A.M.S.U.S.D.A.gov :The United States Department of Agriculture (USDA) National Organic Program (NOP) has defined 18 biochar as “a biomass that has been carbonized or charred” and classified it as a non-synthetic substance 19 via guidance from NOP 5034-1 (NOP 2016a).
NOPBiochar Technical Report Marc 2021
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