Nenryo betsuno sokoku was rice kept as seed at the local level, separate from that of So collected in the Shoso (warehouse) of Ritsuryo provinces as Fudokoku (staples for an emergency), and was given to kyokan (an official of the Capital) as Iroku, Kiroku and Ifukuryo based on the Daijokanpu (official documents issued by Daijokan, Grand Council of State) when the central government did not have sufficient funds.
年料別納租穀（ねんりょうべつのうそこく）とは、平安時代に令制国の正倉に納められた租を不動穀とは別に稲穀の形態で現地で保管して、中央において財政が不足した折に太政官符に基づいて位禄・季禄・衣服料として京官に支給したもの。