traditionally underplanted acreage
(i)Subject to clause (ii), for the purposes of this paragraph the term “traditionally underplanted acreage” means the difference in a particular year between the acreage that is part of a producer’s crop acreage base that is not planted to the program crop and the part of the crop acreage base subject to an acreage limitation program or required to be set aside, but only to the extent that such number exceeds the number of acres resulting from the reduction in payment acres under an amendment made by section 1101 of the Omnibus Budget Reconciliation Act of 1990 (;). In no case shall such acreage be less than zero.