اسید هومیک: گرانولی در مقابل مایع در مقابل پودری — چگونه فرم مناسب را انتخاب کنیم

The form is not a quality decision. Granular, liquid, and powder humic acid can come from the same leonardite and carry the same active humic; what changes is how it dissolves, how it’s applied, and, for anyone importing it, how much water you pay to ship across an ocean. Buy the wrong form and you either can’t put it through your customer’s drip line or you spend a container of freight moving water.

The three forms sort out cleanly once you separate two questions: how the grower applies it, and how you get it to port. Below: a side-by-side table, the shipping math most guides skip, and a sourcing rule that saves importers a freight bill.

Granular vs Liquid vs Powder Humic Acid: The Short Answer

Choose the form by application and by freight, not by which one sounds strongest. Granular humic acid is the slow, cheap soil grade; liquid is the fast, ready-to-use grade that is mostly water; soluble powder and flake sit in the middle, dry and highly soluble. For a grower, the split is speed versus persistence. For an importer, the split is dry versus wet, because dry forms ship far more active humic per tonne.

The short version for buyers: soil and blending customers want granular; drip and foliar customers want a soluble grade. And if you are importing across an ocean, buy the soluble powder or flake and let the liquid be made near the customer, because shipping finished liquid means shipping water.

Is liquid or granular humic acid better?

Neither is better in general; they do different jobs. Liquid works fast and suits foliar and fertigation, but it is largely water and costs more per unit of active humic. Granular is cheaper and lasts longer in the soil, but it is alkaline-soluble only and slow to act. The honest answer is application-dependent, which is why many distributors stock both.

The Three Forms at a Glance

The table maps the three forms against the properties that decide a purchase order. Solubility and active-humic figures for our grades are our published product specifications; confirm exact numbers on the COA for the SKU you order.

Reference values from our published product specifications; confirm against the live COA.

What Each Form Actually Is

The three forms are the same humic material in different physical states, and each state exists to solve a different problem. Understanding what each one is makes the choice obvious.

Granular humic acid

Granular humic acid is the raw, dry soil grade. Our humic acid granule ships as a 2–4 mm black-brown granule extracted from leonardite, and it works in the ground rather than the tank. It is alkaline-soluble only, so it will not fully dissolve in a neutral drip line, and it releases slowly over a season. That slow release is a feature for soil conditioning and a problem for anyone who needs speed. Granular is the cheapest form per tonne and the volume-mover for broadacre and compound-blend customers.

Powder and flake (soluble grades)

Soluble powder and flake are the dry, high-solubility middle grade, and for most B2B buyers this is the workhorse. These are usually potassium or sodium humate, refined so they dissolve in water at any pH. Our potassium humate flake 1-0-11 runs about 56.5% humic acid at 98% solubility, and the potassium humate granule 0-0-6 is a 93%-soluble dry grade. Because they ship dry, they carry the most active humic per tonne of freight, then dissolve into a liquid at the destination.

Liquid humic acid

Liquid humic acid is a soluble humate already dissolved in water, sold ready to spray. It is the most convenient form for the end user and the fastest-acting, which is why growers like it. The catch sits on the label of every jug: it is typically 80–90% water. That convenience is real, but it is the reason liquid is the most expensive form per unit of active humic and the worst one to ship long distances.

One more thing about liquid trips up buyers comparing quotes: its humic acid percentage swings widely. Liquid products run anywhere from about 5% to 20% humic acid depending on how much water the maker left in, so two liquids at the same jug price can differ two- or three-fold in active material. A liquid is only as strong as its humic acid line on the COA, and that line moves far more between suppliers than it does for a dry grade.

نکته کلیدی: liquid is not a stronger humic acid. It is a soluble humate with water added, and the water is the part you pay to move.

Powder vs flake: does particle size matter?

Only for handling, not for chemistry. Soluble powder and flake are the same humate material milled to different sizes, so they carry the same active humic and the same solubility class. Flake tends to dissolve with less airborne dust and pours cleanly in volume, which matters when a worker is charging a mixing tank from 25 kg bags all day. Powder dissolves a touch faster and blends more evenly into dry formulations. Choose flake for clean bulk handling and powder for fast dissolving or dry blending; the COA numbers should read the same either way.

The Water-Freight Penalty: Why Importing Liquid Humic Rarely Pays

The most expensive mistake an importer makes with humic acid is booking freight on liquid. Call it the Water-Freight Penalty — the cost of shipping water across an ocean when you could have shipped the dry material and added the water at the destination. On a China-to-port lane, it quietly doubles or triples the landed cost of the active humic that actually does the work.

The math is simple once you count active humic rather than gross tonnes. Active humic per tonne is roughly the humic acid percentage times (1 minus water content). A soluble flake at ~56% humic acid and ~1.5% moisture carries around 550 kg of active humic per tonne shipped. A finished liquid at a representative 12% humic acid carries around 120 kg per tonne, because the rest is water.

To move 10 MT of active humic, that is roughly 18 MT of flake versus about 83 MT of liquid. You are booking four to five times the freight, four to five times the duty, and far more storage, to deliver the same working material. Plug in the actual humic acid percentage from your liquid supplier’s COA and the gap is usually just as wide.

Decision rule: for anything crossing an ocean, import the dry form and reconstitute the liquid near the customer. Ship water only over the last mile, never the first ten thousand.

Can you make liquid humic acid from powder?

Yes, and for importers it is usually the smarter play. Soluble potassium humate powder or flake dissolves fully in water at any pH, so a distributor can import the dry grade and mix a liquid to the concentration their market wants, close to the customer. That avoids the Water-Freight Penalty and lets one dry SKU serve both dry and liquid demand.

Solubility & Application: Which Form for Soil, Drip & Foliar

Application decides the form more than any other factor, and it comes down to solubility. A grower who tills product into the soil and a grower who runs it through emitters need physically different grades, and mixing that up is where returns come from.

For soil base dressing and blending into compound NPK, granular is the right answer. It does not need to dissolve; it works in the ground over the season, and it is the cheapest way to move humic acid into a field. Solubility is not a benefit here, so paying for it is waste.

For drip irrigation and fertigation, the grade has to dissolve without leaving insolubles that clog emitters. Soluble powder, flake, or a liquid made from them is the only safe choice. For foliar spray, the tolerance is tighter still, since insolubles coat leaves and block nozzles, so the highest-solubility grade earns its premium.

Application rate follows the form as well, because the active humic differs so much between them. Dry soluble grades are dosed by weight, often a fraction of a percent to a couple of percent in a fertigation solution, so a little goes a long way. Liquid is dosed by volume and needs more product to deliver the same active humic, which is another reason its cost per treated hectare runs higher than the jug price suggests. Whatever the form, the meaningful number is grams of active humic reaching the crop, not litres or kilograms of product, so convert both to active humic before you set a rate or compare two quotes.

Does granular humic acid dissolve in water?

Raw granular humic acid does not fully dissolve in neutral or acidic water; it is alkaline-soluble only, so a portion settles out and can clog a drip line. A soluble granular grade, meaning a potassium or sodium humate pressed into granules, does dissolve. If a supplier calls a granule “water-soluble,” ask whether it is raw humic acid or a humate salt, and ask for the solubility figure on the COA.

Field note: the word “soluble” on a granule means nothing without the salt named and a solubility percentage next to it.

When to Choose Which

Match the form to the customer’s application first, and the grade decision follows. The three forms are complements across a distributor’s book, not rivals for a single slot.

The form choice also reads differently across the buyer’s own team. A purchasing manager sees the freight and storage cost and leans dry. A field agronomist sees the application method and asks whether it dissolves clean. A warehouse manager sees drums that freeze and floor space that fills with water weight. All three point the same way for imported stock, which is why the dry grade is the easier internal sell once someone runs the numbers past the FOB line.

For a distributor building a humate line, the common answer is a cheap granular for soil customers plus a soluble powder or flake for everyone who needs a tank-ready grade. Between them they cover almost every order, and the powder doubles as the raw material for any liquid you choose to blend. For the deeper question of which salt sits behind a soluble grade, our guide on اسید هومیک برای گیاهان covers the agronomy side.

The Dry-Import Play: Buy Powder, Make Liquid on Arrival

The sourcing move that separates a sharp importer from a casual one is refusing to ship finished liquid. Buy the dry soluble grade, and make liquid near the customer if the market wants it. This single decision fixes three costs at once.

Freight drops, because you are moving active humic instead of water. Storage and handling drop, because dry flake in bags stacks denser and lasts longer than drums of solution. And flexibility rises, because one dry SKU can be sold as-is to dry customers or dissolved to whatever concentration a liquid buyer specifies. A container of soluble flake becomes several tankfuls of liquid at the destination.

There is a limit worth stating plainly. If your market is genuinely local and small, and the convenience of a ready-to-use jug is what closes the sale, then a locally sourced or blended liquid can be the right product. The Water-Freight Penalty is an argument against importing liquid across an ocean, not against liquid as a form. Decision rule: import dry, decide on liquid at the destination.

Storage, Shelf Life & Handling: The Hidden Form Cost

Freight is not the only cost that changes with form; storage and shelf life do too, and they favour the dry grades again. This is the part of the decision that agronomy guides skip and that a distributor discovers in the warehouse.

Dry granular, powder, and flake store for two years or more in sealed 25 kg bags, stack densely on pallets, and shrug off temperature swings. A drum of liquid is a different animal. Solutions can settle or stratify over time, they lose usable life faster once opened, and in cold climates they can freeze, which damages both the product and the container. Drums and IBCs also eat far more warehouse floor per unit of active humic than bagged dry grade, because most of what you are storing is water.

There is a handling trade the other way, and it is honest to state it. Liquid needs no dissolving, so a nearby end user can spray it straight from the drum, while dry grade has to be mixed into solution before it goes through a tank. That convenience is real at the point of use. It just does not survive an ocean and a year in a warehouse, which is why it belongs to the local last mile, not to the import decision. Field note: count the warehouse and shelf-life cost, not only the FOB price, when you compare a drum of liquid against a bag of flake.

How to Verify Quality by Form

A humic COA is read differently depending on the form, and two lines matter more than the headline percentage. Check these before any order, against the per-lot certificate of analysis rather than the brochure.

1. Humic acid % with the test method stated. The single most gamed number; the same material reads high or low by method, so confirm the method is identical across quotes before comparing percentages.
2. Water content or moisture (for liquid especially). This is what tells you how much of the tonne is active material and how much is water. For liquid, it is the number that governs your real cost per active humic.
3. Water-solubility and insolubles (for powder, flake, and liquid). For drip and foliar, this is the line that decides the sale; ask for the figure, not the word “soluble.”
4. K₂O (for potassium humate grades). Confirms a soluble grade is a genuine potassium salt, not raw humic acid relabelled.
5. Heavy metals (As, Cd, Pb, Hg). Leonardite is brown coal, so confirm the panel, and check cadmium against Regulation (EU) 2019/1009 for EU-bound orders.

Key takeaway: for liquid, the moisture line is the price line; for granular, the solubility line is the fitness-for-use line. Read the one that matches the form.

Sourcing Notes: Freight, Packaging & MOQ by Form

Once the form is settled, the sourcing questions converge, with freight as the variable that most changes by form. Dry granular and powder ship in 25 kg bags on pallets up to full-container loads; liquid ships in drums or IBCs and carries its water weight the whole way.

Both dry and liquid humic products are commonly declared under HS heading 3101, though depending on form and destination the classification can shift to 3105 or 3824, and duty follows the code. We state the code we declare on export; your customs broker confirms the import rate. Private-label packaging and custom blends are available on request for any of the three forms.

Packaging tracks the form too, and it changes what fits in a container. Dry granular and flake load as 25 kg bags on pallets, so a standard container carries close to its weight limit in active humic. Liquid in drums or IBCs hits the volume limit long before the weight limit, because most of the load is water, so you ship fewer kilograms of active humic per container and pay to move the rest. When you compare an FOB price per tonne across forms, normalise it to price per tonne of active humic first, or the dry grades will look more expensive than they are.

The full grade matrix, three-tier specifications, and landed-cost detail live on our کود اسید هومیک sourcing page, which is the place to compare grades and request a form-specific quote before you commit freight.

Industry Outlook: Why the Soluble Dry Forms Keep Gaining

The form mix is shifting toward soluble dry grades, and the reason is structural rather than seasonal. As drip irrigation and fertigation spread across high-value horticulture in arid and coastal export markets, demand tilts toward grades that dissolve cleanly in a tank. Raw granular cannot serve that segment, and imported liquid serves it expensively. Soluble powder and flake sit exactly in the gap: they ship dry, then become the liquid a fertigation program needs at the destination.

Two forces reinforce the shift. Freight and duty scrutiny make shipping water across an ocean harder to justify each year, so more buyers reconstitute liquid locally from imported dry grade rather than paying to move it finished. At the same time, raw granule keeps its place in broadacre and compound-blend demand, so this is not liquid-versus-dry so much as the soluble dry grades taking share of the tank-fed segment. A distributor planning inventory for the next few years is stocking more soluble flake and powder, and importing less finished liquid, than they would have five years ago. Size the soluble side of the book to where the irrigation is going, not where it has been.

The Buyer’s Bottom Line

• Form is an application and freight decision, not a quality one. The same active humic sits in all three.
• Granular for soil and blending; soluble powder or flake for drip and foliar; liquid for ready-to-use convenience.
• Compare on active humic per tonne, not gross price. Liquid is 80–90% water.
• For anything crossing an ocean, import the dry form and make liquid on arrival. That is the Water-Freight Penalty avoided.
• Read the COA line that matches the form: moisture for liquid, solubility for granular and powder.

سوالات متداول

Which is cheaper, granular or liquid humic acid?

Granular is cheaper per tonne and usually per unit of active humic, because liquid is 80–90% water and you pay to ship and store that water. Liquid can still be the right choice for a nearby ready-to-use market, but for importing across an ocean the dry forms deliver far more active humic per freight tonne. Compare on cost per unit of active humic, not on the jug or bag price.

Can I use granular and liquid humic acid together?

Yes, and many programs do. Growers often apply granular humic acid to the soil for season-long structure and use a soluble grade through the drip line or as a foliar spray for fast uptake. They target different jobs, so combining them is common rather than redundant.

What is the difference between humic acid powder and granular?

Both are dry, but powder is usually a refined, highly soluble humate that dissolves in water at any pH, while raw granular humic acid is alkaline-soluble only and works in the soil. Powder suits drip, fertigation, and foliar; granular suits soil base dressing. Confirm the solubility percentage and, for powder, the K₂O figure on the COA.

How much liquid humic acid equals granular?

It depends entirely on the active humic percentage of each, which is why you convert to active humic before comparing. A dry flake at ~56% humic acid carries far more active material per kilogram than a liquid at ~12%, so a small weight of dry grade can replace a much larger volume of liquid. Always work from the humic acid percentage and moisture on both COAs.

Is powder or flake humic acid better for fertigation?

Both work well for fertigation as long as the solubility is high and insolubles are low; flake and soluble powder are effectively the same material in different particle sizes. Flake often dissolves with less dust and is easier to handle in volume, while powder dissolves a touch faster. For drip systems, confirm the insolubles figure on the COA regardless of which you choose.

Does liquid humic acid go bad in storage?

Liquid humic acid has a shorter usable life than dry grades and can settle, stratify, or freeze in cold storage, which is one more reason importers lean toward the dry forms. Sealed dry granular, powder, and flake keep for two years or more. If you do stock liquid, keep it above freezing, reseal opened drums, and use within the supplier’s stated shelf life. Confirm that shelf-life date before you commit to a large volume.

— Reviewed by Rutom Bio Technical Supply Desk

Last updated: 2026-07-20

مقالات مرتبط

• Humic Acid Fertilizer: Supplier, Grades & Bulk Sourcing, the money page — use this when you’re ready to compare grades and request a form-specific quote.
• اسید هیومیک برای گیاهان, the agronomy side — use this when the question is how humic acid behaves in soil, crop by crop.
• پتاسیم هومات پرک ۱-۰-۱۱, the top soluble grade — use this when a customer needs a tank-ready dry grade for drip or foliar.

Choosing a Humic Acid Form for Your Market?

Tell us the application (soil, drip, or foliar), the form you’re considering, and your monthly volume, and we’ll return a form recommendation, a moisture-adjusted FOB quote, and a COA sample within 24 hours.

Request a Form Recommendation & FOB Quote →

درباره این راهنما

Reviewed by the Rutom Bio Technical Supply Desk. Last updated 2026-07-20. The solubility and active-humic figures cited here are our own published product specifications; the freight math is worked from those figures and standard moisture assumptions, shown so you can run your own numbers. We manufacture all three forms, which is why this guide leads with the shipping and sourcing detail that agronomy-only pages leave out. Treat the liquid percentages as representative ranges and confirm the exact figures against the per-lot COA for the SKU you order.

مراجع و منابع

1. What Are Humic Substances? — International Humic Substances Society (definition and pH-solubility behaviour of humic acid).
2. Regulation (EU) 2019/1009 — European Union fertilising products regulation (heavy-metal and cadmium limits).
3. Rutom Bio published product specifications — humic acid granule, potassium humate granule 0-0-6, and flake 1-0-11 grade data.