Generic Materials Search: phosphate, rock

4 results


4 items found.

View the OMRI Generic Materials List Glossary in PDF format here.
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Calcium – nonsynthetic
Allowed with Restrictions
Livestock Feed Ingredients, Livestock Health Care
May be supplied by: calcite, chalk, rock, ground clam shells, gypsiferous shale, ground limestone, dolomitic limestone, oyster shell flour, ground phosphate rock, soft phosphate rock, or shell flour. May not be fed in amounts above those needed for adequate nutrition and health maintenance for the species at its specific stage in life.
205.237(a) & 205.237(b)(2)
Gypsum By-products
Crop Fertilizers and Soil Amendments
Gypsum produced as a by-product of superphosphate manufacture (the reaction of rock phosphate and sulfuric acid), from precipitation of sulfur dioxide gas with limestone, or from dry-wall rejects is prohibited.
Phosphate Rock
Crop Fertilizers and Soil Amendments
Must not be fortified or processed with synthetic chemicals. Includes colloidal phosphate rock. See also MINED MINERALS – UNPROCESSED.
205.203(d)(2) A mined substance of low solubility.
Phosphorous – nonsynthetic
Livestock Feed Ingredients, Livestock Health Care
Sources include ground rock phosphate, low fluorine rock phosphate, and soft rock phosphate. See also MINERALS listings.
205.237(a), 205.237(b)(2) & 205.603(d)(2)