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ISHS Acta Horticulturae 630: XXVI International Horticultural Congress: Nursery Crops; Development, Evaluation, Production and Use

CLOSED SYSTEMS WITH LAMPS FOR COMMERCIAL PRODUCTION OF TRANSPLANTS USING MINIMAL RESOURCES

Authors:   T. Kozai, C. Chun, K. Ohyama
Keywords:   air conditioner, air current, bolting, closed system, CO2 enrichment, eggplant, environmental control, irrigation, lamp light, pansy, tomato, transplant, spinach
DOI:   10.17660/ActaHortic.2004.630.30
Abstract:
A ‘Closed transplant production system’ or simply a ‘closed system’ is defined in this article as a warehouse-like structure covered with opaque thermal insulators, in which ventilation is kept at a minimum, and artificial light is used as the sole light source for plant growth. Advantages of a closed system over a greenhouse for transplant production include: 1) rapid and uniform growth of high quality plants, 2) high productivity per floor area partly due to the use of multi-shelves, 3) high utilization efficiencies of water and CO2 due to the minimized ventilation and recycling use of dehumidified water by air conditioners, 4) high light utilization efficiency of plants due to optimized temperature, PPF, CO2 concentration and water content of the substrate, and 5) virtually no heating cost requirement in winter even in northern countries due to its thermally insulated structure. Initial and operation costs per annual production of transplants in closed systems are comparable to those in greenhouses. In the present paper, reasons and numerical examples for the statements described above are given.

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