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

  title={Potential Use of a 24-Hour Photoperiod (Continuous Light) with Alternating Air Temperature for Production of Tomato Plug Transplants in a Closed System},
  author={Katsumi Ohyama and Koji Manabe and Yoshitaka Omura and Toyoki Kozai and Chieri Kubota},
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 ). Airtemperatures were alternated between 28 °C during the first 16 hours and 16 °C for the… 

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