Generic Materials Search: phosphate rock

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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
Nonsynthetic
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)
Phosphate Rock
Allowed
Crop Fertilizers and Soil Amendments
Nonsynthetic
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.