Notwithstanding the provisions of title I of the Agricultural Act of 1949 [
7 U.S.C.
1441 et seq.], acreage devoted to resource-conserving crops as part of a resource-conserving crop rotation under this program may also be designated as conservation use acreage for the purpose of fulfilling any provisions under any acreage limitation or land diversion program and up to 50 percent of the acreage so designated shall be without restrictions on haying and grazing, except as provided in paragraph (5)(B), except that such acreage that is devoted to perennial cover on which cost-share assistance for the establishment of the perennial cover has been provided, shall not be credited towards the producer’s resource-conserving crop requirement under a contract under this section.