In order to research the difference of environment of fruits surface among a bare fruit, a fruit covered with a paper bag and that covered with a torn paper bag, the author carried out the obsevation of temperature of fruit surface (apple), air temperature, humidity in a paper bag, wind velocity and solar, sky radiation.
The results are as follows;
1) The upper surface temperature of the bare fruit, the fruit covered with paper bag and that covered with torn paper bag were higher than the air temperature with differences of 11-14°C, 5-6°C and 3-4°C, respectively, during day time as shown in Fig. 2.
2) The water vapor pressure in the paper bag was higher than that of air as shown in Fig. 3, and it is imagined that the water vapor pressure in the torn bag nearly epuals to that of air.
3) Owing to the paucity of change of environment the fruit covered with torn paper bag had a small sunburn than that covered with paper bag when the bag was removed.