Sec. 68.  ASSESSMENTS ON PRODUCT SALES BY ASSOCIATIONS OF AGRICULTURAL PRODUCERS.  The legislature may provide for the advancement of food and fiber in this state by providing representative associations of agricultural producers with authority to collect such refundable assessments on their product sales as may be approved by referenda of producers.  All revenue collected shall be used solely to finance programs of marketing, promotion, research, and education relating to that commodity.  
(Added Nov. 8, 1983.)