A county board may manage the county funds and county business, except as otherwise specifically provided. A county board may invest any trust fund, subject to its control and not otherwise restricted by law, in bonds or other interest bearing obligations of the United States maturing or subject to redemption at such time as shall not adversely affect the proper administration of the trust. Interest from any such investment shall accrue to the fund and shall, except to the extent otherwise provided by law or court order, become the property of the county upon disbursement of the fund.