Fertilizante de ácido húmico
— Bulk Manufacturing
& Sourcing for Importers
Lignite-derived humic acid and potassium humate — from 2–4 mm granular soil grade to 98%-soluble flake and powder — direct from our Jiangxi, China manufacturing base, exported to 20+ countries with a per-batch COA on every shipment.
// sent within 24 hours · no account needed
What it actually is — and where bulk buyers get burned
Two containers both labeled "humic acid fertilizer" can differ by a factor of four in the number that actually matters. One is a functional soil input; the other is low-grade lignite dust with a percentage printed on the bag.
The trap is the headline "humic acid %." A cheap lignite granule may carry far less extractable humic acid than a flake refined from high-grade leonardite — and because leonardite is a coal derivative, heavy metals (arsenic, cadmium, lead) have to be tested, not assumed. That is exactly what stops EU and Korea shipments at the port.
The only document that separates a real grade from a certificate-with-salt is the COA — not the label.
Find the right grade for your market
Our granular, powder and flake humic acid grades sit on one ladder — humic-acid content and water-solubility climb together, and so does price. Three grades cover almost every bulk order.
Not sure whether to buy granular, soluble powder/flake or finished liquid? See our buyer guide to granular vs liquid vs powder humic acid before you lock the grade and freight plan.
Lignite Humic Acid Granule
2–4 mm black-brown granule for base application and blending into compound fertilizer. Alkaline-soluble only — works in the soil, not the spray tank. Volume grade for broadacre conditioning.
Potassium Humate Granule 0-0-6
Refined to ~41.5% humic acid and 93% water-soluble, with 6% K₂O built in. Dissolves for drip lines yet ships as a stable granule. The middle grade for field-scale potassium + humic.
Potassium Humate Flake 1-0-11
The top grade — ~56.5% humic acid, 98% water-soluble, 11% K₂O, near-zero residue. Black flake or soluble powder where solubility and low insolubles decide the sale.
★ Which grade should you stock?
- Your buyers run drip / fertigation or foliar programs
- Insolubles / tank residue would kill the sale
- You need a high humic-acid % on the COA
- You want built-in potassium (K₂O 11%)
- Your buyers soil-apply and blend into compound NPK
- Cost per tonne is the deciding factor
- You move high volume for broadacre conditioning
- You need a functional conditioner, not solubility
▸ Not sure which your buyers need? Tell us the application and target crop — we'll recommend a grade and send the matching spec sheet.
Specifications & technical data
Use this as your COA-review checklist. The 3-grade capability matrix publishes our standard soil grade, our best soluble grade, and the maximum-concentration grade we produce.
| Parâmetro | Standard — Lignite HA Granule | Best — K-Humate Granule 0-0-6 | Maximum — K-Humate Flake 1-0-11 |
|---|---|---|---|
| Ácido húmico | confirm on live COA + method | 41.5% | 56.5% |
| Solubilidade em água | alkaline-soluble (soil) | 93% | 98% |
| K₂O | 0.7% | 6.35% | 11.12% |
| Total N | 0.33% | 0.98% | 1.21% |
| Matéria orgânica | 21.29% | 60.13% | 65.13% |
| pH | near-neutral / alkaline | 8.96 | 9.96 |
| Umidade | — | 2.5% | 1.5% |
| Physical form | 2–4 mm granule | 2–4 mm granule | flake / powder |
| Best use | soil base, blending | drip + soil, K supply | fertigation, foliar |
Verify on every humic COA before ordering
- 1Humic acid % and test method — a "70%" measured one way can equal a "45%" another. Confirm the method is the same across quotes.
- 2Water-solubility / insolubles — for drip and foliar, insolubles clog emitters and coat leaves.
- 3Heavy metals (As, Cd, Pb, Hg) — confirm against Regulation (EU) 2019/1009 cadmium limits before booking freight.
- 4Fonte — lignite vs high-grade leonardite changes both the HA yield and the heavy-metal profile.
Industries & applications
Humic products are rarely one-size — the application decides the grade.
For arid or coastal programs dealing with salt-affected or sandy ground, see our guide to humic acid for saline and sandy soils before choosing the soil-incorporated granule and fertigation grade.
Broadacre & field crops
Lignite granule blended into base NPK — the volume-mover for row-crop distributors.
Drip horticulture
Potassium humate granule or flake through the drip line for root flush and cation exchange.
Foliar & fertigation
The 98%-soluble flake, where low insolubles and clean tank mixing are non-negotiable.
NPK blenders (OEM)
Humate as a functional additive — often co-blended with our Fertilizante de aminoácidos.
★ Common challenges → our grade response
| Buyer's problem | Grade / spec response |
|---|---|
| Emitters clogging on "soluble" humate | 98%-soluble flake (1-0-11), low insolubles — confirm on COA |
| EU shipment held on cadmium | request heavy-metal COA against EU 2019/1009 before booking freight |
| Paying premium % that doesn't perform | confirm HA test method; a soil crop rarely needs the flake grade |
| Need K + humic in one line item | potassium humate granule 0-0-6 or flake 1-0-11 (built-in K₂O) |
How we know a batch is what the label says
Most humic suppliers ask you to trust a percentage. We would rather hand you the means to check it — because on a coal-derived input, that percentage is the easiest number on the page to move.
"A humic acid percentage without the test method next to it is a marketing number, not a spec. The same lot can read 70% one way and 45% another — nobody is lying, they just measured differently. So we quote the method with the figure, every time. And because leonardite is a brown-coal layer, we treat the heavy-metal panel as part of the identity of the batch, not as an extra you pay for."
— Rutom Bio Humic Process & QC TeamThe matrix above is everything — standard granule, 93%-soluble granule, 98%-soluble flake. There is no hidden fourth grade kept for better customers.
The ceiling is the ore — ~56.5% HA at 98% solubility is near the top of refining. We can't match a "90%+" claim without quietly changing the test method.
Every figure is checkable against a document you hold — the per-lot COA, the third-party re-test, and a certificate that lists your SKU in scope or doesn't.
Certifications, quality & export compliance
A certificate is a claim about a system or a product category — it is not evidence about the batch in your container. For a coal-derived input, that gap is exactly where EU and Korea shipments get stopped. So this section separates the two: what we hold, what each document actually proves, and the packet to request so you're buying evidence, not a logo.
- ✓Organic: ECOCERT, CERES, EU organic scope must be confirmed by SKU and certificate copy.
- ✓Systems: ISO 9001 (quality) and ISO 14001 (environmental)
- ✓Per-batch QC: every batch tested in-house or by SGS before shipment; COA per lot
- ✓Export: experienced with CIQ inspection for fertilizer products
| Document held | What it proves | What it does NOT prove |
|---|---|---|
| ECOCERT / CERES / EU organic | Input is approved for certified-organic production — by certifier and specific product in scope | Heavy-metal levels or HA% of any batch; that your SKU is in scope unless the cert lists it |
| ISO 9001 | A quality-management system is in place and audited | That any individual batch meets your spec |
| ISO 14001 | An environmental-management system is in place | Anything about product quality or purity |
| Per-lot COA | The actual figures for this batch — HA%, test method, heavy-metal panel | (this is the batch evidence — just confirm the HA test method) |
The takeaway: organic and ISO certificates prove eligibility and process; only the per-lot COA proves the material. Anyone selling on the certificate alone is selling you the logo, not the batch.
What to request from any humic supplier — us included — so you hold evidence rather than claims. Paste this straight into a PO:
- 1Per-lot COA — HA % with the test method stated + heavy-metal panel (As, Cd, Pb, Hg). Proves this batch.
- 2Organic certificate copy that lists your SKU in scope, with number and validity.
- 3ISO 9001 / 14001 certificate copies. Proves the systems behind the batch.
- 4Certificate of Origin + the HS code we declare on export.
- 5Third-party test report (e.g. SGS) on request. Independent verification of the COA figures.
What we don't claim (honest boundary)
- Organic certification applies by certifier and by specific product — confirm in writing whether the SKU you order is within ECOCERT / CERES / EU-organic scope.
- We don't claim certifications we don't hold for a given market; if your destination needs USDA NOP or JAS, ask and we'll confirm what is and isn't in place.
- We don't publish a single "humic acid %" without stating the test method behind it.
- "CIQ export experience" is customs-clearance experience, not a product safety approval for your destination.
Landed cost & HS classification
The FOB price on a humate quote is not what the product costs you delivered. For a China-origin order, the number that hits your margin is the landed cost — and two lines surprise first-time importers.
| Landed-cost factor | What to check | How we help |
|---|---|---|
| FOB unit price | quote for your exact grade + packaging | grade-specific quote, no "typical %" hand-wave |
| HS classification & duty | declared under HS 3101 / 3105 / 3824 depending on form & destination — duty differs by code | we state the code we declare on export; you confirm your import rate |
| Freight + moisture weight | soluble flake ships more active humic per tonne than a moist granule | flake grade cuts freight per unit of active humic |
| Quality-escape cost | rework, clogged drip lines, port hold on heavy metals | per-batch COA + heavy-metal panel before shipment |
Two calculators — no account, no gated PDF
Both run on the specifications published above plus the numbers you type in. Neither returns a price; both narrow the decision before you talk to anyone.
Humic Grade Selector
Enter your application, and whether you need built-in potassium — it returns the matching grade from the matrix above.
Active-Humic Freight Comparator
You don't ship humic acid — you ship humic acid plus whatever else is in the bag. Active humic per tonne = HA% × (1 − moisture).
| Grade | HA | Umidade | Active/MT |
|---|---|---|---|
| K-humate granule 0-0-6 | 41.5% | 2.5% | ~405 kg |
| K-humate flake 1-0-11 | 56.5% | 1.5% | ~557 kg |
// honest limit: if your buyers soil-apply and blend into NPK, the cheap granule is the right answer and this math is irrelevant.
▸ Run either tool, then send the result with your port and volume — we'll quote against exactly that.
Get a humic acid & potassium humate quote
Decided by a line on the COA rather than the price per tonne. Send us your target grade, destination port, and monthly volume — we'll return a grade spec sheet, a moisture-adjusted FOB quote, and the HS code we declare, within 24 hours.
Request an evaluation sample; lead time confirmed on reply.
Request a sample →— Rutom Bio Technical Supply Desk · Last updated 2026-07-13
Frequently asked questions
Price tracks grade, not the headline percentage. Lignite soil granule is cheapest per tonne; 98%-soluble potassium humate flake sits at the top because solubility and low insolubles cost more to refine. Potassium humate also carries built-in K₂O, which moves the price with potash. For an accurate FOB figure, send the target grade, packaging, destination port and monthly volume — we quote within 24 hours.
Potassium humate is the potassium salt of humic acid — it's what makes the product water-soluble. Raw lignite humic acid is only alkaline-soluble (a soil grade); reacting it with potassium gives the 93–98% water-soluble granule and flake grades used in drip and foliar, and adds 6–11% K₂O. Same humic backbone, different solubility and potassium. For a full comparison of humato de potássio x ácido húmico, including solubility, K₂O and when to use each, see our buyer's guide.
Humic acid is extracted from leonardite, a brown-coal layer, so heavy metals (arsenic, cadmium, lead) must be tested rather than assumed. For EU-bound shipments, confirm the cadmium result against Regulation (EU) 2019/1009 limits. We provide a per-batch heavy-metal panel on request; confirm the specific figures for your SKU and destination before booking freight.
Humic acid and potassium humate are commonly declared under HS heading 3101 (animal or vegetable fertilizers), but depending on product form and your destination customs the classification can differ (e.g. 3105 or 3824), and duty follows the code. We tell you the code we declare on export; confirm the import classification and duty rate with your customs broker before you commit.
Use the 98%-soluble potassium humate flake (1-0-11) or, for a mid-grade, the 93%-soluble granule (0-0-6). Avoid the lignite soil granule in any tank — it's alkaline-soluble only and its insolubles clog emitters and coat leaves. For foliar, confirm the low-insolubles figure on the COA.
It's a soil conditioner and biostimulant, not an NPK replacement — it improves nutrient uptake and soil structure but won't supply nitrogen or phosphorus on its own. Very high or repeated rates can raise soil pH (the humate grades are alkaline, pH ~9), so on already-alkaline soils use it as part of a balanced program.
Yes. We supply from full-pallet to FCL volumes and support custom blends (humic + potassium, humic + amino acid) and private-label packaging through a 3-step process: confirm your need, finalize the recipe, then production. MOQ and documentation timelines for OEM orders are confirmed within 3 business days.
Yes. As a direct humic acid fertilizer manufacturer we ship wholesale and bulk volumes in granular (2–4 mm), soluble powder and flake grades, plus humic acid / potassium humate in liquid (fertigating) form on request. Tell us the form, grade and monthly volume and we'll return an FOB quote with a per-batch COA.
English 
Spanish 
French 
Japanese 
Korean 
German 
Portuguese 
Italian 
Indonesian 
Vietnamese 
Turkish 
Persian 
Russian 
Chinese