Sec. 8503. (1) The guaranteed analysis shall show the minimum percentage of plant nutrients claimed in the following order and form:
(a) Total nitrogen (N).____%
Available phosphate (P2O5).____%
Soluble potash (K2O).____%
(b) When applied to mixed fertilizers, grade shall be given in whole numbers only. However, specialty fertilizers with a guarantee of less than 1% of total nitrogen,
available phosphate, and soluble potash may use fractional units. Fertilizer materials, bone meal, manures, and similar materials may be guaranteed
in fractional units.
(c) When applied to custom blends, grade can either be given in whole numbers or in
numbers expressed to the nearest 1/10 of a percent in the form of a decimal in the analysis.
(d) For unacidulated mineral phosphatic material and basic slag, bone, tankage, and
other organic phosphatic materials, the total phosphate or degree of fineness, or
both, may also be guaranteed.
(2) Additional plant nutrients, other than nitrogen, phosphorus, and potassium, claimed
to be present in any form or manner shall be guaranteed on the elemental basis, at
levels not less than those established by rules. Other beneficial compounds or substances, determinable by laboratory methods, may
be guaranteed if approved by the director.
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