Flower Initiation and Development in Cymbidium by Night Interruption with Potassium and Nitrogen
2012
An, H.R., Seoul National University, Seoul, Republic of Korea | Kim, Y.J., Seoul National University, Seoul, Republic of Korea | Kim, K.S., Seoul National University, Seoul, Republic of Korea
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 μmolㆍm-²ㆍs-¹ and at a high light intensity NI (HNI) of 120 μmolㆍm-²ㆍs-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 mgㆍL-¹. The plants grown under LNI conditions had 75% inflorescence emergence when 200 mgㆍL-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 mgㆍL-¹ under LNI and 400 mgㆍL-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 mgㆍL-¹ and 400 mgㆍL-¹ for plants grown under LNI and HNI conditions, respectively, after inflorescence emergence is recommended.
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