Abstract
The electric energy utilization efficiency (E E ), water utilization efficiency (E E ) and CO2 utilization efficiency (E C ) of a closed-type transplant production system (CTPS) were estimated. Sweetpotato (Ipomoea batatas (L.) Lam. cv. Beniazuma) plants were grown for 15 days in the CTPS. The E E , E W and E C of the CTPS were 0.006, 0.93 and 0.92, respectively. These results indicate that E W and E C are more than several times higher in the CTPS than in an open-type transplant production system such as a greenhouse. The E E of the CTPS was relatively low compared to E W and E C and can be further improved by more efficient lighting and air conditioning systems. Therefore, the CTPS is suitable for transplant production with reduced consumption of energy and resources.
Published Version
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