Within the 60-day period immediately preceding the effective date of an order, as provided in section 7483(b)(3) of this title, the Secretary shall conduct a referendum among processors who, during a representative period as determined by the Secretary, have been engaged in processing, for the purpose of ascertaining whether the order shall go into effect.

The order shall become effective, as provided in section 7483(b) of this title, only if the Secretary determines that the order has been approved by not less than a majority of the processors voting in the referendum and if the majority processed more than 50 percent of the popcorn certified as having been processed, during the representative period, by the processors voting.