Humic Acid Urea is normal urea (46% N) that has been specially coated or chemically bonded with 3–5 % active humic acid from leonardite. The black humic layer makes nitrogen release slower (20–40 % less loss), helps urea stay longer in soil, reduces burning, and feeds roots + soil microbes at the same time.
Farmers call it “black urea” or “urea thông minh” – same 46 % nitrogen but works longer, safer, and gives darker green color and higher yield with less fertilizer.
Main Specification
| Parameter | Specification |
|---|---|
| Total Nitrogen (N, dry basis) | ≥ 44.0 % (typically 44.5 – 46.0 %) |
| Biuret Content | ≤ 1.0 % |
| Humic Acid Content | ≥ 2.0 % (typical 2 – 5 %) |
| Organic Matter (from Humic Acid) | ≥ 3.0 % |
| Moisture Content | ≤ 0.5 % |
| Particle Size (Prill) | 2.0 – 4.0 mm (≥ 95 %) |
| Particle Size (Granular) | 2.0 – 5.0 mm (≥ 90 %) |
| Crushing Strength (Prill) | ≥ 5.0 kg/prill |
| Bulk Density | 0.70 – 0.78 g/cm³ |
| pH (10 % solution) | 6.5 – 8.5 |
| Solubility in water | Gradual release (Humic Acid dissolves slowly) |
| Heavy Metals (Pb / As / Cd / Hg) | ≤ 10 / ≤ 5 / ≤ 2 / ≤ 1 ppm |
Main Functions & Benefits
- Provides high-analysis nitrogen (≥ 44 %) with slow-release characteristics
- Humic Acid coating reduces nitrogen volatilization and leaching by 20–40 %
- Improves nitrogen use efficiency (NUE) up to 30–50 % compared to plain urea
- Stimulates root growth and microbial activity due to Humic Acid
- Enhances soil cation exchange capacity and nutrient retention
- Reduces ammonia volatilization loss, especially in alkaline soils
- Improves soil structure and water-holding capacity over time
- Increases crop yield by 8–25 % (rice, wheat, corn, sugarcane, vegetables)
- Environmentally friendly – lowers nitrate pollution and greenhouse gas emission
Usage
- Basal application (broadcast or band placement)
- Top-dressing for rice, wheat, maize, sugarcane
- Side-dressing for vegetables and row crops
- Mechanical spreading with fertilizer spreader
- Suitable for both flooded rice and upland crops
Recommended Application Rate
- Rice, wheat, maize: 100–250 kg/ha (depending on soil and crop)
- Sugarcane: 300–500 kg/ha
- Vegetables & horticulture: 150–400 kg/ha
Packaging
- 50 kg PP/PE woven bag with inner liner
- 25 kg multi-wall kraft + PE bag
- 500 kg / 1000 kg jumbo bag (FIBC)
- Private label & customized printing available
Key Advantages vs Plain Urea
- Higher nitrogen efficiency → reduces 1–2 applications per crop cycle
- Lower volatilization loss (up to 40 % less ammonia loss)
- Better crop response and yield increase
- Contains natural Humic Acid → additional soil conditioning effect
- Dark color helps absorb heat → faster germination in cool seasons
- Approved for use in conventional and sustainable farming systems
Storage
Store in cool, dry, well-ventilated warehouse. Avoid direct sunlight and rain. Stack max. 10 bags high.
Shelf Life
Minimum 3 years in original sealed packaging.