N.C. Gen. Stat. § 106-568.5

If in such referendum more than one third of the farmers and producers eligible to participate therein and voting therein shall vote in the negative and against the levying or collection of such assessment, then in such event no assessment shall be levied or collected, but if two thirds or more of such farmers and producers voting therein shall vote in the affirmative and in favor of the levying or collection of such assessment, then such assessment shall be collected in the manner hereinafter provided.