Background : Jiwhang (Rehmannia glutinosa L.) cultivation area of chungnam province was 62ha(219 farms, 53.9% of domestic cultivation area, M.A.F.R.A. 20142)). Recently, jiwhang is rapidly spread to 150ha ( Geumsan administration statistics, 2015) as taking place of income crop in Chungnam. High quality jiwhang GAP production and improvement of the distribution system including magnus customers, producer association fosterage and conventional market Vitalization were the reason of rapid cultivation area increase of Rehmannia glutinosa L. in Geumsan. This study was performed to set up the standard Rhizome size for planting in Rehmannia glutinosa L. Materials and Methods ○ Experiment variety : Togang ○ Treatment(rhizome length) : ① 1cm ② 2cm ③ 3cm ④ 4cm ⑤ 6cm(control) ○ Planting date : May 6, 2015 ○ Planting distance : 30×15cm ○ Experiment place : Ginseng and Medicinal Plant Research Institute (Geumsan-gun, Chungcheongnam-do) Conclusion : In the aboveground growth was no significant difference among treatments. In the root characteristics, there was no significant difference among treatments. Take a 1∼2cm rhizome planting saved rhizome amount and planting time to 73.8%∼64.3% and 68.4%∼ 57.8% respectively than 6cm(control).

• Seung Ho Han(Ginseng and Medicinal Plant Research Institute, CNARES) | 한승호
• Gwan Hou Kim(Chungcheongnam-Do Agricultural Research and Extension Services) | 김관후
• Bong Jae Seong(Ginseng and Medicinal Plant Research Institute, CNARES) | 성봉재
• Sun Ick Kim(Ginseng and Medicinal Plant Research Institute, CNARES) | 김선익
• Ka Soon Lee(Ginseng and Medicinal Plant Research Institute, CNARES) | 이가순
• Su Dong Kim(Ginseng and Medicinal Plant Research Institute, CNARES) | 김수동
• Moo Geun Jee(Ginseng and Medicinal Plant Research Institute, CNARES) | 지무근
• Young Hwan Yoon(Chungcheongnam-Do Agricultural Research and Extension Services) | 윤영환
• Hyun Ho Kim(Ginseng and Medicinal Plant Research Institute, CNARES) | 김현호 Corresponding author