No marketing program or major amendment shall be effective unless the secretary finds through referendum:
Volume shall be determined on the basis of the quantity of the commodity produced in the next preceding marketing season in New Jersey or that area of New Jersey to be covered by the marketing program or amendment. To facilitate the conduct of the referendum and to delineate those producers subject to the provisions of this act, the secretary or advisory council may limit eligibility for voting in and application of the referendum to those producers who produced a reasonable minimum amount, as determined by the secretary or council, of the affected commodity during the year immediately preceding the year in which the referendum is held and who are producing such commodity during the year of the referendum.
Nonprofit associations of producers who have the written consent of members to vote for them in referenda concerned with marketing programs may cast a bloc vote for such members in any referendum provided for in this act.
N.J.S. § 4:10-55