No phosphatic fertilizer containing less than eighteen percent available phosphoric acid (P2O5), nor any nitrogen fertilizer containing less than fifteen percent total nitrogen (N), nor any potash fertilizer containing less than fifteen percent soluble potash (K2O), nor any mixed fertilizer in which the sum of the guaranteed analysis of total nitrogen (N), available phosphoric acid (P2O5), and soluble potash (K2O), totals less than twenty percent shall be offered for sale, sold, or distributed in this state. This section shall neither apply to specialty fertilizers as defined in section 200.3, subsection 23, nor to any fertilizer designed to be applied and ordinarily applied directly to growing plant foliage to stimulate further growth.
[C77, 79, 81, § 200.20]
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