Down To Earth Fertilizers and Organic Soil Improvers utilize high quality material inputs that meet or exceed the standards set forth by the USDA National Organic Program (NOP), and that are approved for use in organic crop production. Most of our products are currently listed on the OMRI Products List or CDFA Organic Input Materials List. Please note the “OMRI” and CDFA ”OIM" logos throughout the catalog that identify which products have been reviewed to determine that they are NOP compliant