Slow Release DAP (Diammonium Phosphate) is a controlled release phosphorus fertilizer developed for modern agriculture. Manufactured by Shandong AOLANSU Environmental Protection Technology Co., Ltd., our Slow Release DAP uses advanced gelatin/PVA composite coating technology to achieve a controlled nutrient release period of 30-120 days. It helps reduce nutrient loss, improve fertilizer utilization efficiency, and provide a stable nutrient supply for crops.
Compared with conventional DAP fertilizer, which dissolves rapidly after application, coated Slow Release DAP gradually releases nitrogen and phosphorus according to soil moisture conditions and crop growth requirements. It is widely used in rice, wheat, corn, vegetables, fruit trees and large-scale farming applications.
Our Slow Release DAP adopts gelatin/PVA composite coating technology to create a semi-permeable protective layer around each fertilizer granule. Soil moisture enters through microscopic pores, allowing nutrients to dissolve and release gradually. With an adjustable release period of 30 to 120 days, the fertilizer supply better matches crop growth cycles and reduces the frequency of top-dressing applications.
The product contains ≥64% total nutrients, including ≥18% nitrogen and ≥46% phosphorus pentoxide (P₂O₅). The coating structure helps reduce nutrient loss caused by excessive dissolution, leaching and fixation, allowing crops to absorb nutrients more efficiently and helping farmers optimize fertilizer input costs.
With uniform granule size, low moisture content and good flowability, Slow Release DAP is suitable for mechanical spreading, broadcasting and furrow application. It can be used for various crops including rice, wheat, corn, vegetables, fruit trees and other commercial crops.
Shandong AOLANSU Environmental Protection Technology Co., Ltd. is a professional fertilizer manufacturer and supplier located in China. Our factory specializes in the production of specialty fertilizers and coated fertilizer products for global agricultural markets.
With dedicated production equipment and strict quality inspection procedures, we control every stage from raw material selection and coating processing to finished product packaging, ensuring stable quality and reliable performance for bulk fertilizer buyers.
AOLANSU Slow Release DAP is produced using specialized fertilizer processing equipment and controlled coating technology:
High-quality phosphoric acid and ammonia are selected as the main raw materials to ensure stable nutrient content and fertilizer performance.
A biodegradable gelatin/PVA composite coating is applied evenly to fertilizer granules. The coating thickness can be adjusted according to different crop requirements and release periods, helping achieve stable nutrient release.
Each production batch is inspected for nutrient content, moisture, particle size and coating performance before shipment to ensure consistent product quality.
To ensure reliable fertilizer performance, AOLANSU implements a complete quality control system covering raw materials, production processes and finished products. Each batch of Slow Release DAP undergoes professional inspection before delivery.
We analyze nitrogen and phosphorus content to ensure that each batch meets the required fertilizer specifications and maintains stable nutrient performance.
The coating layer is inspected for uniformity and integrity to ensure consistent controlled-release performance during crop cultivation.
Particle size, moisture content, hardness and flowability are tested to ensure the fertilizer is suitable for storage, transportation and mechanized agricultural application.
Slow Release DAP has been applied in different agricultural regions where farmers require longer nutrient availability and reduced fertilizer application frequency.
In Southeast Asian rice-growing areas, Slow Release DAP was tested as a basal fertilizer application. Compared with conventional fertilization methods requiring multiple top-dressing operations, the controlled-release fertilizer provided a more stable nutrient supply throughout crop growth.
The application results showed improved nutrient availability during important growth stages, reduced labor requirements and better fertilizer management efficiency. Actual results may vary depending on soil conditions, climate and cultivation methods.
| Product Name | Slow Release DAP (Diammonium Phosphate) |
| CAS No. | 7783-28-0 |
| Molecular Formula | (NH₄)₂HPO₄ |
| Appearance | White/light gray coated granular fertilizer, 2-4mm |
| Total Nutrient (N+P₂O₅) | ≥64% |
| Total Nitrogen (N) | ≥18% |
| Available Phosphorus (P₂O₅) | ≥46% |
| Water-Soluble Phosphorus | ≥90% |
| Moisture Content | ≤2.0% |
| pH Value | 7.5-8.5 |
| Release Period | 30-120 days (adjustable) |
| Coating Material | Gelatin/PVA composite biodegradable coating |
| Package | 50kg PP woven bag with PE inner lining, bulk packaging available |
| Storage Condition | Dry, ventilated and cool warehouse, protected from moisture |
A1: The main difference is the nutrient release speed. Conventional DAP dissolves quickly after application, which may result in nutrient loss through leaching or fixation. Slow Release DAP uses gelatin/PVA coating technology to control nutrient release over 30-120 days, providing a more stable nitrogen and phosphorus supply for crops.
A2: Slow Release DAP is suitable for a wide range of crops, including rice, wheat, corn, vegetables, fruit trees and other commercial crops. It is especially suitable for large-scale farming operations where reducing fertilizer application frequency and improving nutrient management efficiency are important.
A3: Shandong AOLANSU Environmental Protection Technology Co., Ltd. is a professional fertilizer manufacturer with its own production facility in China. We provide controlled release fertilizer solutions with stable quality, factory-direct supply, export support and customized service for global agricultural distributors and farming companies.
A4: Slow Release DAP should be stored in a dry, ventilated and cool warehouse away from moisture and incompatible materials. Proper storage helps maintain granule quality and ensures stable fertilizer performance during application.
A5: The coating layer slows down fertilizer dissolution and reduces nutrient loss caused by excessive release, rainfall or irrigation. This allows crops to absorb nitrogen and phosphorus over a longer period and improves overall fertilizer management efficiency.
A6: Slow Release DAP can replace conventional DAP in many agricultural applications. However, the recommended application method depends on crop type, soil condition, climate and local farming practices.
AOLANSU supports trial orders and bulk procurement requirements. We provide flexible supply solutions for agricultural distributors, fertilizer wholesalers and large farming projects.
We provide necessary export documents including MSDS, COA and Certificate of Origin to support smooth international shipment and customs clearance.
Our agricultural team provides product guidance and customized fertilizer recommendations according to different crops, soil conditions and application requirements.
With professional international logistics partners, we support sea transportation and other shipping solutions to ensure stable delivery for overseas customers.
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(North of Dongwei Group, West) Houwei Village, Changshan Town, Zouping City, Binzhou, Shandong Province, China
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