What is an OMRI Category?
An OMRI Category, or Listing, is a general category of materials used in organic crop production, food processing, and livestock production. The specific categories used by OMRI are published as the OMRI Generic Materials List, and are contained within the OMRI Standards Manual. Each product listed in the OMRI Products List must have a category listing. When applying for a product to be listed by OMRI, choose the one material listing that best fits your product.