Root Research
Online ISSN : 1880-7186
Print ISSN : 0919-2182
ISSN-L : 0919-2182
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Volume 26, Issue 1
Displaying 1-1 of 1 articles from this issue
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Original Paper
  • Effects of LED alternating irradiation on tomato seedling quality and root development after transplanting
    Akimasa Nakano, Noriko Ohtake, Tadashi Yoneda, Akiko Shinoda
    2017 Volume 26 Issue 1 Pages 3-9
    Published: 2017
    Released on J-STAGE: March 24, 2017
    DOIhttps://doi.org/10.3117/rootres.26.3
    JOURNAL FREE ACCESS
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    We evaluated the condition of LED alternating irradiation (AI) for energy saving and production of high quality seedlings. LED-AI showed more than 40% energy saving compared to control (fluorescent light) for producing of the tomato seeding. On the LED-AI, more than 2 hours, dark period, was necessary to prevent the necrosis of the seedling leaf. On the treatment of LED-AI with 4-6 hour dark period, taking root activity and fresh weight was bigger among treatments. According to δ13C values of seedlings, the longer the dark period (the stronger the light intensity) the more water stress was burden to the seedlings. Water use efficiency might be improved in the increase of length of dark period in this experiment. That is because vigorous growth of LED-AI with 4-6 hour dark period might be in the moderate water stress condition, which would be the suitable condition for making high quality tomato seedlings.
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