Durian growers in Chanthaburi and Chumphon run expensive drip systems, and the single most common complaint we hear about humic acid is that it plugs the emitters. The cause is almost never the humic acid itself, it is the insolubles and the fines that come with cheap 70% grades. This grade is the answer to that complaint: 95% humic acid, 99.9% water soluble, 0.1% maximum insoluble matter, milled to 200 mesh and then air classified so what you dissolve stays dissolved.
In practice a grower dissolves 3-6 kg per hectare in the fertigation tank, runs it through the venturi and does not have to strip the laterals at the end of the month. On a 200-rai orchard with 400 emitters this matters more than the price difference per ton. The high humic content also means less inert material going into the root zone, which is relevant when the same block receives a full nutrient programme every week and salinity in the wetted bulb is already creeping up.
We recommend it for the two critical windows in durian: the flush before flowering, and the fruit fill stage from week six to week twelve after fruit set. Applied in those windows, the effect growers report is more consistent fruit set on the outer branches and less of the uneven fruit size that comes from a root system that is only wetted in one sector of the drip circle.
Key Features
- 99.9% solubility, 0.1% insolubles: Tested through 120 mesh filters and pressure-compensating emitters for 30 days continuous injection without flow loss
- 95% humic acid, minimal inert load: Less ballast salt entering the wetted bulb, which matters on blocks already running high EC
- 200 mesh air classified powder: Dissolves in under four minutes at 25 C with moderate agitation, no overnight soaking required
- Formulated for venturi and Dosatron: No foaming agent, no anti-caking additive that leaves a film on the tank wall
- Two-window application fit: Matched to the pre-flowering flush and the fruit fill stage where the return per kilo is highest
- Batch COA and retained sample: Every lot assayed for humic acid, solubility and insolubles; sample kept 24 months
Technical Specifications
| Parameter | Specification |
|---|
| Appearance | Black micro powder |
| Humic Acid (dry basis) | 95% min |
| Water Solubility | 99.9% min |
| Insoluble Matter | 0.1% max |
| Particle Size | 200 mesh, 98% pass |
| Moisture | 10% max |
| pH (1% solution) | 9.0-10.5 |
| Dosage in fertigation | 3-6 kg/ha per cycle |
Applications
Fertigation: 3-6 kg per hectare per cycle, dissolve in the mixing tank at 1:1000 first, then inject at 1:200 into the line. Pre-flowering flush and fruit fill are the two key windows; a lighter pass after harvest helps root recovery. Foliar: 0.5-1 g per litre with a sticker, sprayed early morning. Nursery and young tree: 2-3 g per litre as a drench every 14 days.
Dissolve in clean water below 400 ppm hardness. In harder water, pre-acidify the tank to pH 6.5 before adding the powder, otherwise a calcium humate haze forms and that haze is what actually blocks drippers. Never mix directly with calcium nitrate in the same tank.
Packaging, Documentation & Quality Assurance
Packed in 25kg multiwall paper bags with an inner PE liner, 20 bags per pallet, or 1 ton jumbo bags for orchards mixing on site. Also available in 1kg and 5kg foil-lined trial packs for distributor sampling. Store on pallets under cover; the powder is hygroscopic and will cake if the bag is left open in a humid packing shed.
Each lot carries a COA covering humic acid, solubility, insolubles, moisture and pH, plus a heavy metal screen on a quarterly composite. We retain a sealed 500g sample for 24 months. For buyers who need independent verification, SGS or BV inspection at Qingdao can be arranged before loading, and we will courier a pre-shipment sample with the batch code written on the bag so your own lab can confirm it matches on arrival.
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