PURPOSE: To obtain the title to indicate harvesting time or maturation period especially of rice plant by comparing the accumulated temperature of average atmospheric temperature at 24 hour intervals of temperature with a set point and showing difference thereof.
CONSTITUTION: A temperature sensor 11 and a ten key 6 are connected to a calculating control part 16 and average atmospheric temperature at 24 hour intervals of temperature by the temperature sensor 11 and the accumulated temperature thereof are calculated at the calculating control part 16. In a memory part 12, the accumulated temperature and the set point thereof are memorized, the accumulated temperature is compared with the set point in a comparison part 13 and difference between the accumulated temperature and the set point is visibly indicated in a display part 14.
SATAKE SATORU
SATO KOTARO
