Prior to the adoption of a proposed master plan for the district or of any district land use ordinance or regulation, or amendment thereto, notice that the master plan or an ordinance or regulation, or amendment thereto, to be considered by the board shall be published at least once in a newspaper of general circulation in the county no less than two weeks prior to consideration by the board. The published notice shall state that a master plan for the district or an ordinance or regulation, or amendment thereto, will be considered by the board and that a copy of the proposed master plan or ordinance or regulation, or amendment thereto, is available for public inspection at the board office, or other location accessible to the public, which location shall be clearly published in the notice. The notice shall also state the time and the place and location where all persons may be heard in opposition to or in favor of the ordinance or regulation and shall clearly identify the district for which the proposed master plan or ordinance or regulation applies. The regulation, ordinance, or amendment thereto, shall not become effective until adoption by the board after a public hearing thereon, at which parties in interest and citizens shall have an opportunity to be heard. Following consideration of the proposed master plan, ordinance, or regulation, the board may adopt the proposed master plan, ordinance, or regulation, by majority vote of the members of the board. Unless otherwise provided by the board, an ordinance, regulation, or amendment thereto, adopted by the board shall become effective on the first day of the ninth month following adoption by the board. Any such action taken by the board may not be reconsidered without compliance with notice provisions as provided for in this part. The same, or substantially the same, matters may not be reconsidered for a period of 12 months.