respect to the acreage added to the farm under this subsection or a prorated payment under the conservation reserve contract, but not both. (b) Prevention of Excess Base Acres (1) Required reduction If the sum of the base acres for a farm and the acreage described in paragraph (2) exceeds the actual cropland acreage of the farm, the Secretary shall reduce the base acres for 1 or more covered commodities for the farm so that the sum of the base acres and the acreage described in paragraph (2) does not exceed the actual cropland acreage of the farm. (2) Other acreage For purposes of paragraph (1), the Secretary shall include the following: (A) Any acreage on the farm enrolled in the conservation reserve program or wetlands reserve program (or successor programs) under title XII of the Food Security Act of 1985 ( 16 U.S.C. 3801 et seq.). (B) Any other acreage on the farm enrolled in a Federal conservation program for which payments are made in exchange for not producing an agricultural commodity on the acreage. (C) If the Secretary designates additional oilseeds, any eligible oilseed acreage, which shall be determined in the same manner as eligible oilseed acreage under subsection (a)(1)(C). (3) Selection of acres The Secretary shall give the owner of the farm the opportunity to select the base acres for a covered commodity for the farm against which the reduction required by paragraph (1) will be made. (4) Exception for double-cropped acreage In applying paragraph (1), the Secretary shall make an exception in the case of double cropping, as determined by the Secretary. (c) Reduction in Base Acres (1) Reduction at option of owner (A) In general The owner of a farm may reduce, at any time, the base acres for any covered commodity for the farm. (B) Effect of reduction A reduction under subparagraph (A) shall be permanent and made in a manner prescribed by the Secretary. (2) Required action by Secretary (A) In general The Secretary shall proportionately reduce base acres on a farm for land that has been subdivided and