Generic Materials Search: iron, products

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View the OMRI Generic Materials List Glossary in PDF format here.
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Ferric and Ferrous Compounds
Allowed with Restrictions
Crop Fertilizers and Soil Amendments, Crop Pest, Weed, and Disease Control
Synthetic
Includes ferric oxide, ferric sulfate, and ferrous sulfate. See also IRON PRODUCTS and MICRONUTRIENTS – SYNTHETIC listings.
205.601(j)(6)(ii)
Ferric and Ferrous Compounds
Prohibited
Crop Fertilizers and Soil Amendments, Crop Pest, Weed, and Disease Control
Synthetic
Includes ferrous phosphates, ferric chloride, and ferrous ammonium sulfate. See also IRON PRODUCTS and MICRONUTRIENTS – SYNTHETIC listings.
205.105(a)
Iron Products
Allowed with Restrictions
Crop Fertilizers and Soil Amendments
Synthetic
Ferric oxide, ferric sulfate, ferrous sulfate, iron citrate, iron sulfate, or iron tartrate may be used to correct documented deficiencies of iron. See MICRONUTRIENTS – SYNTHETIC listings.
205.601(j)(6)(ii) Micronutrients—not to be used as a defoliant, herbicide, or desiccant. Those made from nitrates or chlorides are not allowed. Soil deficiency must be documented by testing. (ii) sulfates, carbonates, oxides, or silicates of zinc, copper, iron, manganese, molybdenum, selenium, and cobalt.
Iron Products
Prohibited
Crop Fertilizers and Soil Amendments, Crop Pest, Weed, and Disease Control
Synthetic
Includes ferrous ammonium sulfate, ferric chloride, and iron nitrate. See MICRONUTRIENTS – SYNTHETIC listings.
205.105(a) & 205.601(j)(6)(ii) Iron products that contain chloride or nitrate are prohibited.
Iron Sulfates
Allowed with Restrictions
Crop Fertilizers and Soil Amendments
Synthetic
See IRON PRODUCTS.
205.601(j)(6)(ii)
Micronutrients – synthetic
Allowed with Restrictions
Crop Fertilizers and Soil Amendments
Synthetic
Use restricted to cases where soil/plant nutrient deficiency is documented by soil or tissue testing. Micronutrients include: boron, cobalt, copper, iron, manganese, molybdenum, selenium, and zinc. Carriers, fillers, chelating agents, and complexing agents must either be nonsynthetic, or must be on the list of allowed synthetics. See other MICRONUTRIENTS – SYNTHETIC listings, and TRACE MINERALS – NONSYNTHETIC.
205.601(j)(6) As plant or soil amendments… Micronutrients—not to be used as a defoliant, herbicide, or desiccant. Those made from nitrates or chlorides are not allowed. Soil deficiency must be documented by testing. (i) Soluble boron products (ii) Sulfates, carbonates, oxides, or silicates of zinc, copper, iron, manganese, molybdenum, selenium, and cobalt.
Sulfate of Iron
Allowed with Restrictions
Crop Fertilizers and Soil Amendments
Nonsynthetic
See also IRON PRODUCTS.
205.601(j)(6)(ii)