The provisions of this chapter, except as necessary to conduct an implementation referendum vote, shall not become operative until the director finds, in a referendum conducted by the director, that at least 40 percent of the total number of producers from the list established by the director pursuant to Section 72091, participate, and either of the following:
(a) Sixty-five percent or more of the producers who voted in the referendum, and the producers so voting marketed a majority or more of the total quantity of wheat in the preceding season by all of the producers who voted in the referendum, voted in favor of the provisions of this chapter.
(b) A majority or more of the producers who voted in the referendum, and the producers so voting marketed 65 percent or more of the total quantity of wheat in the preceding season by all of the producers who voted in the referendum, voted in favor of the provisions of this chapter.