In agricultural field improvement project that was started in the 1960s, farm lands were re-divided using 30 are (30m x 100m) as a unit, so many remains of jori were lost.
1960年代に始まる圃場整備事業では、農地が30アール(30mx100m)を基準に区画しなおされたため、多くの条里遺構が消滅した。