Nenryososhomai was the term for the shomai (milled rice) itself or the system determined by Daijokanpu (official documents issued by Daijokan, Grand Council of State) during the Heian period which required the raw grain collected as So in the provinces to be tithed to the central government as refined white rice
年料租舂米（ねんりょうそしょうまい）とは、平安時代に太政官符によって、令制国の租の稲穀を精米した白米を中央に貢進させる制度、またその舂米そのもののこと。