A person who is paid to apply fertilizer to turf not used for agricultural purposes may not apply fertilizer containing nitrogen or phosphorus to turf unless that person is a certified professional fertilizer applicator, or working under the direct supervision of a professional fertilizer applicator. A person, other than a certified professional fertilizer applicator, a trained employee, or a person who merely markets services for a certified professional fertilizer applicator, may not offer to provide turf fertilization services for compensation. Each business location, agency, golf course, or other location shall employ a certified professional fertilizer applicator when an employee is paid to fertilize.