After the hearing, findings shall be made and procedures followed which are in accordance with the applicable provisions of Article 5 (commencing with Section 59641) of this chapter. If the findings are positive, a marketing program is issued, and a proration zone with new boundaries is established, the marketing program shall be submitted to producers within the zone for their written assent as prescribed by the applicable provisions and procedures of Article 9 (commencing with Section 59851) of this chapter.