The Relationship between the Shallow Groundwater Temperature near the Water Table and the Air Temperature in Paddy Fields

1. Introbuction Because the temperature of water and soil directly effects the growth of cr6ps; it is important to know the temperature of water, including shallow groundwater, as well as to know its quantity. Therefore a lot of investigations have been undertaken concerning this problem. Some have tried to construct an equation to calculate the value of soil temperature. For example, AZUMA") constructed a linear equation to calculate the yearly average temperature of soil from the yearly average air temperature. We have tried here, however, to construct a linear equation calculating the value of shallow groundwater temperature near the water table from air temperature for a given area for a given month.