Control authorities, independently or in combination, may purchase or provide for needed or necessary equipment for the control of weeds, whether or not declared noxious, on land under their jurisdiction and may make available the use of machinery and other equipment and operators at such cost as may be deemed sufficient to cover the actual cost of operations, including depreciation, of such machinery and equipment. All funds so received shall be deposited to the noxious weed control fund or, if no noxious weed control fund exists, to the county general fund. Each control authority shall keep a record showing the procurement and rental of equipment, which record shall be open to inspection by citizens of this state.