(a) The Secretary may, at any time, terminate the provisions of this subpart by giving at least one day's notice by means of a press release or in any other manner which he may determine.
(b) The Secretary may terminate or suspend the operations of any or all of the provisions of this subpart whenever he finds that such provisions do not tend to effectuate the declared policy of the act.
(c) The Secretary shall terminate the provisions of this subpart at the end of any fiscal year whenever he finds that such termination is favored by a majority of producers who, during the preceding fiscal year have been engaged in the production for market of potatoes: Provided, That such majority has, during such year, produced for market more than fifty percent of the volume of such potatoes produced for market; but such termination shall be effected only if announced on or before October 31, of the then current fiscal year.
(d) The provisions of this subpart shall, in any event, terminate whenever the provisions of the act authorizing them, cease to be in effect.