A farm's crop-specific acreage of wheat, feed grains, upland cotton, or rice eligible to enrol in commodity programmes under previous legislation, and subsequently eligible for production flexibility contracts under the FAIR Act of 1996. Base acreage equaled land planted for harvest to the crop, plus any land enrolled in Acreage Reduction Programs, plus land considered planted to the crop in zero, 50/85-92 or under permitted normal flex or optional flex acreage during a specified period of time. A farmer's crop acreage base was reduced by the portion of land placed in the Conservation Reserve programme (CRP), but increased by CRP base acreage leaving the CRP.