Why It Matters
Growers on calcareous, high-pH soils search for o,o-EDDHA iron to correct lime-induced chlorosis, because EDTA and DTPA chelates dissociate and lose iron above pH 7. The EDDHA ligand holds Fe(III) stable up to about pH 9-11, keeping iron plant-available where weaker chelates fail
Solution Approach
Growers on calcareous, high-pH soils search for o,o-EDDHA iron to correct lime-induced chlorosis, because EDTA and DTPA chelates dissociate and lose iron above pH 7. The EDDHA ligand holds Fe(III) stable up to about pH 9-11, keeping iron plant-available where weaker chelates fail RawSource supplies the base chemicals that go into these programs. We can help with product selection, grade matching, and sourcing from multiple origins for supply security.
Typical Application Workflow
1
Application & Agronomic Review
Define the use (crop input, adjuvant, soil amendment, post-harvest) and the agronomic, regulatory, and tank-mix requirements.
2
Input & Grade Selection
Match the surfactant or adjuvant, nutrient source, chelate, or formulation aid to the active, water quality, and label.
3
Compatibility & Rate Trial
Confirm tank-mix compatibility, dose, and stability, and size packaging (jugs, drums, totes, bulk) to the season and logistics.
4
Field Validation
Validate efficacy and crop safety in field trials, and lock the spec and supply plan for the season.
Recommended Chemistries (5)
o,o-EDDHA Fe chelate (6%)
CAS 16455-61-1
Aromatic phenolic chelator that keeps Fe(III) soluble and plant-available up to ~pH 9-11, the only common iron chelate stable on calcareous soils
Full Details
EDDHSA Fe chelate
Sulfonated EDDHA analogue offering high-pH iron stability with greater water solubility for fertigation
Full Details
EDDHMA Fe chelate
Methylated EDDHA iron chelate giving comparable high-pH stability for correcting lime-induced chlorosis
Full Details
Tetrasodium EDTA (EDTA Na4)
CAS 64-02-8
Amines & Amides
Chelant
Lower-cost chelate for neutral-to-acidic soils and tank sequestration of hardness ions, but releases iron above pH 6.5-7 (already in catalog, contrast product)
Melting Point: 300 °C (decomposes) Density: 6.9 lb/gal /Apparent density/ Solubility: Slightly soluble in ethanol
Full Details
DTPA (Diethylenetriaminepentaacetic Acid)
CAS 67-43-6
Amines & Amides
Chelation / Sequestration
Mid-range chelate stable to roughly pH 7.5; bridges between EDTA and EDDHA for moderately alkaline soils
Physical Description: White to off-white solid Boiling Point: Decomposes Melting Point: 219-220 ºC
Full Details