Abstract
The effect of low temperature at night on the growth of young tea plant was examined using two years-old plants of several varieties cultivated in pots. The air temperature of thermostats was regulated as follows ;
by day at night
(9.30a.m.-4.30.P.m.)
30°C.
30
30
25
25
25
(4.30p.m.-8.30a.m.)
30°C
25
20
25
20
15
By varing the temperature from 30°C.to 25°C.(or 20°C.), the growth rate of shoots showed superior or similar to that at a constant temperature 30°C.
By varing the temperature from 25°C. to 20°C. (or 15°C.), however, the growth rate of shoots showed inferior to that at a constant temperature 25°C.
