Notwithstanding any authorization for appropriations for agricultural research in any Act enacted prior to September 29, 1977, there are hereby authorized to be appropriated for the purposes of carrying out the provisions of this chapter, except sections 3152,^[1] and 2669 of this title, and the competitive grants program provided for in section 1414,^[2] and except that the authorization for moneys provided under the Act of March 2, 1887 (24 Stat. 440–442, as amended; 7 U.S.C. 361a–361i), is excluded and is provided for in subsection (b) of this section, such sums as may be necessary for each of fiscal years 1991 through 2023.