A city may certify taxes to be levied by the county on all taxable property within the city limits, for all city government purposes. However, the tax levied by a city on tracts of land and improvements thereon used and assessed for agricultural or horticultural purposes, shall not exceed three dollars and three-eighths cents per thousand dollars of assessed value in any year. Improvements located on such tracts of land and not used for agricultural or horticultural purposes and all residential dwellings are subject to the same rate of tax levied by the city on all other taxable property within the city. A city’s tax levy for the general fund shall not exceed eight dollars and ten cents per thousand dollars of taxable value in any tax year, except for the levies authorized in section 384.12.