Chemical name: Diethylenetriamine Penta Acetic Acid, Ferric–sodium complex
Cas No: 12389-75-2
EINECS Number: 235-627-0
Molecular Formula: C14H20FeN3O10
Molecular weight:468.2
Specification
| Items | Standard |
| Appearance | Brown- Yellow powder |
| Fe chelated | 10.5% min |
| pH value (1% solution) | 2.5-3.5 |
| 5% Solution | Transparent liquid |
| Insoluble matters in water | 0.05% max |
Packing: 25kg bag/drum, customized packing is available.
Usage:
DTPA Fe (Diethylenetriamine Pentaacetic Acid Iron) is a chelated iron fertilizer effective in soils with pH up to 7.0. It is widely used as a corrective treatment for iron deficiency (iron chlorosis) — a common problem in high-pH or calcareous soils that causes interveinal yellowing in young leaves.
Agricultural uses:
- Drip irrigation and fertigation for vegetables, strawberries, and leafy greens
- Hydroponic and aquaponic systems where iron stability in solution is critical
- Foliar spray for rapid correction of iron chlorosis symptoms
- Aquariums and ornamental water gardens (maintains dissolved iron for aquatic plants)
Comparison with other chelated iron sources: DTPA Fe is effective up to pH 7.0 — more stable than EDTA Fe (effective to pH 6.5), but less stable than EDDHA Fe (effective to pH 11). For neutral to slightly alkaline soils (pH 6.0–7.0), DTPA Fe offers a good balance between performance and cost. For high-pH calcareous soils above pH 7.5, EDDHA Fe is recommended.
Application rates: 1–5 kg/ha via drip irrigation; 0.5–1 g/L for foliar spray. Avoid mixing with high-phosphate solutions to prevent precipitation.
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Key Advantages over EDTA Fe
DTPA Fe offers superior performance in calcareous and alkaline soils compared to EDTA Fe. While EDTA Fe becomes unstable above pH 7.0 and releases iron that precipitates as iron oxide, DTPA Fe maintains chelation stability up to pH 7.5, making it the recommended choice for Mediterranean soils, irrigated arid-zone agriculture, and high-carbonate growing media used in hydroponics. Typical foliar application rates range from 2–5 kg/ha, while fertigation rates of 3–8 kg/ha per season are common for perennial crops. DTPA Fe is widely used in citrus, avocado, stone fruits, wine grapes, and greenhouse vegetables where lime-induced iron chlorosis is a recurring challenge. In pH 7–7.5 soils, DTPA Fe provides 2–3× longer residual availability than EDTA Fe before iron is precipitated. For soils above pH 7.5, EDDHA Fe is the most stable option.
Further reading: EDDHA Fe vs EDTA Fe: Chelated Iron Comparison Guide