In this paper has been investigated the earth temperatures of paddy field and pot for agricultural experiment use at various depths in which the rice-plant would be grown. The following results have emerged:
1. The daily variations in temperature are greatest in the soil of po_??_ and become less for each increase in soil depth at paddy field, It is most interest, that the diurnal range in the earth temperature of the paddy field is considerabe to depths of about 7cm. but in the earth temperature of pot is conspcuous to depths of about from 7cm to 19cm.
2. The earth temperature of pot is generally very higher than the earth temperature iu paddy field on the clear day, but on the rainy day its' slightly lower than the other.
3. The soil temperatures of various parts (east, south, north, west and center) in pot changes with taking the placc of the sun, and therefore the difference between the soil temperature of the one side of pot, which it exposes to the sun, and of the other side of the pot, is very larg.
The difference of soil temperature between common paddy field and Pot will have considerable influence upon the plant growth, yet the actual effccts are not known at all.
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