There was a push for redevelopment and maintaining fields, so Jyokoden were chinso (leased to farmers, 6 years for Koden and 3 years for Shiden under the Ritsuryo system) and benefits were given to those who requested.
常荒田については希望者に賃租（律令では、公田6年・私田3年）して特典を付けて再開発を奨励して土地の維持を図っている。