For the purpose of raising reasonable and necessary funds for producer participation in the operations of the agency set up under farmer sponsorship for the promotion of flue-cured tobacco, it is proper, desirable, necessary and in the public interest that the farmers in this State engaged in the production of flue-cured tobacco shall have the opportunity and privilege of participating in a referendum to be held as in this chapter provided, in which there shall be determined the question of whether or not the farmers of the State engaged in the production of flue-cured tobacco shall levy upon themselves an annual assessment for the purposes herein stated.