If, within thirty days after the filing of any condemnation commissioners’ report under the provisions of section 523.040, the condemnor shall have neither paid the amount of the commissioners’ award to the persons named in the petition as owning or claiming any property or rights or to the clerk of the court for such named persons nor timely filed its written election to abandon the proposed appropriation of said property or rights, then interest on the amount of any subsequent verdict for said named persons, or if there be no such verdict, then on the amount of the award, at the rate of six percent per annum from the date of filing the report shall be added to said verdict or award and paid to said named person or to the clerk for them. If, within thirty days after the filing of any such commissioners’ report the condemnor shall have paid the amount of any commissioners’ award to the persons named in the petition as owning or claiming any property or rights or to the clerk of the court for them and the amount of such award shall be superseded by a subsequent verdict or amount larger than the award paid, then interest on the amount by which such verdict exceeds the award, at the rate of six percent per annum from the date of filing the report, shall be added to the amount of the verdict; but if the amount of the award shall be superseded by a subsequent verdict or amount smaller than the award paid, then judgment shall be entered against said persons named to repay to condemnor the amount by which the award paid exceeds the amount of the verdict, with six percent interest on such excess payment from the date of the payment of the award. If, within thirty days after the filing of any such commissioners’ report, the condemnor shall have neither paid the amount of the award to said persons or to the clerk for them nor filed its written election to abandon the appropriation, but shall thereafter timely file such written election to abandon, then the court may, upon motion filed by said persons within ten days after the filing of said election, assess against the condemnor six percent interest on the amount of the award from the date of the filing of the commissioners’ report to the date of the filing of such election, enter judgment thereon and enforce payment thereof by execution or other appropriate proceeding.