Notice of such adjourned hearing, where additional land is to be included, and the purpose thereof shall be given by publication of notice at least once a week for two successive weeks in a newspaper of general circulation in the county in which the land, or the greater portion of the land, sought to be included is situated, or, in lieu of such publication, by service by registered mail upon the owner of such land as determined by the last equalized assessment roll in accordance with which such land was assessed.