On or before the sixth day of July of each year, the county manager of a county which has adopted any form of county managership shall prepare and submit to the board of county commissioners a budget presenting a financial plan for the conduct of the affairs of the county for the ensuing year. The budget shall be set up in the manner prescribed by general statute and shall be published prior to the date of its adoption by the board of county commissioners. Published notices and hearings shall be in accordance with the general statutes.