13 (1) Every mixed fertilizer containing two or more major plant nutrients shall have a combined nutrient level, determined on the basis of an analysis of that fertilizer made by an analyst, equal to or greater than the combined nutrient level determined from the guaranteed analysis shown on the label of that fertilizer when each combined nutrient level is computed in accordance with subsection (2).
(2) Each combined nutrient level shall be determined by adding the amount of total nitrogen multiplied by 2.5, the amount of available phosphoric acid multiplied by 2.0 and the amount of soluble potash.
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