; and (B) the Secretary determines that the remainder of the field is infeasible to farm. . (c) Planting status of certain land Section 1231(c) of the Food Security Act of 1985 ( 16 U.S.C. 3831(c) ) is amended to read as follows: (c) Planting status of certain land (1) In general For purposes of determining the eligibility of land to be enrolled in the conservation reserve established under this subchapter, land shall be considered to be planted to an agricultural commodity during a crop year if, during the crop year, the land was devoted to a conserving use. (2) Multi-year grasses and legumes (A) In general For purposes of this subchapter, alfalfa and other multi-year grasses and legumes in a rotation practice, approved by the Secretary, shall be considered agricultural commodities. (B) Cropping history Alfalfa, when grown as part of a rotation practice, as determined by the Secretary, is an agricultural commodity subject to the cropping history criteria under subsection (b)(1)(B) for the purpose of determining whether eligible cropland has been planted or considered planted for 4 of the 6 years referred to in such subsection. . (d) Enrollment Section 1231(d) of the Food Security Act of 1985 ( 16 U.S.C. 3831(d) ) is amended to read as follows: (d) Enrollment (1) Enrollment options The Secretary shall offer enrollment in the conservation reserve under this subchapter through the following enrollment options: (A) A general enrollment option, for eligible land described in subsection (b)(1). (B) A continuous enrollment option, for eligible land described in subsection (b)(2) and any associated eligible land described in subsection (b)(5). (C) A grassland enrollment option, for eligible land described in subsection (b)(3). (D) A partnership initiatives enrollment option, for eligible land described in subsection (b)(4), and any associated eligible land described in subsection (b)(5), that is to be enrolled pursuant to an agreement entered into under section 1231A(b). (2) Method of enrollment (A) General enrollment