200.20  Phosphoric acid, nitrogen, and potash requirements.
  1.  Except as provided in subsection 2, a person shall not sell, offer for sale, or distribute any of the following:
  a.  Phosphatic fertilizer containing less than eighteen percent available phosphoric acid (P2O5).
  b.  Nitrogen fertilizer containing less than fifteen percent total nitrogen (N).
  c.  Potash fertilizer containing less than fifteen percent soluble potash (K2O).
  d.  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.
  2.  Subsection 1 shall not apply to any of the following:
  a.  A specialty fertilizer.
  b.  A fertilizer designed to be applied and ordinarily applied directly to growing plant foliage to stimulate further growth.
  c.  Compost materials to be applied on land, if any of the following apply:
  (1)  The land is being used to produce an agricultural commodity that is an organic agricultural product as provided in chapter 190C, including rules adopted by the department under that chapter.
  (2)  The land is in the transition of being used to produce an agricultural commodity that is an organic agricultural product, pursuant to rules adopted by the department as provided in chapter 190C.
[C77, 79, 81, §200.20]
2000 Acts, ch 1082, §2