- Potassium Humic Fulvic Round Granule
- Product Overview
- Key Benefits
- Technical Specification
- Form & Solubility
- How the granular grade differs from the soluble grades
- Applications & Dosage
- Packaging & Storage
- Successful Cases
- Frequently Asked Questions
- Also Available in This Family
- Need a quotation or a sample?
Potassium Humic Fulvic Round Granule
The Granular Humic Base for Bulk-Blended Fertilizers
4–6 mm round granule · 25% humic acid · 10% fulvic acid · 70% water soluble · dry-blend base
Product Overview
Potassium Humic Fulvic Round Granule is produced by disc granulation of potassium humate into uniform 4–6 mm spherical granules. It is designed as a bulk-blending base material — not a standalone soluble product — delivering humic and fulvic acids in a form that mixes cleanly with granular NPK, urea, and MAP without segregation.
Potassium Humic Fulvic Round Granule is not a soluble fertilizer ingredient — it is a granular carrier and functional additive for bulk-blended fertilizers. Produced by disc granulation into uniform 4–6 mm spherical granules, it is designed to be mixed physically into NPK, organic, or BB (bulk-blend) fertilizers as a humic-enriched base granule that releases its active fraction gradually in soil moisture.
The numbers are different from our fulvate lines, and they should be: 25% humic acid, 10% fulvic acid, 2–5% K₂O, and 70% water solubility. This is not a product you dissolve in a tank — it is a product you blend into a bag alongside MAP, DAP, urea, and other granular components, where it contributes humic substances to the rhizosphere over time as the granule breaks down in soil.
The round shape and 4–6 mm size band are deliberate: they match the physical profile of standard granular NPK fertilizers, which means the humic granules don’t segregate during transport, bagging, or mechanical spreading. Your blend stays homogeneous from the blender to the field.
Key Benefits
Size-matched to granular NPK
4–6 mm round granules sit in the same size band as standard MAP, DAP, and urea prills. No segregation in the blend, no separation in the spreader.
Disc-granulated for strength
The disc granulation process produces dense, round granules with good crush resistance. They survive drum blending, conveyor transfer, and bagging without breaking into fines.
Gradual release in soil
70% solubility means the active fraction releases over days to weeks in soil moisture, providing extended humic/fulvic activity rather than a single flush. Good for season-long soil conditioning.
Adds humic substances to any granular fertilizer
Turn a standard NPK into a ‘humic-enhanced’ NPK simply by blending in this granule at 3–10%. No reformulation of your base fertilizer needed.
Technical Specification
| Parameter | Specification | Test standard |
|---|---|---|
| Appearance | Black round granule, 4–6 mm | Visual |
| Fulvic acid (dry basis) | 10.0% min | HG/T 5334-2018 |
| Humic acid (dry basis) | 25.0% min | HG/T 3278-2011 |
| Potassium as K₂O (dry basis) | 2.0 – 5.0% | GB/T 33804-2017 |
| pH (1:100) | 9.0 – 10.0 | GB/T 33804-2017 |
| Water solubility (dry basis) | 70.0% min | HG/T 3278-2018 |
Specification values are guaranteed minimums on a dry basis, taken from the batch Certificate of Analysis and tested against the stated Chinese industry standards. Every shipment travels with its own COA stating the tested values.
Need the full Certificate of Analysis, MSDS, or TDS for your formulation or tender file?
Request COA / MSDS / TDSSpecification values are guaranteed minimums on a dry basis, taken from the batch Certificate of Analysis. Every shipment travels with its own COA stating the tested values.
Form & Solubility
Form: hard, dense black round granules, 4–6 mm, produced by disc granulation. Spherical shape, matte-to-slightly-glossy surface.
In water: partially soluble (~70%). Do not use this product in liquid fertilizer tanks or fertigation systems — it is not designed for dissolution. The 70% solubility refers to the fraction that releases in soil moisture over time, not to tank-side dissolution.
In the blender: this is where it belongs. The round 4–6 mm granules mix cleanly with other granular components. They do not produce dust, they do not segregate, and they survive mechanical handling.
In the field: the granule slowly releases its humic and fulvic content into the soil solution as it weathers. This is a slow-release mechanism, not an instant-dissolve one.
How the granular grade differs from the soluble grades
| Grade | Form | Fulvic acid | Humic acid | K₂O | Best for |
|---|---|---|---|---|---|
| Flakes II | 2–3 mm flake | 30% min | 55% min | 10% min | Compound NPK, liquid fertilizer, water-run |
| Powder II | 60–80 mesh powder | 30% min | 55% min | 10% min | Powder blending, WS fertilizer base |
| Sodium-Free Flakes II | 2–3 mm flake | 30% min | 55% min | 15% min | Closed hydroponics, saline & sodic soil |
| Round Granule (this product) | 4–6 mm round granule | 10% min | 25% min | 2–5% | Bulk-blended NPK, organic fertilizer base |
Type I grades (Powder I, Flakes I, Micro Granule I, Extruded Granules I, Sodium-Free Flakes I) run 50–55% fulvic acid with 50% humic acid — see the Type I range if fulvic acid content is your buying criterion.
Applications & Dosage
This product has a specific job — granular blending. It is not for liquid applications:
| Application | How to use | Rate |
|---|---|---|
| BB (bulk blend) fertilizer | Blend at 3–10% with granular NPK (urea, MAP, DAP, MOP). The round granules stay mixed and add humic content to the final blend. | 3–10% of blend |
| Organic fertilizer / granular amendment base | Use as the humic-bearing component in a granular organic fertilizer. Blend with composted manure, amino acid granules, or bio-fertilizer granules. | 10–30% of formulation |
| NPK coating / enhancer | Apply as a functional coating or co-granulate with NPK raw materials to produce ‘humic-enhanced NPK’ in one step. | per process design |
| Soil-conditioning granule for direct application | Broadcast alone or with NPK in soil improvement programmes where granular form is preferred for equipment compatibility. | 20–50 kg/ha |
Packaging & Storage
| Pack size | Description |
|---|---|
| 10 kg | Printed bag — retail and trial size |
| 20 kg / 25 kg | Woven or paper bag with inner PE liner |
| 20 bags per pallet | Shrink-wrapped pallet, ready for container loading |
| 1000–1100 kg | Jumbo bag with discharge spout |
Storage: Store in a cool, dry, well-ventilated place. The granular form is the most storage-stable of all our products — low surface area, dense structure, minimal hygroscopy. Shelf life: 2+ years in original packaging. Will not cake or degrade under normal warehouse conditions.
Custom packaging, private-label printing and OEM specifications are available on request. Packaging photos are available in the product gallery.
Successful Cases
BB fertilizer plant, Brazil
Blends Round Granule at 8% into a 16-16-16 BB fertilizer for the Brazilian cerrado market. The round shape eliminated a segregation complaint they had with a previous angular humic granule supplier. Labels the product as ‘humic-enhanced NPK’ at a premium price point.
Explore agriculture applications → Agriculture · Bulk BlendingOrganic fertilizer producer, Shandong
Co-granulates Round Granule with fermented chicken manure and amino acid powder in a disc granulator to produce a ‘humic-rich organic granular fertilizer’ (organic matter >45%, humic acid >10% on label). Sells into the fruit-tree market in northern China.
Explore agriculture applications →Full case studies with crop data are published in our application sectors.
Frequently Asked Questions
Can I dissolve this in water and use it as a liquid fertilizer?
No — and please don’t try. Only about 70% is water-soluble, and the remaining 30% (the insoluble humic matrix) will settle out as sediment, clog filters, and cause problems in emitters. This product is designed for dry blending into granular fertilizers, not for dissolution. If you need a soluble potassium humate/fulvate, look at our Type I or Type II flake/powder grades.
Why is the fulvic acid only 10%?
The disc granulation process and the raw material mix for this product are optimized for granule strength and physical properties, not for maximizing fulvic acid yield. The 10% fulvic / 25% humic profile is what’s economically achievable in a disc-granulated form while keeping the price competitive as a bulk-blending additive. If you need higher fulvic content in a granular form, consider our Extruded Granules I (Type I, 50% fulvic).
How does this compare to Extruded Granules I?
Extruded Granules I (Type I): 50% fulvic / 50% humic / 10-12% K₂O / 100% soluble / 2-4mm matte granules — a premium soluble granule for high-value applications. Round Granule: 10% fulvic / 25% humic / 2-5% K₂O / 70% soluble / 4-6mm round granules — a cost-effective bulk-blending base. Different products for different jobs.
What is the crush strength?
The disc-granulated round granules have good mechanical strength — they survive standard drum blending and conveyor handling without excessive breakage. If you need a specific crush strength number for your process (e.g., for a particular blender type), request it at enquiry stage and we’ll have it tested.
Can this be used in organic farming?
Our raw material source (leonardite) is naturally occurring and the product is mineral-based. Organic certification depends on your programme’s input standards. Share your certification body and programme, and we’ll check whether this grade qualifies.
Need a quotation or a sample?
Tell us your application, target market and packaging — we will come back with specification, price and lead time.
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