone balance

As an organic carbon source, humic acid improves the carbon-to-nitrogen ratio in plants while reducing excessive nitrogen effects. It helps inhibit excessive gibberellin and auxin activity, prevents excessive vegetative growth, and works synergistically with ethylene to promote anthocyanin formation and fruit coloration.

5. Maintains a strong root system

Humic acid effectively boosts root growth and vitality. During the coloration stage, it sustains continuous supply of water and mineral nutrients, delays leaf senescence, prolongs the functional period of leaves, and delivers more photosynthates to fruits.

Conclusion

In summary, humic acid regulates fruit development during the key color turning window through a five-in-one mechanism: pigment formation, sugar transport, potassium activation, carbon/nitrogen regulation, and root system maintenance. This results in more uniform coloration, higher sugar content, improved firmness, and better storability.

ULTRA HUMIMAX from CityMax Group is a high-grade mineral potassium humate fertilizer made from weathered lignite. Featuring a low-molecular-weight structure and abundant active carboxyl groups, it has powerful chelating ability to activate soil nutrients and raise nutrient uptake efficiency. It effectively optimizes soil aggregate structure, increases soil organic matter, improves water and fertilizer retention, and fosters robust root and crop growth. Rich in mineral humic acid, the product strengthens crop stress tolerance and improves fruit quality. It is applicable for drip irrigation, fertigation and fertilizer formulation, and supplied in tablet and powder forms to suit diverse usage scenarios. For application at the early stage of fruit coloration, use 3–5 kg per hectare via fertigation or drip irrigation.

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Company Name: Citymax group
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Country: China
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