If in any referendum held under the provisions of this article two thirds or more of the egg producers in the area in which the referendum is conducted, eligible to participate and voting therein, shall vote in the affirmative and in favor of the levying and collection of the assessment proposed in such referendum, then such assessment shall be levied and collected in the manner provided in this article. Two thirds or more of the eligible voters who actually vote in the referendum shall be the number required for the levying of assessments for a promotional program as authorized under this article. Following the referendum and within 10 days thereafter, the certified association shall canvass, tabulate and publicly declare and announce the results thereof. The amount of the assessment levied under this article shall not exceed the amount authorized to be assessed for promotion of poultry and poultry products as set out in the Constitution of Alabama 1901.