At the end of each 3 year period beginning with the 3 year period starting on the effective date of the order, the Secretary, if necessary, shall adjust any unit to conform with subparagraphs (A) and (B). If the Secretary makes such an adjustment, the Secretary shall reapportion the seats on the Board to conform with subparagraph (C) and any modifications made under subparagraph (F). If payment of refunds following the initial referendum conducted under section
6305
(a) of this title is authorized by producers, in making such adjustments, the Secretary shall exclude, from each State’s annual soybean production, those bushels of soybeans on which such refunds are paid.