The County Executive shall appoint an Agricultural Preservation Advisory Board in accordance with the provisions of the Agricultural Article, Title 2, Subtitle 5, Annotated Code of Maryland. There shall be five members, at least three of whom shall be owner-operators of commercial farms who earn fifty percent (50%) or more of their income from farming. The term of office for each member shall be five years. No member shall serve more than two consecutive full terms. Appointments to fill a vacancy shall be for the remainder of the unexpired term. The terms of the initial appointments shall be staggered with one member appointed to a three-year term, two members appointed to four-year terms, and two members appointed to five-year terms. The Board members shall elect annually from their own membership a chairman and such other officers as it deems necessary. The duties of the Board shall be as provided in State law.