Korean Journal of Environmental Agriculture (한국환경농학회지)

The Korean Society of Environmental Agriculture (한국환경농학회)
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Supplementary Blue and Red Radiation at Sunrise and Sunset Influences Growth of Ageratum, African Marigold, and Salvia Plants

  • Heo, Jeong-Wook (Climate Change & Agroecology Division, Department of Agricultural Environment, National Academy of Agricultural Science, Rural Development Administration) ;
  • Lee, Yong-Beom (Agricultural Safety Engineering Division, Department of Agricultural Engineering, National Academy of Agricultural Science, Rural Development Administration) ;
  • Bang, Hea-Son (Climate Change & Agroecology Division, Department of Agricultural Environment, National Academy of Agricultural Science, Rural Development Administration) ;
  • Hong, Seung-Gil (Climate Change & Agroecology Division, Department of Agricultural Environment, National Academy of Agricultural Science, Rural Development Administration) ;
  • Kang, Kee-Kyung (Climate Change & Agroecology Division, Department of Agricultural Environment, National Academy of Agricultural Science, Rural Development Administration)
  • Received : 2011.07.26
  • Accepted : 2011.10.31
  • Published : 2011.12.31
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Abstract

BACKGROUND: Light-emitting diodes (LEDs) with lower electric cost and the specific wavelength have been considering as a novel light source for plant production in greenhouse conditions as well as in a closed culture system. Supplementary lighting for day-length extension was considered as light intensity, light quality, and/or photoperiod control on plant growth and development. Effects of supplementary blue or red LED radiation with lower light intensity on growth of Ageratum (Ageratum houstonianum Mill., cv. Blue Field), African marigold (Tagetes erecta L., cv. Orange Boy), and Salvia (Salvia splendens F. Sello ex Ruem & Schult., cv. Red Vista) were discussed during sunrise and sunset twilight in the experiment. METHODS AND RESULTS: Supplementary lighting by blue and red LEDs for 30 (Treatment B30; R30) or 60 (Treatment B60; R60) min. per day were established in greenhouse conditions. Photosynthetic photon flux for supplementary radiation was kept at $15{\mu}mol\;m^{-2}\;s^{-1}$ on the culture bed. Natural condition without supplementary light was considered as a control. The highest shoot and root dry weights were shown in African marigold exposed by red light for 60 min. per day. Supplementary blue and red lighting regardless of the radiation time significantly stimulated development of lateral branches in African marigold. Stem growth in Ageratum and Salvia seedlings was significantly promoted by red radiation as well as natural light. CONCLUSIONS: Extending of the radiation time at sunrise and sunset twilight using LEDs stimulated reproductive growth of flowering plant species. Different characteristics on growth under supplementary blue or red lighting conditions were also observed in the seedlings during supplementary radiation.

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References

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