Flower initiation and development in Cymbidium by night interruption with potassium and nitrogen

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This study was conducted to investigate the effects of potassium (K) and nitrogen (N) on flower initiation and development when applied in conjunction with night interruption (NI) in Cymbidium ‘Red Fire’. The experimental plants were grown with NI at a low light intensity (LNI) of 3–7 μmol·m−2·s−1 and at a high light intensity NI (HNI) of 120 μmol m−2·s−1 for 4 hours (22:00 to 02:00 HR), whereas control plants were grown under 9 hours photoperiod condition. The concentrations of K and N used in each experiment were 0, 100, 200, and 400 mg·L−1. The plants grown under LNI conditions had 75% inflorescence emergence when 200 mg·L−1 K was supplied, while no inflorescence emerged in control plants, despite the application of K fertilizer. Flower diameter, as well as inflorescence length and diameter increased with an increasing N application up to 200 mg·L−1 under LNI and 400 mg·L−1 under HNI conditions. K fertilization during the adult vegetative stage in Cymbidium grown under LNI artificially induced inflorescence, but the flower quality of the plants decreased relative to those grown under HNI. To improve the flower quality, maintaining N at 200 mg·L−1 and 400 mg·L−1 for plants grown under LNI and HNI conditions, respectively, after inflorescence emergence is recommended.

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Correspondence to Ki Sun Kim.

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These authors are contributed equally to this work.

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An, H.R., Kim, Y.J. & Kim, K.S. Flower initiation and development in Cymbidium by night interruption with potassium and nitrogen. Hortic. Environ. Biotechnol. 53, 204–211 (2012) doi:10.1007/s13580-012-0023-5

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Additional key words

  • flowering
  • nutrient
  • orchid
  • photoperiod
  • reproductive growth