Abstract
The experiments were made to know the relation between the rate of transpiration and distribution of sweet potato varieties. 1) Rate of transpiration in NORIN No.1 and OKINAWA No. 100, varieties cultivated in the eastern Japan, increases at 24°-26°C, but shows decrease at 27-28°C, while that of NORIN No.2, GOKOKU, and SHICHIFUKU, these are grown in the south-western Japan, increases at 27-28°C and decreases at 24-26°C 2) The response of transpiration for temperature is supposed to have some bearing on the geo-graphical distribution of sweet potato varieties.
