Where to buy amendments

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These minerals should be available at your local farm supply store:

  • Ag Lime
  • Dolomite Lime
  • Gypsum
  • Rock Phosphate
  • Bone Meal
  • Magnesium Sulfate (Epsom Salts) Small quantities are at the drug store in the laxative aisle.
  • Potassium Sulfate
  • Sul-Po-Mag (K-Mag or Langbienite)
  • Ag Sulfur
  • Feather Meal (may be listed as a feed, or available at the feed store instead)
  • Soybean Meal (may be listed as a feed, or available at the feed store instead)
  • Kelp

If you have a small area you may be able to find smaller quantities at your local garden supply store. These amendments may also be found online at Peaceful Valley Farm Supply.

The sulfates are available online from Alpha Chemicals. These include:

  • Iron Sulfate
  • Manganese Sulfate
  • Zinc Sulfate

From the grocery store in the laundry products aisle:

  • Borax

Source for BioMin copper:

Source for Phosphoric acid stabilized fish hydrolysate (approximately 2-4-0)

Other sources for amendments are listed on the Soil Analyst Cooperative website.


Using different amendments than the ones OrganiCalc recommends?

Click here to calculate the correct amounts using our Amendment Converter


Please be sure to read our General Recommendations. It’s full of timely and pithy information critical to success!