During each marketing season and not later than July 1st, the commissioner shall estimate a budget that includes contributions and assessments necessary for the administration and enforcement of this order and for carrying on duly authorized programs and activities including marketing, product research and informational services as hereinbefore provided. The commissioner shall announce upon recommendation of the advisory board, a rate of assessment not to exceed $4 per acre to defray expenditures under this program. The rate of assessment shall remain in effect for the duration of the program unless changed by the commissioner. The total amount of budgeted administrative cost shall not exceed five percent of the total budget.