Appointment of appraisers.) The court may appoint 1, 2 or 3 disinterested appraisers, who, after taking an oath fairly to appraise the property, shall go upon the premises, make an appraisal, and report to the court in writing the result of the appraisal. The court shall fix a reasonable sum for the services of the appraisers, which, with the expenses of the appraisal, shall be allowed as costs. When the property lies in more than one county the court may appoint appraisers for the tracts in each county. If an appraisal is made, the sale may not be made for a sum less than 2/3 of the appraised value of the property to be sold, but each tract need not bring 2/3 of its appraised value if the total sum received for all tracts equals 2/3 of the appraised value of all tracts.