Di-Ammonium Phosphate (DAP)
Basic Information:
Chemical Formula: (NH4)2HPO4
Formula Weight: 132.06 g/mol
Water solubility(20 ºC): 588 g/L
Solution pH (1 g/100 mL): 7.5 to 8
HS CODE: 3105300090
Place of Origin: China
Product Description:
Diammonium phosphate (DAP) is globally recognized as the predominant phosphorus (P) fertilizer, holding the distinction of being extensively applied worldwide. Derived from two prevalent constituents within the fertilizer industry, DAP enjoys widespread popularity due to its notable nutrient richness and its exceptional physical characteristics.
Guaranteed Specifications: GB/T 10205-2009
| Specifications | Granular DAP(18-46-0) | ||
|---|---|---|---|
| Appearance | Granule | Pb | 0.0050%max |
| Total Nutrients (N+P2O5) | 64.0%min | As | 0.0050%max |
| Total Nitrogen | 18.0%min | Cd | 0.0010%max |
| Soluble P2O5 Content | 46.0%min | Cr | 0.0050%max |
| Moisture (H2O) | 2.5%max | Hg | 0.0005%max |
| Particle Size(1-4mm) | 90%min | ||
| pH(1 g/100 mL) | 7.5~8 |
Production：
Ammonium phosphate fertilizers were introduced in the 1960s, with Diammonium phosphate (DAP) quickly gaining prominence as the most sought-after product within this category. DAP is manufactured through a precisely controlled reaction between phosphoric acid and ammonia, followed by subsequent steps of cooling, granulation, and sieving. DAP exhibits exceptional handling and storage characteristics. The standardized DAP grade is recognized as 18-46-0, and fertilizers with lower nutrient content are deemed ineligible for DAP labeling.
To produce one ton of DAP fertilizer, approximately 1.5 to 2 tons of phosphate rock, 0.4 tons of sulfur (S) for rock dissolution, and 0.2 tons of ammonia are required. Any alterations in the supply or pricing of these inputs will have a direct impact on DAP prices and availability. The elevated nutrient content of DAP plays a pivotal role in mitigating handling, freight, and application costs. DAP is manufactured across numerous global locations and enjoys extensive trade as a commoditized fertilizer product.
Management Practices:
Although different commercial phosphorus (P) fertilizers exhibit variances in their initial chemical reactions within soil, these disparities diminish in significance over time, typically within weeks or months. From the perspective of plant nutrition, the impact of these dissimilarities is minimal. Extensive field comparisons between Diammonium phosphate (DAP) and Monoammonium phosphate (MAP) consistently reveal only negligible or non-existent distinctions in plant growth and yield resulting from the choice of P source, provided that appropriate management practices are implemented.
Applications*:
· Agricultural Use
Diammonium phosphate (DAP) fertilizer serves as an exceptional source of phosphorus (P) and nitrogen (N) for optimal plant nutrition. Its exceptional solubility facilitates rapid dissolution in soil, releasing plant-accessible phosphate and ammonium. A notable characteristic of DAP is the development of an alkaline pH surrounding the dissolving granule.
The release of ammonium from dissolving DAP granules can pose a risk to seedlings and plant roots in close proximity due to the potential volatility of ammonia. This potential harm is more prevalent in soil with a pH greater than 7, a condition frequently observed near the dissolving DAP granule. To mitigate the possibility of seedling damage, caution should be exercised to avoid placing concentrated amounts of DAP near germinating seeds.
The ammonium present in DAP acts as an excellent nitrogen source, gradually undergoing conversion to nitrate through soil bacteria activity, resulting in a subsequent decline in soil pH. As a result, the initial increase in soil pH surrounding DAP granules is a temporary phenomenon. This initial pH rise in the vicinity of DAP can influence the micro-site reactions involving phosphate and soil organic matter.
· Non-agricultural Uses
DAP finds utility in various applications as a fire retardant. For instance, a mixture of DAP and other constituents can be strategically deployed to prevent forest fires. DAP subsequently serves as a nutrient source once the fire hazard subsides. In addition, DAP is employed in diverse industrial processes, such as metal finishing. It is commonly added to wine to sustain yeast fermentation and to cheese to support cheese cultures.
*Source: Nutrient Source Specifics (No. 17), International Plant Nutrition Institute.
Packaging:
The issue of fertilizer caking has been successfully resolved through meticulous enhancements made to the packaging, focusing on parameters such as the thickness of inner bags, the tightness of bags, and the loading capacity of outer bags.
Our commitment to meeting the diverse requirements of our esteemed clientele is evidenced by our ability to provide a wide array of customized packaging solutions. Depending on the specific needs of our customers, we offer the following packaging options:
– Laminated woven bags weighing either 25 kg or 50 kg
– Bulk bags with capacities of 500 kg, 600 kg, 1000 kg, or 1200 kg
– PE valve bags or PE heated sealed bags, available in weights of 20 kg or 25 kg
– For optimal convenience and flexibility, shipments can be arranged in loose form, amounts ranging from 20 to 27 metric tons, or secured on pallets within containers.
