Oshima, T., Ohashi-Kaneko, K., Ono, E. and Watanabe, H. (2015) Determination of Optimum Red and Blue Lighting Conditions for Production of Red-leaf Lettuce Cultured under LEDs. Journal of Society of High Technology in Agriculture, 27, 24-32. (in Japanese)
https://doi.org/10.2525/shita.27.24

has been cited by the following article:

• TITLE: Study of Plant Cultivation Using a Light-Emitting Diode Illumination System to Control the Spectral Irradiance Distribution

  AUTHORS: Atsushi Motogaito, Naoki Hashimoto, Kazumasa Hiramatsu, Katsusuke Murakami

  KEYWORDS: Plant Cultivation, LED Lighting, Blue and Red Photon Flux (B/R) Ratio

  JOURNAL NAME: Optics and Photonics Journal, Vol.7 No.6, June 7, 2017

  ABSTRACT: In plant cultivation, the number of photons is more important than the light energy from the chemical reactions that occur during photosynthesis. In addition, the blue and red photon flux (B/R) ratio is an important parameter for plant cultivation. Here we discuss the effect of the spectral irradiance distribution and the B/R ratio on plant cultivation. We cultivated lettuce seedlings, Lactuca sativa L. Cv. Okayama, using a light-emitting diode illumination system that can precisely control the spectral irradiance distribution and B/R ratio. The B/R ratio varied from 0.36 to 2.06 according to the intensity of the blue light when the photosynthetic photon flux density values were sufficient to ensure the 150 - 200μmol⋅m−2⋅s−1.High photon flux densities of blue light result in reduced plant length, plant height, and leaf area, thereby suggesting its role in the suppression of leaf growth. Therefore, we conclude that a lower photon flux of blue light (B/R Ratio) is optimal for lettuce cultivation.