A person may not sell or offer for sale for agronomic purposes any leather, hair, wool waste, hoof, horn, urea-formaldehyde condensation products or similar materials, either singly or in combination, unless the products or materials have been processed in such manner as to make the plant food content available in conformity with the standards established by the State Department of Agriculture, taking into consideration the standards of activity recommended by recognized experts in the field. [2001 c.914 §9]
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