Polymer-coated controlled release fertilizers for sustained nutrition and reduced leaching. NPK 18-6-12, 15-9-12, and custom CRF formulations available in bulk.
Premium quality polymer-coated slow release fertilizer with 18% nitrogen, 6% P2O5, and 12% K2O. Advanced polymer membrane technology releases nutrients gradually over 3-6 months, synchronized with crop demand. Reduces nitrogen leaching losses by up to 70% and cuts application frequency from 3-4 times to once per season. Ideal for high-value crops, nurseries, turf, and environmentally sensitive areas.
| Total Nitrogen (N) | 18% |
| P2O5 | 6% |
| K2O | 12% |
| Release Period | 3-6 months |
| Coating Type | Polymer membrane |
| Appearance | Yellow / brown coated granular |
| Packaging | 25kg PP bags |
| MOQ | 1x20GP container (25T) |
| Parameter | Specification | Test Method |
|---|---|---|
| Total Nitrogen (N) | 18.0% min | ISO 5315 (Kjeldahl) |
| Controlled Release N | 12.0% min (67% of total N) | ISO 18644 (Water incubation) |
| P2O5 | 6.0% min | ISO 6598 (Spectrophotometry) |
| K2O | 12.0% min | ISO 5318 (Flame Photometry) |
| Release Period | 3-6 months (at 25℃) | ISO 18644 |
| Release Rate (28 days) | 30-45% of total nutrients | ISO 18644 |
| Polymer Coating Content | 3-5% | Gravimetric |
| Moisture | 2.0% max | ISO 760 |
| Particle Size (2-4mm) | 90% min | ISO 8397 |
| Crushing Strength | 25N min | ISO 8337 |
| Appearance | Yellow / brown coated granular | Visual |
| Shelf Life | 24 months (sealed, dry storage) | - |
Polymer membrane technology releases nutrients gradually over 3-6 months, matching crop demand curves and eliminating feast-or-famine nutrient cycles.
Controlled release reduces nitrogen leaching by up to 70% compared to conventional fertilizers, protecting groundwater and reducing environmental impact.
One application at planting provides nutrition for the entire crop cycle, reducing labor, fuel, and equipment costs from 3-4 applications to one.
Release rate increases with soil temperature, naturally accelerating during warm growing periods and slowing during cool dormant periods.
Polymer coating prevents high salt concentration around roots, eliminating seedling burn and allowing safe placement near seeds and transplants.
Manufactured to ISO 9001 standards with SGS pre-shipment inspection. Full COA with release curve data provided with every shipment.
SRF polymer-coated fertilizer is ideal for high-value crops, nurseries, turf, ornamentals, and environmentally sensitive areas where single-application convenience and reduced losses are priorities.
Vegetables, strawberry, melon, tobacco. Apply 300-600 kg/HA as single basal application at planting.
Golf courses, sports fields, landscaping turf. 150-300 kg/HA for 3-4 month sustained green-up.
Container plants, potted ornamentals, seedlings. Mix 2-4 g/L into potting substrate for season-long nutrition.
| Crop Stage | Application Rate | Method |
|---|---|---|
| Field crops (basal) | 300-600 kg/HA | Soil incorporation 5-10cm deep at planting |
| Turf | 150-300 kg/HA | Broadcast and water in; do not core-aerate for 2 weeks |
| Container / potting mix | 2-4 g per liter of substrate | Mix uniformly into growing medium before planting |
We offer full OEM customization for slow release fertilizer products. Whether you need a specific NPK ratio, release period, coating thickness, or private-label branding, our technical team can deliver to your exact specifications.
Available in 18-6-12, 15-9-12, 20-5-10, 16-8-12, and custom ratios for specific crop and climate requirements.
Available in 1-month, 3-month, 6-month, 9-month, and 12-month release durations by adjusting polymer coating thickness.
Sulfur-coated urea (SCU) and polymer-coated urea (PCU) for pure nitrogen slow release up to 90 days.
Your logo, design, and multilingual labels on bags. Full private-label service with custom artwork.
Woven PP bag with inner PE liner. Moisture-proof. 1,000 bags per 20GP (25T).
Moisture-proof bag for retail and nursery distribution. Pallet-loaded for export.
Retail-ready foil pouch for consumer and lawn care market. Custom sizes available.
Custom bag sizes, branding, and labeling. Minimum 25T for custom packaging.
| Container Type | Bag Size | Bags/Container | Total Tonnage |
|---|---|---|---|
| 20GP | 25kg | 1,000 bags | 25 tons |
| 20GP | 10kg | 2,500 bags | 25 tons |
| 20GP | 5kg | 5,000 bags | 25 tons |
| 40HQ | 25kg | 2,000 bags | 50 tons |
Fill out the form below to receive a detailed quotation within 24 hours. Include your target quantity, destination port, and any customization requirements.
