The temperature and relative humidity in the experimental site
were measured every 10 min during the culture periods at 1 m
above the ground using a thermo recorder (TR-72U; T&D Co., Japan).
The soil temperature was measured at depths of 10 cm. The air
temperature and relative humidity were 27.4
±
3.0 ◦C (mean
±
SD)
and 66
±
12%, respectively. The soil temperatures in plots irrigated
every day, every three days and every six days were 27.1
±
1.9 ◦C,
28.3
±
1.7 ◦C and 30.4
±
1.6 ◦C, respectively.