Diammonium Phosphate (DAP) 18-46-0 Supply
Product: Diammonium Phosphate (DAP)
Chemical formula: (NH₄)₂HPO₄
Standard grade: 18-46-0
Diammonium Phosphate (DAP) Overview
Diammonium phosphate (DAP) is described on this page as one of the most widely used high-analysis phosphate fertilizers in global agriculture. It supplies nitrogen (N) and phosphorus (P₂O₅) in a highly concentrated, water-soluble form. DAP is produced by the controlled reaction of ammonia (NH₃) with phosphoric acid (H₃PO₄), followed by granulation, drying and screening.
When applied to soil, DAP rapidly dissolves and releases ammonium (NH₄⁺) and phosphate (H₂PO₄⁻ / HPO₄²⁻) ions. It is valued as a basal / starter fertilizer because of its dual nutrient supply and handling properties. Standard grade on this page is 18-46-0.
Diammonium Phosphate (DAP) Technical Specifications
Technical Specifications
| Parameter | Unit | Fertilizer Grade (Standard) | Industry / Technical Grade |
|---|---|---|---|
| Purity | % | — | 99 min |
| Total Nutrient (N + P₂O₅) | % | 64 min | 74 min |
| Total Nitrogen (N) | % | 18 min | 21 min |
| Phosphorus Pentoxide (P₂O₅) | % | 46 min | 53 min |
| Moisture | % | 2.5 max | 0.2 max |
| Water Insoluble | % | 0.1 max | 0.1 max |
| pH (1% solution) | — | 7.8 – 8.2 | 7.8 – 8.2 |
| Particle Size (1–4 mm) | % | 90 min | — |
| Arsenic (As) | ppm | 20 max | 10 max |
| Cadmium (Cd) | ppm | 7 max | 0.5 max |
| Mercury (Hg) | ppm | 0.1 max | 0.1 max |
| Selenium (Se) | ppm | 1 max | 0.1 max |
| Lead (Pb) | ppm | 10 max | 0.001 max |
| Appearance | — | Brown granular | White crystalline powder |
Key Benefits
- High nutrient concentration
- — 18% N + 46% P₂O₅ in every granule reduces transport and application costs.
- Immediate nutrient availability
- — Highly water-soluble; both nitrogen and phosphorus become plant-available soon after application.
- Ammoniacal nitrogen
- — Resists leaching compared to nitrate forms and supports early vegetative growth.
- Starter fertilizer advantage
- — Excellent for placement near the seed or transplant to promote strong root development.
- Compatible with most blending operations
- — Widely used as a base material in NPK compound fertilizers.
- Alkaline reaction zone
- — Creates a temporary higher pH around the granule, which can improve phosphorus availability in acidic soils.
Recommended Applications
- DAP is suitable for a wide range of crops and farming systems:
- Cereals & Field Crops
- Wheat, maize/corn, barley, rice, sugarcane, sugar beet
- Oilseeds & Pulses
- Sunflower, soybean, groundnut, pulses
- Vegetables
- Potato, tomato, onion, cucumber, chilli, leafy vegetables
- Fruit & Plantation Crops
- Apple, pear, citrus, mango, pistachio, banana, oil palm
- Other Uses
- Basal dressing before sowing or transplanting
- Starter fertilizer in precision placement systems
- Component in bulk blends and NPK compounds
- Limited use in fertigation after proper dissolution
- Typical Application Rates
- (guide only — actual rates depend on soil test, crop, and region): 100–250 kg/ha as basal dose for most field crops.
Packing and Shipping
- 50 kg polypropylene bags (most common for retail and medium-scale use)
- 500 kg / 1,000 kg jumbo bags (FIBC)
- Bulk (loose) for large industrial and commercial farms
Storage and Handling
- Store in a cool, dry, well-ventilated warehouse protected from moisture and direct sunlight.
- Keep bags sealed and stacked on pallets to prevent caking.
- Avoid contact with alkaline materials.
- Use appropriate personal protective equipment during handling (dust mask, gloves).
Why Ametheus
- Fertilizer-grade and industry/technical-grade values, packing and storage notes are those already published on this page.
- No origin or payment term was added.
Related pages: Rock Phosphate | Muriate of Potash (MOP).
FAQ
What standard grade is stated?
18-46-0.
Does the table include more than one grade?
Yes. The published table has columns for fertilizer grade (standard) and industry / technical grade.
What packing is listed?
50 kg polypropylene bags; 500 kg / 1,000 kg jumbo bags (FIBC); and bulk (loose) for large industrial and commercial farms.
Inquiry
For current availability, grade, quantity and delivery window, please include:
- Grade or form, and any specification limits you require
- Quantity and packing
- Destination and preferred delivery window
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