Zinc DTPA 7% uses DTPA (diethylene triamine pentaacetic acid) as the chelating agent, providing optimal zinc stability in the acidic-neutral pH range (5.5–7.5) where EDTA may be less effective. DTPA forms a more stable zinc complex than EDTA at lower pH values, making it the preferred zinc chelate for acidic soils, soilless growing systems and hydroponics.
DTPA chelation also provides superior stability against competing metal ions (particularly Fe³⁺ and Ca²⁺) at lower pH, ensuring zinc remains available as a discrete Zn-DTPA complex rather than undergoing ligand exchange. This is particularly important in high-phosphorus fertigated systems where Zn precipitation risk is high.
Zinc DTPA is the standard zinc source in European and US hydroponic and substrate growing systems. It is also used in acidic tea-growing soils (Northeast India) and acidic laterite soils of peninsular India.
| Zinc (Zn) as DTPA | 7.0% min |
| DTPA content | 30% |
| Water Solubility | Complete |
| pH stability | 5.5–7.5 (optimal) |
| Moisture | 0.3% max |
| Form | Off-white powder |
| Heavy Metals | <10 ppm |
| Drip Fertigation | 500g–1 kg per acre |
| Foliar Spray | 0.5 g per litre |
| Hydroponic Solution | 0.1–0.3 mg Zn/L in nutrient solution |
| Frequency | Weekly in fertigation programmes |
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