Agricultural Research Advisory Board Improvement Act This bill amends the National Agricultural Research, Extension, and Teaching Policy Act of 1977 to extend and modify the National Agricultural Research, Extension, and Education, and Economics Advisory Board. The bill reduces the membership of the board from 25 to 15 members and modifies the membership categories. It also specifies that the duties of the board include making recommendations to the Secretary of Agriculture regarding agricultural research, extension, education, and economics programs.