The constitutional amendment authorizing the legislature to permit the voters of a municipality having a population of less than 10,000 to authorize the governing body of the municipality to enter into an agreement with an owner of real property in or adjacent to an area in the municipality that has been approved for funding under certain programs administered by the Texas Department of Agriculture under which the parties agree that all ad valorem taxes imposed on the owner's property may not be increased for the first five tax years after the tax year in which the agreement is entered into.