Energy and Mass Balance of a Closed-type Transplant Production System. (Part 1). Energy Balance.

Ohyama, Katsumi; Yoshinaga, Keita; Kozai, Toyoki

doi:10.2525/jshita.12.160

Cited by 12 publications

(2 citation statements)

References 2 publications

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“…Closed system. Detailed description of the closed system used in the present experiment was previously reported by Ohyama et al (2000a). This system (2.1 m long × 1.3 m wide × 1.9 m high, volume = 4.6 m 3 ) was covered with thermally insulated walls consisting of 5-cm Styrofoam sandwiched between a pair of 5-mm wooden panels, where the number of air exchanges was about 0.1 h. The closed system had three shelves each with eight highfrequency fl uorescent lamps (FHF32EX-W; Matsushita Electric Industrial Co., Osaka, Japan) and fans (EF-25ASB; Mitsubishi Electric, Tokyo, Japan).…”

Section: Methodsmentioning

confidence: 99%

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Potential Use of a 24-Hour Photoperiod (Continuous Light) with Alternating Air Temperature for Production of Tomato Plug Transplants in a Closed System

Ohyama¹,

Manabe²,

Omura³

et al. 2005

HortSci

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To evaluate the potential use of a 24-hour photoperiod for transplant production in a closed system, tomato (Lycopersicon esculentum Mill.) plug transplants were grown for 17 days either under a 24-hour photoperiod with a photosynthetic photon flux (PPF) of 200 μmol·m-2·s-1 or under a 16-hour photoperiod with a PPF of 300 μmol·m-2·s-1, resulting in the same daily integrated PPF (17.3 mol·m-2). Air temperatures were alternated between 28 °C during the first 16 hours and 16 °C for the subsequent 8 hours of each day. Fresh weight, dry weight and leaf area were 41%, 25%, and 64% greater, respectively, under the 24-hour photoperiod than under the 16-hour photoperiod. Physiological disorders (e.g., chlorosis and/or necrosis) were not observed under the 24-hour photoperiod, probably due to the alternating air temperature. Floral development of plants originating from both treatments did not differ significantly. Electric energy use efficiency of the closed system was 9% greater under the 24-hour photoperiod than under the 16-hour photoperiod. These results suggest that using a 24-hour photoperiod with relatively low PPF can reduce both initial and operational costs for transplant production in a closed system due to the reduction in the number of lamps.

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Section: Methodsmentioning

confidence: 99%

“…If no waste of the resource is generated in the closed system during the transplant production period, the use effi ciency of the resource will be 1. From this defi nition, U E was expressed by the following equation (Ohyama et al, 2000a):…”

Section: Methodsmentioning

confidence: 99%

Potential Use of a 24-Hour Photoperiod (Continuous Light) with Alternating Air Temperature for Production of Tomato Plug Transplants in a Closed System

Ohyama¹,

Manabe²,

Omura³

et al. 2005

HortSci

Self Cite

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Closed Systems with Lamps for High Quality Transplant Production at Low Costs Using Minimum Resources

Kozai¹

Photoautotrophic (Sugar-Free Medium) Micropropagation as a New Micropropagation and Transplant Production System

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Estimating the air exchange rate using water vapour as a tracer gas in a semi-closed growth chamber

Kozai

Niu

et al. 2012

Biosystems Engineering

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Energy and Mass Balance of a Closed-type Transplant Production System. (Part 1). Energy Balance.

Cited by 12 publications

References 2 publications

Potential Use of a 24-Hour Photoperiod (Continuous Light) with Alternating Air Temperature for Production of Tomato Plug Transplants in a Closed System

Potential Use of a 24-Hour Photoperiod (Continuous Light) with Alternating Air Temperature for Production of Tomato Plug Transplants in a Closed System

Closed Systems with Lamps for High Quality Transplant Production at Low Costs Using Minimum Resources

Estimating the air exchange rate using water vapour as a tracer gas in a semi-closed growth chamber

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