By July 1, 1983, the commissioner shall establish specific timber appraisal standards according to which all timber appraisals will be conducted under this chapter. The standards shall include a specification of the maximum allowable appraisal sampling error, and the procedures for tree defect allowance, tract area estimation, product volume estimation, and product value determination. The timber appraisal standards shall be included in each edition of the timber sales manual published by the commissioner. In addition to the duties pursuant to section 90.061, every state appraiser shall work within the guidelines of the timber appraisal standards. The standards shall not be subject to the rulemaking provisions of chapter 14.