The budget director shall check all estimates submitted to see that all information required is included and may require any additional information from any department. He shall then submit all estimates to the governor, who may either himself or through the budget director call in any officer of any department to consider the estimates of such department and may order any further investigation of any item. The governor shall then prepare his tentative recommendations on each of the estimates and may hold such further conferences with any officer as he may wish. After the preparation of such recommendations they, or a summary thereof, shall be made public and a public hearing thereon may be held by the governor at which any person may appear and make suggestions as to any item or items or concerning the budget as a whole. After such hearing, the governor shall prepare his final budget for submission to the general assembly.