2007 Fiscal Year Final Research Report Summary
Plant growth and responses under totally controlled environmental systems and their application for plant production
| Project/Area Number |
16208025
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Agricultural environmental engineering
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| Research Institution | Chiba University |
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Principal Investigator |
KOZAI Toyoki Chiba University, President (90081570)
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| Co-Investigator(Kenkyū-buntansha) |
GOTO Eiji Chiba University, Faculty of Horticulture, Professor (00186884)
MARUO Toru Chiba University, Faculty of Horticulture, Associate Professor (20143266)
TAKAGAKI Michiko Chiba University, Faculty of Horticulture, Associate Professor (00206715)
ISHIGAMI Yasuhiro Chiba University, Faculty of Horticulture, Assistant Professor (50361415)
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| Project Period (FY) |
2004 – 2007
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| Keywords | closed system / artificial light / environmental control / medicinal plant / plant growth and responses / environment conservation / laborsaving / high-value plant production |
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| Research Abstract |
This research presented fundamental knowledge on production of high-value nursery plants using a closed plant production system under energy saving, resource saving, laborsaving and space saving conditions. It also gave basic data for development of a practical system in agriculture. Major outcome are as follows. 1) Growth of tomato plants was promoted by extending the light period daily or by using all-day lighting. 2) Medicinal component concentration and growth of St John's wort ( Hypericum) were affected by temperature, light quality, timing of harvest time and inheritance. The result indicated possibility of commercial production of medicinal plants using a closed plant production system. 3) The effects of leaf area index of tomato seedlings and ventilation on water use efficiency and CO2 use efficiency in a closed system were investigated and a method to increase these efficiencies was proposed. 4) An advanced fogging system for greenhouse cooling was developed using a new control algorithm. Effective combination of the cooling system and a new CO2 enrichment system was proposed to maintain suitable temperature, relative humidity and CO2 concentration at optimal levels in a greenhouse. 5) It was found that using a closed plant production system enables production of seedlings at a high planting density and shortening of period of seedling production.
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