The board shall report to the governor and the legislature such facts, observations, and conclusions respecting each of the institutions under its control as in the judgment of the board should be considered by the legislature. Such report shall contain an itemized account of the receipts and expenditures of the board, and also the reports made to the board by the executive officers of the several institutions or a summary thereof, and shall submit budgets for biennial appropriations deemed necessary and proper to be made for the support of the several institutions and for the extraordinary and special expenditures for buildings, betterments, and other improvements.