old rice; rice remaining from the previous year's harvest
new rice; first rice crop of the year
古米は新米より価格が安い。
Old rice is cheaper than new rice.
備蓄していた古米を放出した。
The stockpiled old rice was released.
古米でも炊き方次第で美味しくなる。
Even old rice can taste good depending on how you cook it.