Greenhouse

Increase in yearly productivity per floor area of the closed system is about 10 times that of a standard greenhouse for many kinds of transplants, as explained below and Table 14.

1) The ratio of planting area to floor area is usually 0.8 in the greenhouse, while it is 2.0 to 3.0 in the closed system with use of the multi-shelves (4 or 5 shelves). Thus, planting area per floor area of the closed system is about 2-3 times that of the greenhouse. On the other hand, use of multi-shelves is not practical in the greenhouse using solar light because of obstruction of solar light by the multi-layered shelves.

Figure 11. Uniform growth of cucumber (cv. encore 10) seedlings to be used as scions for grafting (Day 7).
Forced Ventilation Greenhouses

Scion : encore 10, stock : Hikari Power G

Figure 12. Grafted cucumber transplant 19 days after sowing, nursed in the closed system (Left). Seedlings used as scions (Upper Right) and those used as root stock plants (Lower Right) were grown in the closed system. Percent success of grafting is over 90%.

Scion : encore 10, stock : Hikari Power G

Figure 12. Grafted cucumber transplant 19 days after sowing, nursed in the closed system (Left). Seedlings used as scions (Upper Right) and those used as root stock plants (Lower Right) were grown in the closed system. Percent success of grafting is over 90%.

200 cells/tray 288 cells/tray

Closed system

200 cells/tray 288 cells/tray

Greenhouse

Figure 14. Crisp head lettuce (cv. Cisco) transplants grown for 16 days after sowing in the closed system using 200- and 288-cell trays show wider leaves and shorter hypocotyls than those grown for 16 days after sowing in the greenhouse.

Greenhouse : Sown on Oct. 18

Figure 15. Cabbage (cv. Kinkei 201) transplants grown for 14 days after sowing under a photoperiod of 16 h d1 are larger and are characterized by wider leaves and shorter hypocotyls than those grown for 14 days after sowing in the greenhouse during October.

Building Your Own Greenhouse

Building Your Own Greenhouse

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