Production methods for high-quality ginsengs for various advanced medical applications
of today and the future are developing continuously. This research project aimed at
exploring the growth of Panax ginseng at different microclimate-changes induced by using different shading materials and
by analyzing the ginsenosides produced in P. ginseng grown under different shading material. The temperatures under the shading materials
from June to October was high in order of Blue polyethylene sheet (BPS) > Aluminium-coated
polyethylene sheet (ACPS) > Three-layered blue and one-layered black polyethylene
net (TBOBPN). Particularly BPS showed the highest light transmission of 381.7µmol/s/m2 in August, which generated high temperature in the ginseng field. The growth of aerial
parts from the 2 – 3 year old ginsengs were vigorous in order of TBOBPN > ACPS > BPS,
whereas BPS with high light transmission rate also allowed strong growth of 4 year
old ginsengs. Root growth in terms of root length and root diameter by different shading
materials was satisfactory, regardless of root age, in the order of ACPS > BPS > TBOBPN.
More specifically, root length was 23.2 cm longer for 2 year-old roots, 28.3 cm longer
for 3 year-old roots, and 29.3 cm longer for 4 year-old roots in the plots treated
with ACPS compared to TBOBPN and BPS plots – and root diameter showed the same results
as root length. However, the root weight was essentially identical for the three shading
materials for all age groups, except for the 4-year old root of ACPS-shaded ginseng
that showed 2.96 kg dry material per 1.62 m2 field, i.e., about 8% increase in yield compared to the plot shaded with TBOBPN.
The content of ginsenosides Rg2, Rf, Re and Rd in the plot treated with ACPS was higher
than in both BPS and TBOBPN plots. Thus, the total ginsenoside content of 4-years-old
roots was 20.92 mg/g dry material for ACPS-shaded ginseng and 20.38 and 15.89 mg/g
dry material for BPS-shaded and TBOBPN-shaded ginseng, respectively.
Keywords: Ginseng, sunshade material, ginsenoside, growth.
References:
[1] Lee SW, Yeon BY, Park KC, Lee SH, Kim GS, Jang IB, Kim YB, Cha SW. Growth characteristics and ginsenoside contents of 6-year-old ginseng (Panax ginseng C.A. Meyer) by shade materials in paddy field. Korean J Med Crop Sci 2013; 21: 118
– 123
[2] Won JY, Lee CY, Oh DJ, Kim SM. Changes of chlorophyll fluorescence and photosynthesis under different shade materials
in Korea ginseng (panax ginseng C.A. Meyer). Korean J Crop Sci 2008; 16: 416 – 420
[3] Cheon SK, Lee TS, Yoon SS, Mok SK. Effect of light transmittance control on the root yield and quality during the growing
season of Panax ginseng. Korean J Ginseng Res 2004; 28: 196 – 200
[4] Cheon SK, Lee TS, Yoon SS, Mok SK. Effect of light transmittance control on the growth season of Panax ginseng. Korean J Ginseng Res 2003; 27: 202 – 206
[5] Park H, Yoon JH, Byen JS, Cho BG. Effects of growth light and planting density on yield and quality of panax ginseng C.A. Meyer. Korean J Crop Sci 1987; 32: 386 – 391
