In the United States, the American Society of Agronomy is the regulatory organization responsible for certification. The American Society of Agronomy uses a sliding scale of education and experience to determine certification - it is required to have either a bachelor's degree in science and 5 years work experience, a master's degree related to agrology and 3 years work experience, or a Doctorate related to agrology and a single year of work experience. CPAgs are required to complete at least 50 hours of continuing education through the American Society of Agronomy every two years in order to retain their certification.