Notwithstanding any other provision of this Constitution, the legislature may hereafter, by general law, provide for the promotion of the production, distribution, marketing and use of poultry and poultry products. The legislature may provide for the promotion of poultry and poultry products and the poultry industry by research, education, advertising and other methods, and the legislature is further authorized to provide means and methods for the financing of any such promotional activity by prescribing a procedure whereby producers, owners or growers of poultry may by referendum held among such producers, owners or growers of poultry in this state levy upon themselves and collect assessments, fees, or charges upon the sale of poultry and poultry products for the financing of any such promotional program or activity in cooperation with processors, dealers, handlers and other buyers of poultry and poultry products. Provided, no assessment levied hereunder shall exceed two and one-half cents (2 1/2 ¢) per hen or other domesticated fowl or any other classes of poultry sold by producers thereof. The legislature is authorized to make provisions for nonpayment and for the refund of assessments levied upon owners, producers or growers of poultry to any such person who does not desire to participate in the promotional program. The legislature shall provide for the collection and distribution of assessments or charges authorized hereunder and to provide penalties for failure to make such collection and distribution of assessments. The legislature shall provide for the designation of a nonprofit association or organization organized for the promotion and betterment of poultry and poultry products in Alabama to administer and carry out such promotional program which shall include conducting elections or referendum among producers, owners or growers of poultry. The legislature shall further provide for the deposit, withdrawal, disbursement and expenditure by the designated association of any funds received subject to the supervision and control of the activities authorized herein by the department of agriculture and industries and the state board of agriculture and industries. Assessments, fees or other charges collected as authorized by any legislative act adopted under authority hereof shall not be considered as a tax within the meaning of this Constitution or any provision thereof. Any uniformity requirements of this Constitution shall be satisfied by the application of the program upon poultry and poultry products.