Rule 3. Only the guarantees or claims for the plant nutrients listed in R 285.634.1 will
be accepted. Proposed labels and directions for the use of the fertilizer must be furnished
with the application for license or registration, or both, upon request. Any of the elements
listed in R 285.634.1 that are guaranteed must appear in the order listed and must
immediately follow guarantees for the primary nutrients of nitrogen, phosphorus, and
potassium, if present.
History: 1979 AC; 2022 MR 5, Eff. Mar. 14, 2022.
R 285.634.4 Slowly available plant nutrients.
Rule 4. (1) A fertilizer label shall not bear a statement that connotes or implies the
presence of a slowly available plant nutrient, unless the nutrient is identified.
(2) When a fertilizer label implies or connotes that the nitrogen is slowly available
through the use of words such as "organic," "organic nitrogen," "ureaform," "long
lasting," or similar terms, the guaranteed analysis shall indicate the percentage of water
insoluble nitrogen. This
requirement shall not apply to manipulated animal and composted vegetable materials
distributed as such and not mixed with other materials. The label shall not bear a
reference to slowly available nitrogen when water insoluble nitrogen is less than 15% of
the total nitrogen.
(3) The term "coated--slow release" may be accepted as descriptive of products and
shall be allowed on labeling when the manufacturer can provide acceptable data
substantiating the claim.
History: 1979 AC.
R 285.634.5 Specialty fertilizer labeling format.
Rule 5. The following information, if not appearing on the face or display side of a
container in a readable and conspicuous form, shall occupy at least the upper third of a
side of the container and shall be considered the label:
(a) Net weight.
(b) Brand name and grade.
(c) Guaranteed analysis:
Total nitrogen (N)
___________% Ammoniacal nitrogen (if claimed)
___________% Nitrate nitrogen (if claimed)
___________% Water insoluble nitrogen (required when
terms described in R 285.634.4 are used)
Available phosphoric acid (P205)
Soluble potash (K20)
Additional plant nutrients
(d) Sources of nutrients when shown.
(e) Potential acidity or basicity in terms of calcium carbonate equivalent per ton (if
(f) Name and address of the registrant.