On any administrative hearing, those who favor or support a marketing order shall be called the “petitioners.” Those who oppose or who do not favor an order shall be called “respondents.”The presiding officer shall be designated by the commissioner and shall be known as the “hearing master.” He shall have complete control of the hearing. Parties may be represented by attorney and the practice established by section 34 of the Agriculture and Markets Law shall be followed. A written record of proceedings shall be made and proof of publication of the notice of hearing shall be filed as part of the hearing record. After the close of the hearing, the hearing master shall refer the proceeding to the commissioner with his written recommendation.