Section, act Oct. 31, 1949, ch. 792, title I, § 113, as added Dec. 3, 1980, Pub. L. 96–494, title II, § 207, 94 Stat. 2572; amended Dec. 22, 1981, Pub. L. 97–98, title XI, § 1105, 95 Stat. 1264; Dec. 23, 1985, Pub. L. 99–198, title X, § 1011, 99 Stat. 1454; Nov. 28, 1990, Pub. L. 101–624, title XI, § 1125, 104 Stat. 3506, authorized Secretary to announce and provide for supplemental set-aside and acreage limitation program.