SM Fe EDDHA 6%
| FUNCTIONS: | Iron deficiency correction – Alkaline-soil performance – Chlorophyll formation – Season-long availability – Soil and fertigation feeding |
| FOR: | Fruit, citrus, vines, vegetables, and ornamentals on calcareous or high-pH soils, applied to the soil or through fertigation |
| SOURCE: | Synthetic |
| APPEARANCE: | Free-flowing micro-granules |
| COLOR: | Dark red to reddish-brown |
| PACKAGING: | 25 Kg |
SPECIFICATION |
W/W |
|---|---|
| CAS Number | 16455-61-1 |
| Chemical name | Sodium ferric ethylenediamine-N,N'-bis(2-hydroxyphenylacetate) (sodium ferric EDDHA) |
| Chemical formula | C18H16FeN2NaO6 |
| Molecular weight | 435.17 g/mol |
| Iron (Fe) | 6% |
| Chelated form | 100% chelated by EDDHA |
| Available grades (o,o Fe) | 5.3% o,o | 4.8% o,o, | 3.2% o,o | (higher o,o = greater stability and availability) |
| pH Stability Range | 3 - 12 |
| Solubility (water, 20 °C) | 60 g/L |
Description
SM Fe EDDHA 6% delivers iron in an EDDHA chelate that stays stable in exactly the conditions where most iron sources fail: alkaline, calcareous, and bicarbonate-rich soils. On these soils iron is rapidly oxidised and locked into insoluble hydroxides, and weaker chelates such as EDTA release their iron once the pH climbs above roughly seven. EDDHA holds iron through a far wider window, keeping the 6% iron content available to the root across strongly alkaline conditions. The product is offered in three ortho-ortho (o,o) isomer grades, 5.3%, 4.8%, and 3.2% o,o, the fraction that governs how much of the iron is truly stable, so a higher o,o figure is the higher-availability grade and the choice for the most difficult soils.
Key Benefits
- Keeps iron available on high-pH soils. The EDDHA chelate stays intact up to around pH 11, far above the point where EDTA-iron breaks down, so iron remains soluble and root-available on calcareous and bicarbonate soils where chlorosis is otherwise chronic.
- Restores chlorophyll and photosynthesis. Iron is essential to chlorophyll biosynthesis and to the cytochromes and oxidative enzymes of respiration and photosynthesis, so correcting a shortfall returns green colour and growth to chlorotic new leaves.
- Delivers a defined, available iron fraction. With EDDHA the share of iron held in the ortho-ortho isomer sets how much actually stays stable and available in the soil, so the effective iron is a known, repeatable quantity rather than a total-iron figure that can overstate what reaches the crop.
- Corrects long-season chlorosis from a soil application. Because the chelate resists breakdown, soil-applied iron stays available to perennial and high-value crops through the season rather than precipitating soon after application.
- Dissolves cleanly for soil and fertigation use. The micro-granules dissolve fully for accurate soil drenching and trouble-free injection through fertigation lines.
How It Works
Iron chlorosis on alkaline and calcareous soils is a solubility problem. Above about pH 7, ferric iron precipitates as insoluble hydroxides and oxyhydroxides, and the carbonate and bicarbonate that buffer these soils keep pushing iron out of solution faster than the root can absorb it. A chelate protects iron by wrapping it in a stable ring, but not every chelate holds under these conditions: EDTA loses its iron once high pH and competing calcium displace the metal. EDDHA, built around two phenolic groups, forms a much stronger complex with ferric iron that survives the full agronomic pH range, up to roughly pH 11.
In SM Fe EDDHA 6%, the iron is carried in this alkaline-stable chelate, and the share held in the ortho-ortho isomer is the part that stays genuinely available in the soil. The ortho-ortho configuration forms a six-coordinate complex that resists displacement, which is why grades are specified by their o,o percentage rather than by total iron alone: two products can both read 6% iron yet differ in how much of that iron actually reaches the crop. Applied to the soil or through fertigation, the chelate maintains a reservoir of available iron around the roots, correcting established chlorosis and preventing its return through the season.
When to Use SM Fe EDDHA 6%
Use where soil pH, free lime, or bicarbonate make iron chronically unavailable and EDTA grades cannot hold.
- SM Fe EDDHA 6% suits perennial fruit, citrus, and vines on calcareous soils, applied to the root zone before or at the onset of spring growth.
- It fits vegetable and ornamental crops on high-pH soils as a corrective soil or fertigation treatment when interveinal chlorosis appears on young leaves.
- It integrates into fertigation programmes as a stable iron source where irrigation water is hard or alkaline.
EDDHA earns its premium specifically on alkaline and calcareous ground; on neutral to acidic soils an EDTA-iron grade corrects iron at lower cost, so match the chelate to the soil pH.
Three ortho-ortho grades are available so the product can be matched to the problem: the 5.3% o,o grade for strongly calcareous, high-pH soils and severe or persistent chlorosis; the 4.8% o,o grade for moderately calcareous soils; and the 3.2% o,o grade for mildly alkaline soils and preventive maintenance.
Confirm compatibility with a small-scale jar test before combining with other inputs in the same tank.
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