PURPOSE: To prevent quality from deteriorating for a long period, simultaneously stabilize moisture content, improve the taste and keep excellent quality by regulating grains in warehousing to a constant temperature, keeping the temperature for a prescribed period, further determining the grain temperature and storing the grains in the winter season.

CONSTITUTION: For example, when the grain temperature of unpolished rice in warehousing is lower than the standard value for storing in a warehouse, the temperature is increased at 2-3°C per day and kept at 18-23°C and 75-85% humidity for 1-2 weeks. The temperature and humidity are subsequently lowered to 13-18°C temperature and 70-75% humidity and stored in the intact state.