After such petition has been approved in writing by the chief engineer, the board of directors of the irrigation district shall cause a notice of the filing of such petition to be given and published in the same manner and for the same time as notices for hearing on petition for organization of original irrigation district are required by section 1* of this act. The notice shall state the filing of such petition, a general description of lands mentioned in said petition, and the prayers of the petition. The notice shall be directed to all persons concerned without specifically naming said persons. The notice shall inform such persons concerned to appear in the office of the directors of the irrigation district at a time stated therein, and show cause, in writing, if any they have, why the change in the boundaries of the district as proposed in the petition should not be made.