A Practical Look at Organic 10-10-10 Programs—And Why EDDHA Fe 6% Is the Missing Micronutrient

If you’re comparing options for 10 10 10 Fertilizer Organic programs, you’ve probably heard growers whisper about iron chlorosis and pH headaches. To be honest, that’s where EDDHA Fe 6% shines. Balanced NPK feeds the “bulk” appetite, but iron chelation keeps chlorophyll humming—especially in alkaline or calcareous soils where ordinary iron disappears faster than a coupon code on Black Friday.

Product Snapshot: EDDHA Fe 6% Organic Chelated Iron

Made in microgranular form in Shijiazhuang, Hebei (A-713, Zhengyang City Square), this chelate stays stable from pH 3 to 10—rare, and frankly, a relief. Many customers say it “rescued” citrus and blueberries where plain 10 10 10 Fertilizer Organic couldn’t close the chlorosis gap. It dissolves cleanly, so drip systems don’t plug, which is one less thing to worry about on a busy fertigation day.

Where it fits with organic 10-10-10

Pair your 10 10 10 Fertilizer Organic base (composted blends, fish + bone meal, etc.) with EDDHA Fe 6% when you see interveinal yellowing on young leaves, or when soil tests show high CaCO3 or pH > 7.5. It’s drip-, soil-drench-, and banding-friendly; foliar is possible, but staining can occur—your call.

Process flow (how it’s made, briefly)

• Materials: EDDHA ligand, ferrous salt, water; anti-caking agent (food/tech grade).
• Chelation: Controlled pH and temperature; monitored redox to keep Fe2+/Fe3+ balance right.
• Granulation: Spray-drying into micrograins to avoid plugging; then cooling.
• Sieving & packaging: Particle-size window tuned for fast dissolution.
• QC: Fe assay by ICP, o-o isomer by HPLC (EN 13368), moisture, bulk density.

Application guide (real-world ranges)

• Drip fertigation: 1–3 kg/ha per event; repeat every 2–4 weeks until green-up.
• Tree crops: 10–30 g/tree as soil drench near the dripline; heavy calcareous soils may need more.
• Greenhouse/berries: 0.5–1.5 g per plant per month; monitor leaf SPAD as a sanity check.

Compatibility: Generally fine with NPK solutions and most organics. Avoid mixing in highly concentrated acidic tanks; add last, circulate, and test a jar mix first (I always do).

Vendor snapshot (what buyers usually compare)

Real-world availability and paperwork vary—always request recent CoA, HPLC o-o data, and organic compliance letters.

Case notes (field feedback)

Vineyards, La Mancha: Drip applied 2 kg/ha EDDHA Fe 6% with an organic 10 10 10 Fertilizer Organic base. SPAD rose from 28→38 in 14 days; visible green-up, bunch weight up ≈7% (n=3 blocks). Greenhouse berries, Shandong: 1 g/plant monthly; leaf Fe (ICP) improved from 65→92 mg/kg DW.

Standards, testing, and service life

Follow EN 13368 for chelate profiling and ISO 8157 terms. Service life in soil is typically 4–8 weeks of effective availability (pH-dependent). Keep sealed; moisture can cake micrograins—annoying, but preventable.

Citations

1. EN 13368 (CEN): Fertilizers—Determination of chelating agents (EDDHA), HPLC methods.
2. ISO 8157:2015 Fertilizers and soil conditioners—Vocabulary.
3. AOAC Official Methods for metals by ICP—general guidance for Fe assay.
4. UC ANR: Iron chlorosis management in high-pH soils.
5. OMRI Standards Manual—Materials evaluation for organic production.