; or (ii) is likely to be returned to the previous agricultural use. (B) Requirement The Secretary shall establish procedures to identify land described in subparagraph (A). 4. Payment yields (a) Establishment and purpose For the purpose of making price loss coverage payments under section 7, the Secretary shall provide for the establishment of a yield for each farm for any designated oilseed for which a payment yield was not established under section 1102 of the Food, Conservation, and Energy Act of 2008 ( 7 U.S.C. 8712 ) in accordance with this section. (b) Payment yields for designated oilseeds (1) Determination of average yield In the case of designated oilseeds, the Secretary shall determine the average yield per planted acre for the designated oilseed on a farm for the 1998 through 2001 crop years, excluding any crop year in which the acreage planted to the designated oilseed was zero. (2) Adjustment for payment yield (A) In general The payment yield for a farm for a designated oilseed shall be equal to the product of the following: (i) The average yield for the designated oilseed determined under paragraph (1). (ii) The ratio resulting from dividing the national average yield for the designated oilseed for the 1981 through 1985 crops by the national average yield for the designated oilseed for the 1998 through 2001 crops. (B) No national average yield information available To the extent that national average yield information for a designated oilseed is not available, the Secretary shall use such information as the Secretary determines to be fair and equitable to establish a national average yield under this section. (3) Use of county average yield If the yield per planted acre for a crop of a designated oilseed for a farm for any of the 1998 through 2001 crop years was less than 75 percent of the county yield for that designated oilseed, the Secretary shall assign a yield for that crop year equal to 75 percent of the county yield for the purpose of determining the average under paragraph (1). (c) Effect