Why Ammonium Dihydrogen Phosphate Is Essential for Modern Agriculture and Industry
Technical Introduction
Ammonium Dihydrogen Phosphate (ADP), chemical formula NH₄H₂PO₄, is a highly water-soluble fertilizer and industrial chemical.
It provides two key nutrients—nitrogen (N) in the ammonium form and phosphorus (P₂O₅) in a fully available form.
Thanks to its low salt index, chloride-free composition, and slightly acidic reaction in solution, ADP is widely used in agriculture, horticulture, and several industrial applications.
Applications
1. Agriculture & Horticulture
Base Fertilizer: Improves soil nutrient availability.
Seedling & Transplanting Stages: Encourages root and shoot growth.
Foliar Feeding: Rapidly corrects nitrogen and phosphorus deficiencies.
Fertigation: Ideal for drip irrigation and sprinkler systems due to its full solubility.
Hydroponics: Ensures clean nutrient supply without precipitation issues.
2. Industrial Uses
Fire Retardants: Component in fireproofing agents and firefighting powders.
Optical Materials: Applied in the manufacture of nonlinear optical crystals.
Textiles & Paper: Used for flameproof treatments.
Advantages
Dual Nutrient Supply: Provides N and P together in readily usable form.
High Solubility: 100% dissolves in water for efficient plant uptake.
Chlorine-Free: Safe for sensitive crops like tobacco, fruits, and vegetables.
Low Salt Index: Reduces risk of leaf burn and soil salinization.
pH Adjusting: Slightly acidic, improving nutrient absorption in alkaline soils.
Typical Parameters
| Property | Value |
|---|---|
| Chemical Formula | NH₄H₂PO₄ |
| Nitrogen (N) | 11–12% |
| Phosphorus (P₂O₅) | 60–61% |
| Appearance | White crystalline powder |
| Solubility in Water | 100% soluble |
| pH (1% solution) | 4.2–4.8 |
| Purity | ≥ 98% |
| Shelf Life | 24 months in dry, sealed storage |
FAQs
Q1: Why is ADP preferred over other phosphorus fertilizers?
A1: Because it supplies both N and P in one product, is chloride-free, and has a low salt index.
Q2: Can ADP be applied as a foliar spray?
A2: Yes, typically in 0.3–1% concentration for quick correction of nutrient deficiencies.
Q3: Is ADP compatible with other fertilizers?
A3: Yes, except with calcium- and magnesium-rich solutions where precipitation may occur.
Q4: Is it suitable for hydroponics?
A4: Absolutely, its high solubility and purity make it ideal for hydroponic systems.
Q5: How should ADP be stored?
A5: Store in a cool, dry, ventilated place, away from moisture and direct sunlight.
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