Korean Journal of Plant Resources (한국자원식물학회지)

The Plant Resources Society of Korea (한국자원식물학회)
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Effect of the Cold Treatment Period on a Plant's Dormancy Breaking in the Winter Production of Gomchwi's New Varieties (Ligularia fischeri (Ledeb.) Turcz)

  • Suh, Jong Taek (Highland Agricultural Research Institute, National Institute of Crop Science, RDA) ;
  • Kim, Ki Deog (Highland Agricultural Research Institute, National Institute of Crop Science, RDA) ;
  • Kim, Su Jeong (Highland Agricultural Research Institute, National Institute of Crop Science, RDA) ;
  • Sohn, Hwang Bae (Highland Agricultural Research Institute, National Institute of Crop Science, RDA) ;
  • Hong, Su Young (Highland Agricultural Research Institute, National Institute of Crop Science, RDA) ;
  • Kim, Yul Ho (Highland Agricultural Research Institute, National Institute of Crop Science, RDA)
  • Received : 2019.09.19
  • Accepted : 2019.11.28
  • Published : 2019.12.31
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Abstract

This study was conducted to determine the number of days required to break a plant's dormancy and promote subsequent crop growth in new varieties of Gomchwi through the 4℃ treatment. Three new varieties of Gomchwi namely, 'Sammany', 'Gommany', and 'Damogy' were observed in this study. The rate of leaf emergence of 'Sammany' after 15-day of 4℃ treatment was 100%, while 'Gommany', and 'Damogy' took 20-days and 10-days, respectively to reach to 97.9% rate of leaf emergence. After 10-days of 4℃ treatment, 'Damogy' grew faster than the other varieties. and Harvest time for 'Damogy' was on January 18th, after 5-days of 4℃ treatment and yield was observed to be the highest at 15-days of 4℃ treatment. 'Sammany' was next with a minimum of 10-days of 4℃ treatment, although 15-days is more preferred for better harvest. 'Gommany' on the other hand, did not grow enough for harvest by January 18th, and its harvest time was delayed to January 31st. It needed a minimum of 15-days and preferentially 20-days of 4℃ treatment to grow normally and be ready for harvest. The plant height, leaf length and leaf petiole length appeared to grow better by extending duration of the 4℃ treatment. The number of leaves of 'Sammany' and 'Gommany' varieties was three leaves for the 5-days treatment which may be due to the incomplete breaking of dormancy. Regarding the yield per plant, 'Sammany' yielded 112.3 grams (g) in 15-days treatment, and 'Gommany' yielded 106.5 g in 25-days treatment. In the case of 'Damogy', it yielded 123.5 g and 183 g in the 10-days and 25-days treatment respectively. It is concluded that 'Damogy', 'Sammany' and 'Gommany requires 10, 15, and 20 days of 4℃ treatment to break the plant's dormancy and promote better plant growth.

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References

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