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OMRI Adds Anaerobic Digestion Categories

(September 5, 2013) OMRI recently added two new categories for fertilizing products made using anaerobic digestion. Products that use only plant material feedstocks will now be listed as Allowed under a new category on the OMRI Products List©. Products that use animal materials as feedstocks, including manure or animal by-products, will be listed in a new Allowed with Restrictions category, retaining the same “days to harvest” restriction as raw manure.

The recently printed 2013 OMRI Generic Materials List© does not reflect these changes. Please download the PDF supplement that includes all category updates here: Download 2013 Generic Materials List Supplement. Please also see the complete list of updated categories below.

Crop Materials

  • Anaerobic Digestate - plant and animal materials (CF)
  • Anaerobic Digestate - plant materials (CF)
  • Hydrogen Peroxide (CP)
  • Peracetic Acid (CP)
  • Peroxyacetic/Peracetic Acid (CAS #79-21-0) (CT)

Livestock Materials

  • Peroxyacetic/Peracetic Acid (CAS #79-21-0) (LT) (OMRI changed this annotation for clarification)

Processing Materials

  • Annatto Extract Color (PA)
  • Beta Carotene Color (PA)
  • Potassium Hydroxide (PN, PS)
  • Silicon Dioxide (PN)


OMRI Class Codes:

CF: Crop Fertilizers and Soil Amendments
CP: Crop Pest, Weed, and Disease Control
CT: Crop Management Tools and Production Aids

LF: Livestock Feed Ingredient
LH: Livestock Health Care
LP: Livestock External Parasiticides and Pesticides
LT: Livestock Management Tools and Production Aids

PA: Processing Agricultural Ingredients and Processing Aids
PN: Processing Nonagricultural Ingredients and Processing Aids
PP: Processing Pest Controls
PS: Processing Sanitizers and Cleaners
PC: Processing Containers and Packaging Materials