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Organic Growers Supply Volume Discounts
5% over $200
10% over $400
15% over $800
20% over $1600
over $2500 bulk pricing
Humic Acids SP
Humic Acids SP A dry soluble powder with humic acid concentration of 85%. Derived from the mineral leonardite. Humic acids are the wild-card molecules of soil physics and chemistry, performing complex functions by way of several different electrical and chemical reactions. Both powerful chelators and bind-all stabilizers, humic acids can prevent leaching of trace minerals into subsoil and increase uptake rate of micronutrients. They neutralize soil pH and reduce the toxicity of heavy metals. With a water-holding capacity of 7 times their volume, they contribute greatly to soil structure and indirectly buffer soil temperature. They stimulate growth of foliage and roots significantly. Humic acids also have the ability to retain soil carbon for more than 1000 years, especially in conjunction with farming practices that prevent their decomposition, such as minimal or no tillage, cover cropping and mulching. These same practices increase the microbial populations responsible for new humus formation and cycling.

Best used as a foliar feed in combination with Fulvic Acid, the other soluble component of humus. Can also be applied directly to roots or in the soil before seeding or planting.

For direct soil applications, use 2–10#/acre. For irrigation, use 2–10#/acre with a concentration of 1 oz/50 gal water. For foliar feed, use 3–6 oz/acre at the same concentration as prescribed for irrigation, every 4 to 6 weeks. For adding into an actively aerated compost-tea brew as fungal “food,” use 2½ oz/25 gal of tea. Caution: Higher than recommended concentrations of humic substances in soil can be inhibitive to proper plant growth. Don’t overdo it! MOFGA NEW!

Item Discounted
8161A: (1#) $9.00
8161B: (55#) $325.00 ($308.75)
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Additional Information

Organic Certification

Inoculants, soil amendments, fertilizers, livestock supplies and pesticides are labeled as:
OMRI: Organic Materials Review Institute. Most state certifying agencies, including MOFGA, accept OMRI approval.
MOFGA: Maine Organic Farmers & Gardeners Association. Reviewed by MOFGA and allowed for use on MOFGA-certified farms. Check with your certifier.
WSDA: The Washington State Department of Agriculture’s Organic Certifying division has approved these products for use in organic agriculture in Washington State. MOFGA has indicated that they will accept products on this list for their certification program. Check with your certifier.
Nat’l List: One-ingredient products on the NOP* List of Allowed Substances (subpart G of the Organic Foods Production Act, sections 205.601-606). Check with your certifier.
AYC: Products whose active ingredient is on the list of allowed substances, but which are not on the OMRI or WSDA list. Ask your certifier.
Not Allowed: A few of the products we list are not allowed for organic production but we think they have a place in sensible agriculture and can be used when certification is not an issue.

• Click here for our list of soil amendments, fertilizers, and disease and insect controls along with their certification status and manufacturers.

Support MOFGA

MOFGA leads the way in growing Maine’s agricultural community. We at Fedco committed ourselves to raising at least $50,000 for MOFGA over five years. You can help in this effort, with easy actions on the check-out page.
  • Add a donation to MOFGA with your order. Add any amount in the donation box.
  • Donate any refund to MOFGA, and we will match your donation. Just click your choice of dollar limit.
  • Let us know you are a MOFGA member, and we will make a donation equal to 1% of your order total.