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Research of Appropriate Seedling Period of Plug-seedling in Platycodon grandiflorum
Jae-Ki Song(송재기),Yong Nam Cho(조용남),Yeong Bin Kim(김영빈),Sang Eun Lee(이상은),Tae Won Kim(김태원),Jae Hyeok Choi(최재혁),Young Ho Chang(장영호) 한국약용작물학회 2021 한국약용작물학회 학술대회논문집 Vol.2021 No.1
Background : Platycodon grandiflorum is principal medicinal crops and widely used as medicinal purpose or vegetable. It is cultivated by direct sowing or seedling transplanting cultivation. It costs a lot of weed control efforts in direct sowing cultivation and there are root cutting and other disadvantages in common seedling transplanting cultivation. Therefore, this study was carried out to investigate appropriate seedling period of plug-seedling in Platycodon grandiflorum for the establishment of stable seedling transplanting cultivation. Methods and Results : Platycodon grandiflorum seeds were harvested at the Medicinal Resources research department of Gyeongsangnam-do Agricultural Research and Extension Services at the end of October 2018. The seeds were sown on 128 spherical seedling trays from the middle of February 2019 until the end of March 2019, and grown for 30, 40, 50, 60 and 70 days in glasshouse. 70 days after first seedling, seedling growth characteristics such as emergence rate, plant length, stem diameter and other factors were investigated in late April 2019. After transplanting into the field, growth characteristics such as percentage of establishment, root fresh weight, root dry weight and other factors were investigated in the middle of October 2019. As a result, seedling growth characteristics such as plant length (7.8 ㎝), stem diameter (1.63 ㎜), leaf length (3.8 ㎝), leaf width (2.5 ㎝), shoot fresh weight per hill (0.53 g) were the highest at 60 days and emergence rate (78.6%) was the highest at 70 days. Field growth characteristics such as b looming period (July 9) was the fastest and root fresh weight per hill (193.5 g), root dry weight per hill (53.6 g) were the highest at 60 days and percentage of establishment (92.5%) was the highest at 50 days. Conclusion : In the seedling stage, considering plant length, stem diameter, leaf length, leaf width and shoot fresh weight per hill, 60 days seedling was excellent seedling growth characteristics. In the field stage, considering root fresh weight per hill, root dry weight per hill and blooming period, 60 days seedling was excellent field growth characteristics.