In the year, in which the Onie no matsuri Festival would be held, at first, Shoshi (Governor of the Board of Retainers) decided by fortunetelling a province and a county for the Yuki and the Suki in order to select the rice fields that would provide rice plants for the festival.
大嘗祭が行われる年には、まず、所司（官庁の役人）が、その祭に供えるイネを出す斎田を選ぶため、悠紀（ゆき）・主基（すき）の国・郡を卜定（ぼくじょう）する。