N.C. Gen. Stat. § 106-557
With respect to any referendum conducted under the provisions of this Article, the duly certified commission, council, board or other agency shall, before calling and announcing such referendum, fix, determine and publicly announce at least 30 days before the date determined upon for such referendum, the date, hours and polling places for voting in such referendum, the amount and basis of the assessment proposed to be collected, the means by which such assessment shall be collected if authorized by the growers, and the general purposes to which said amount so collected shall be applied; no annual assessment levied under the provisions of this Article shall exceed one half of one percent ( 1/2; of 1%) of the value of the year's production of such agricultural commodity grown by any farmer, producer or grower included in the group to which such referendum is submitted. Provided, that the assessment for the research and promotion programs of the American Dairy Association of North Carolina may be fixed on the volume of milk sold not to exceed one percent (1%) of the statewide blend price paid to all North Carolina producers during the previous calendar year for three and one-half percent (3.5%) milk as computed by the United States Department of Agriculture. Provided further, that the assessment authorized by this Article and collected by the Commissioner of Agriculture to be paid to the North Carolina Yam Commission, Inc., or other duly certified agencies entitled thereto for research, marketing and promotional programs related to yams or sweet potatoes may be levied at a rate not to exceed two percent (2%) of the value of the year's production of that agricultural commodity grown by any farmer, producer or grower included in the group to which the referendum is submitted, and when authorized by two-thirds or more of the farmers, producers or growers in the area in which the referendum is conducted, the rate of the assessment may remain in effect for the length of time provided in the referendum. Provided further, that the assessment authorized by this Article on peanuts may not exceed two percent (2%) of the price paid to the producer.
N.C. Gen. Stat. § 106-557