Controlled-Release / Coated Urea
Polymer- and Sulfur-Coated Urea
30–360 Day Release | Controlled Nitrogen Fertilizer
Controlled-release and coated urea fertilizers regulate nitrogen release through polymer or sulfur coatings. Different release periods and coating specifications are available for crops, turf, landscaping, and other applications.
Product Center
What will you get when touch？
✔ Quick & helpful reply within 6 hours.
✔ Tailored solutions for your project.
✔ One-stop product, tech, market
- Risso provides customized controlled-release urea tailored to your specifications, with flexible release periods, coating options, sample support, and testing to ensure consistent quality and release performance.
Polymer Coated Urea
180 Day PCU Urea
270 Day PCU Urea
360 Day PCU Urea
Sulfur Coated Urea
Welcome to Our Controlled-Release Urea Product Range
Risso’s Controlled-Release Urea is a nitrogen fertilizer designed to release nitrogen gradually over a controlled period. It helps maintain a more consistent nitrogen supply, improve nitrogen-use efficiency, and reduce nutrient losses compared with conventional urea.
Our range includes Polymer-Coated Urea (PCU), Sulfur-Coated Urea (SCU), and other coated urea and slow-release formulations. Different release periods, coating systems, granule sizes, and packaging options are available for agricultural and commercial applications.
Risso supplies controlled-release urea to fertilizer distributors, manufacturers, commercial farms, and agricultural projects worldwide.
👉 Explore Our Controlled-Release Urea Products
Key Features of Controlled-Release Urea
- Controlled Nitrogen Release – Gradually supplies nitrogen over a designed release period.
- Coating Technology – Available with polymer or sulfur coatings to regulate nitrogen release.
- High Nitrogen Content – Urea-based products typically contain approximately 46% nitrogen.
- Flexible Release Periods – Products can be designed for different release durations, including 60–90 days or longer.
- Improved Nitrogen Efficiency – Helps reduce nitrogen losses and maintain nutrient availability.
- Multiple Product Types – Includes PCU, SCU, and slow-release polymer urea.
- Custom Specifications – Release period, coating system, granule size, and packaging can be customized.
Benefits of Controlled-Release Urea
Consistent Nitrogen Supply
Controlled-release urea provides nitrogen gradually, helping better match nutrient availability with crop demand.
Improved Nitrogen-Use Efficiency
Controlled nitrogen release can help reduce losses from volatilization and leaching while improving fertilizer utilization.
Fewer Applications
Longer release periods can reduce application frequency and simplify fertilizer management.
Flexible Crop Applications
Controlled-release urea is suitable for field crops, horticultural crops, turf, landscaping, and other applications requiring extended nitrogen availability.
Controlled-Release Urea Specifications
4. Slow Release Polymer Urea (30-270 days)
| Parameter | Specification |
|---|---|
| Total Nitrogen (N) | 44% – 46% |
| Biuret Content | ≤ 1.0% |
| Moisture Content | ≤ 0.5% |
| Granule Size | 2.0 – 4.8 mm |
| Appearance | Yellow, green, or blue granules |
| Release Longevity | 30, 60, 90, 120, up to 180 days, depending on coating thickness |
| Release Mechanism | Temperature and moisture-dependent diffusion through polymer coating |
| Application Methods | Basal application, top-dressing, or single-use fertilization |
| Suitable Crops | Corn, wheat, rice, cotton, oil palm, turfgrass, and ornamental plants |
Sulphur Coated Urea (60-90 days)
| Item | Standard Value | Description |
|---|---|---|
| Total Nitrogen (%) | ≥ 45.0 | Provides long-term nitrogen supply |
| Biuret (%) | ≤ 1.0 | Low biuret ensures crop safety |
| Moisture (%) | ≤ 0.5 | Stable for storage and transport |
| Granule Size (0.85–2.8 mm, %) | ≥ 90 | Uniform size suitable for mechanical spreading |
| 1-Day Nitrogen Release (%) | ≤ 15 | Avoids early nitrogen surge, reduces seedling burn |
| 7-Day Nitrogen Release (%) | 20–40 | Sustains early to mid-stage crop demand |
| Total Release Period (Days) | 60–90 | Covers full growth cycle with one application |
| Sulfur Coating Rate (%) | ≥ 30 | Ensures slow and consistent nitrogen release |
| Appearance | Yellow or light-yellow granules | Clean, smooth surface, no broken coating |
| Melting Point (°C) | ~132°C | Stable under hot storage conditions |
| Packaging | 25kg / 50kg woven bag | Standard for bulk distribution |
| Application | Basal or single-use fertilizer | Ideal for one-time application |
How to Apply Controlled-Release Urea
Soil Application: Apply evenly according to crop nitrogen requirements and recommended rates.
Pre-Plant Application: Use longer-release products to provide nitrogen during subsequent crop growth.
Side-Dressing: Apply during crop development when additional nitrogen is required.
Turf & Landscaping: Suitable for applications requiring a more gradual and consistent nitrogen supply.
Application rates and timing should be determined according to crop, soil, climate, and local agronomic recommendations.
Customer Reviews:
⭐⭐⭐⭐⭐ – “Risso Urea Fertilizer has significantly boosted my crop yield. My plants are healthier, greener, and growing faster than ever!” – Shilry D.
⭐⭐⭐⭐⭐ – “I’ve been using Risso Urea Fertilizer for my vegetables, and the results are outstanding—stronger plants, lush growth, and higher yields!” – Leon
Frequently Asked Questions
Controlled-release urea is a urea-based nitrogen fertilizer designed to release nitrogen gradually over a specific period.
Polymer-Coated Urea (PCU) is urea granules covered with a polymer coating that controls nitrogen release into the soil.
PCU is one type of controlled-release urea. Controlled-release urea is the broader category, while polymer-coated urea refers specifically to the coating technology.
Sulfur-Coated Urea (SCU) is urea covered with sulfur to slow nitrogen release. It also supplies sulfur to crops.
The release period depends on the coating, product design, temperature, moisture, and soil conditions. Risso can supply products with different release periods, including 60–90 days or longer.
Controlled-release urea can provide advantages where extended nitrogen availability, fewer applications, and improved nitrogen management are required. Product selection should be based on crop and local growing conditions.
Need a custom formula?
Contact our technical sales team for customized formulations, product specifications, samples, and bulk pricing.
How to Choose Controlled-Release Urea
Consider the following factors when selecting a product:
- Crop and growth period
- Required release duration
- Soil temperature and moisture
- Application method
- Coating technology
- Local climate and irrigation conditions
Risso can help customers select a suitable controlled-release urea based on crop requirements, application conditions, and target release period.
