Section 001-350-7 - SLOWLY RELEASED PLANT NUTRIENTS1. No fertilizer label shall bear a statement indicating that certain plant nutrients contained in a fertilizer are released slowly over a period of time, unless the slow release components are identified and guaranteed at a level of at least 15% of the total guaranteed for that nutrient(s).2. Products with recognized slow release properties include:A. Water insoluble products, such as natural organics, ureaform materials, urea-formaldehyde products, isobutylidene diurea, and oxamide;B. Coated slow release products, such as sulfur coated urea and other encapsulated soluble fertilizers;C. Occluded slow release products, where fertilizers or fertilizer materials are mixed with waxes, resins, or other materials and formed into particles; andD. Products containing water soluble nitrogen such as ureaform materials, urea-formaldehyde products, methylenediurea (MDU), dimethylenetriurea (DMTU), dicyanodiamide (DCD). The terms, "water insoluble", "coated slow release", "slowly available water soluble", and "occluded slow release" are accepted as descriptive of these products, provided the manufacturer can show a testing program substantiating the claim.3. Until more appropriate methods are developed, AOAC International Method 970.04 (15th Edition) shall be used to confirm the coated slow release and occluded slow release nutrients and others whose slow release characteristics depend on particle size. AOAC International Method 945.01 (15th Edition) shall be used to determine the water insoluble nitrogen or organic materials01-001 C.M.R. ch. 350, § 7