Abstract
In order know adaptability of paddy rice varieties to early season cultivation on upland field, comparison was made between paddy rice and upland rice varieties. In general, germination, tillering, growth of top and root as well as yield are poor in paddy rice varieties. They showed larger flucluation in growth and yield than upland rice by environmental conditions, thus indicating that yield is unstable. But there is also a possibility to use successfully paddy rice if better cultural condition is provided.
