Finding Bulk Iron Sulfate in Fargo, ND: Sources and Alternatives

Iron Chlorosis Treatment: Where to Get 50-lb Bags of Iron Sulfate

Local suppliers in Fargo don't stock bulk iron sulfate. Here are mail-order and regional sources:

Direct Sources

• Ironite (4.5% Fe) – widely available at farm stores, but low concentration.
• Ferrous sulfate 20.5% – order from Ironite.com or agricultural co-ops (often sold as "copperas").
• Acidified mining residue (Iron-Sul, 20% Fe) – check with regional fertilizer distributors.

Chelated Iron Alternatives (Higher Cost, Better in High pH)

Address the Root Cause: Soil pH

Iron chlorosis in Fargo usually stems from alkaline soil (pH > 7). Elemental sulfur (90% S) lowers pH permanently:

• Apply 5–10 lbs per 100 sq ft, incorporate, retest in 6 months.
• Degra-Sul or Agri-Sul (prilled sulfur) easier to spread than powder.

Trunk Injection (For Large Oaks)

If soil treatment fails, certified arborists can inject ferric ammonium citrate directly into the vascular system – immediate green-up, lasts 2–3 years.

Start with a soil test (NDSU Extension). Correcting pH is cheaper and longer-lasting than repeated iron applications.