Mich. Admin. Code R. 285.634.6 - Soil conditioners
Rule 6. A registration shall not be issued for a product that represents itself by label or supplemental material, leaflets, or advertising to improve the physical nature of the soil by altering the soil structure, by making soil nutrients more available, or otherwise enhancing the soil media resulting in beneficial crop response, unless the manufacturer or distributor of the product can provide scientifically acceptable data from experimentation which give reasonable assurance that such benefits as claimed can be expected to occur and are of definitive benefit to plant growth.
Notes
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