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Short-wave radiation flux 20 W m'2 30 W m"2

Short-wave radiation flux 20 W m'2 30 W m"2

Short-wave radiation flux 30 Wm'2 30 W m~2

Figure 11. Air current pattern and speed per second in the Magenta type polycarbonate vessel (air volume: 370 ml) as affected by short-wave radiation flux, presence/absence of activated charcoal in the culture medium and the size of plantlets in the vessel (Kitaya et al., 1995). Upper vessel containing white-translucent agar medium with absence of activated charcoal and plantlet, middle vessel containing black-colored agar medium with presence of activated charcoal and without plantlets, and lower vessel containing black-colored agar medium with presence of activated charcoal and relatively small or large plantlet. The number of air exchanges of the vessel was 0.4 h'1 and the air current speed above the vessel was 1 m s'1. Shortwave radiation fluxes of 20 W m'2 and 30 W m'2 correspond to PPF of 70 and 105 /umol m'2 s-1, respectively. Air current pattern and air current speed were visualized by using a video camera for taking a moving picture of metaldehyde ((C2H4O)4) particles used as tracers.

Figure 11. Air current pattern and speed per second in the Magenta type polycarbonate vessel (air volume: 370 ml) as affected by short-wave radiation flux, presence/absence of activated charcoal in the culture medium and the size of plantlets in the vessel (Kitaya et al., 1995). Upper vessel containing white-translucent agar medium with absence of activated charcoal and plantlet, middle vessel containing black-colored agar medium with presence of activated charcoal and without plantlets, and lower vessel containing black-colored agar medium with presence of activated charcoal and relatively small or large plantlet. The number of air exchanges of the vessel was 0.4 h'1 and the air current speed above the vessel was 1 m s'1. Shortwave radiation fluxes of 20 W m'2 and 30 W m'2 correspond to PPF of 70 and 105 /umol m'2 s-1, respectively. Air current pattern and air current speed were visualized by using a video camera for taking a moving picture of metaldehyde ((C2H4O)4) particles used as tracers.

2.5. Temperature

Air temperature in the vessel during the dark period is almost the same as that in the culture room. However, air temperature during the photoperiod is 1-2 C higher inside the vessel than outside (Figure 13). The difference in air temperature between inside and outside the vessel increases with increasing shortwave or PAR radiation at the top of vessel. Practically, the number of air exchanges of the vessel does not influence the air temperature in the vessel. When activated charcoal is added to the culture medium, the medium surface temperature and, thus, air temperature in the vessel is raised due to its high absorptance of shortwave radiation.

inlets inlets

outlet

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Sweetpotato plantlet

Air distribution pipes

Multi-cell tray outlet

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Sweetpotato plantlet

Air distribution pipes

Multi-cell tray

AJr current speed -

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