Being official grains under the control of Kokushi (provincial governor), it was prohibited from being offered as suiko (government loans, often seed rice, made to peasants in Japan from the 7th through 12th centuries) in the same way as shozei (the rice tax stored in provincial offices warehouse) and it remained even after the integration of official grains in 734.
国司が監督する官稲であるが、正税のように出挙に出すことは禁じられた他、天平6年（734年）の官稲混合以後も存置された。