Upon adoption of the plan, the board shall appoint three appraisers of the qualifications prescribed in section 468.24, who shall qualify in the manner provided in that section, and shall fix a time for hearing on their report of which all interested parties shall take notice. The appraisers shall view the premises and fix and determine the damages to which each claimant is entitled, including claimants whose awards for damages were canceled by the order of adoption. The appraisers shall place a separate valuation upon the acreage of each owner taken for right-of-way or other purposes necessitated by adoption of the plan and shall file a report in writing in the office of the auditor at least five days before the date fixed by the board for hearing on the report. If the report will not be filed on time or if good cause for delay exists, the board may postpone the time for final action on the subject and, if necessary, may appoint other appraisers. Thereafter the provisions of section 468.26 shall apply.