This grade exists for blenders and for cooperatives that buy prilled urea by the truck and want to lift nitrogen use efficiency without changing their spreading equipment. At 50% humic acid it is the economic grade in our range, dry, free flowing and with a low angle of repose so it meters through a volumetric blender without bridging in the hopper. Coated at 1-2% by weight on urea prills, it gives the prill a dark uniform film that slows hydrolysis in the first days after application and reduces the ammonia loss that rice farmers in Nueva Ecija and Isabela lose every wet season.
The practical gain most of our Philippine buyers report is 15-25% urea saved per hectare with the same visual crop performance, plus a field that does not go anaerobic-sour in the paddy corner where water stands longest. The anti-caking behaviour matters just as much commercially: coated urea does not set into blocks in a warehouse during the humid months, so the blender does not have to break bags with a hammer and the retailer does not get complaints about hard lumps.
We keep the moisture at 8% maximum and pack in a lined bag specifically because a 50% grade with 12% moisture will cake in a container crossing the equator. If your blender runs a rotary drum coater, tell us the drum speed and we will adjust the mesh; a 100 mesh powder sticks better than a coarse one on a slow drum, and a coarse powder runs cleaner on a high-speed line.
Key Features
- 50% humic acid economic grade: Delivers the nitrogen-efficiency benefit at roughly two-thirds the cost of a 70% grade, which suits high-volume rice programmes
- Free flowing below 35 degrees repose: Meters cleanly through volumetric and weigh-belt blenders without bridging or rat-holing in the hopper
- Anti-caking on coated urea: 1-2% coating keeps prills free in humid warehouse conditions and prevents block formation in the bag stack
- Reduces ammonia volatilisation: The humic film slows urea hydrolysis in the first 48 hours, the window where most nitrogen is lost from flooded paddy
- Low moisture, 8% maximum: Specified for sea freight and tropical storage; not the 12-14% material that cakes in a container
- Documentation for programme buyers: Batch COA, blending ratio sheet and retained sample available for cooperative tenders
Technical Specifications
| Parameter | Specification |
|---|
| Appearance | Black free flowing powder |
| Humic Acid (dry basis) | 50% min |
| Organic Matter | 65% min |
| Moisture | 8% max |
| Angle of Repose | Below 35 degrees |
| Coating Rate on Urea | 1-2% by weight |
| pH (1% suspension) | 8.0-10.0 |
| Particle Size | 100 mesh, 95% pass |
Applications
Coating: 1-2% by weight on urea, added in the rotary drum with a light water mist at 1-2% to fix the film, then cured for 30 minutes before bagging. Direct blend: 20-40 kg per ton of NPK blend for rice, or 30-50 kg per hectare as a separate basal pass. Also used at 100-150 kg per hectare in vegetable and corn programmes where soil organic matter is below 1.5%.
Do not store coated urea in a sealed container that has just carried molasses or a wet bulk cargo; the condensation will undo the coating. If your blender uses a hammer mill on the humic powder before coating, stop, because the fines generated will dust out of the drum and the coating weight will drift.
Packaging, Documentation & Quality Assurance
Packed in 25kg PP woven bags with PE liner, 40 bags per pallet, and in 1 ton jumbo bags with a discharge spout for blenders. Neutral printing is standard, and we can print your brand, coating ratio and mixing instructions on the bag for programme tenders.
Each batch is tested for humic acid, organic matter, moisture, pH, mesh and angle of repose. We keep a sealed retained sample for 24 months and can supply a pre-shipment sample to your blending plant so the coating trial is done on the actual lot, not on a generic sample. Third-party inspection at Qingdao is available on request at cost.
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