Growth characteristics and ginsenoside contents of Korean ginseng (Panax ginseng C.A. Meyer) by shade materials and green manure crops

This research project aimed at investigating the effect of shading nets and use of green manure crops on the growth, development, and quality of ginseng. The growth experiments were performed at a preparation field, and the obtained results are reported below. Leaf width of ginseng under the shading net of a two-layered blue and two-layered black polyethylene net (TBTBPN) was more than 0.5 cm larger in the rye and hairy vetch cultured group than in the barley cultured. Leaf length of ginseng under the shading net of a three-layered blue and one-layered black polyethylene net (TBOBPN) was good for the barley and hairy vetch cultured group. Meanwhile, leaf width of ginseng shaded under TBOBPN was 0.9 cm larger than at hairy vetch cultured group. The leaf length of ginseng under a blue polyethylene sheet (BPS) was good for the barley as well as the barley and hairy vetch cultured group, but stem length was shorter compare to other shading net cultivation methods. Root weight of ginseng was good under the shading of TBTBPN for the rye and hairy vetch cultured group, and was good under the shading of TBOBPN for the barley and hairy vetch cultured group, but there was no significant difference under blackout screen according to manure crop varieties. The ratio of rusty root was 10.2% for the barley cultured group under the shading of TBTBPN, and was 23.1% for the hairy vetch cultured group under shading of TBOBPN. The ratio of rusty root was lowest for the rye-cultured group regardless the shading nets. The content of ginsenoside was highest in the rye-cultured group shaded under TBTBPN and BPS, with 22.8 mg/g and 26.6 mg/g, respectively. But it was highest in the barley-cultured group shaded under TBOBPN.

Keywords: Ginseng, green manure, ginsenoside, growth.

References:

[1] Reeleder RD, Hoke SM, Zhang Y. Rusted root of ginseng (Panax quinquefoius) is caused by a species of Rhexocercosporidium. Phytopathology 2006; 96: 1243 – 1254.

[2] Lee SW, Yeon BY, Hyun DY, Hyun GS, Park CG, Kim TS, Cha SW. Effects of compost application level on seedling growth of Panax ginseng C. A. Meyer. Korean J Med Crop Sci 2007; 15: 138 – 141.

[3] Kang S W, Yeon BY, Hyeon GS, Bae YS, Lee SW, Seong NS. Changes of soil chemical properties and root injury ratio by progress years of post-harvest in continuous cropping soils of ginseng. Korean J Med Crop Sci 2007; 15: 157 – 161.

[4] Suh JS, Noh HJ, Kwon JS. Effects of amendments on the phosphate-solubilizing bacteria in rice paddy soils. J Korean Soc Soil Sci Fert 2008; 41: 342 – 347.

[5] Lee SW, Kim CG, Hyun DY, Yeon BY, Lee KW, Cha SW. Effects of light transmission ratio and soil moisture content on growth characteristics of seedling in Panax ginseng C. A. Meyer. Korean J Med Crop Sci 2008; 16: 207 – 210.