The court shall direct the board of supervisors to issue bonds in lieu of the outstanding drainage bonds for said drainage district, and additional bonds for the accrued interest and other indebtedness of said drainage district. Said bonds shall be payable in amounts, and at the time and manner, and with priority of payments as has been determined by order of court, as provided by section 468.577, and shall be called “conservator’s drainage district bonds”. Each bond shall be numbered and shall state on its face that it is a conservator’s drainage district bond; that it is issued in pursuance of a resolution adopted by the board of supervisors, under order of court, and giving the name of the court and the county where such court is held; that it is issued to pay indebtedness of the drainage district; shall state the county where such district is located, and the number of the drainage district for which it is issued; shall state the date of maturity of the bond, the rate of interest thereon, which rate shall not exceed that permitted by chapter 74A, and that the bond is to be paid only from taxes assessed, levied and collected on the lands within the drainage district for which the bond is issued subject to the provisions of section 468.577. All bonds shall be signed by the chairperson of the board of supervisors and countersigned by the conservator designated as such. The interest coupons attached to said bonds shall be attested by the signature of the conservator or a facsimile thereof. When the bonds have been executed as herein required, the conservator may sell said bonds at not less than par with accrued interest thereon, and pay the indebtedness of said drainage district, or may exchange said bonds with the creditors of said drainage district in amounts as have been fixed and determined by the court, and the conservator shall cancel all drainage bonds, improvement certificates, warrants or other evidence of indebtedness received by the conservator in lieu of the conservator’s bonds.