DEPARTMENT OF AGRICULTURE AND RURAL DEVELOPMENT
PESTICIDE AND PLANT PEST MANAGEMENT DIVISION
REGULATION NO. 634. COMMERCIAL FERTILIZERS
Filed with the secretary of state on March 7, 2022
These rules take effect 7 days after filing with the secretary of state.
By authority conferred on the director of the department of agriculture and rural
development by section 8516 of the natural resources and environmental protection act,
1994 PA 451, MCL 324.8516)
R 285.634.1, R 285.634. 3, and R 285.634.7 of the Michigan Administrative Code are
amended, and R 285.634.2 is rescinded, as follows:
R 285.634.1 Fertilizers for agricultural crop production; specialty fertilizers.
Rule 1. Plant nutrients in addition to nitrogen, phosphorus, and potassium when
mentioned in any form or manner must be guaranteed. Guarantees must be made on the
elemental basis. Sources of the elements guaranteed, and proof of availability must be
provided to the director upon request. Except guarantees for those water-soluble nutrients
labeled for hydroponic or continuous liquid feed programs, and guarantees for potting soils
and lawn soils, the minimum percentages that will be accepted for registration or licensing,
or both, are as follows:
R 285.634.2 Rescinded.
R 285.634.3 Placement of micronutrient guarantees on label.
October 13, 2021