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KMID : 0903619850260010022
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Journal of the Korean Society for Horticultural Science
1985 Volume.26 No. 1 p.22 ~ p.28
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Physiological and Ecological Studies on the Chinese Bellflower , Platycodon grandiflorum DC .
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Abstract
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The effect of soil texture, fertilizer and cultural environments on the growth and crude saponin of Chinese bellflower (Platycodon grandiflorum DC) were studied to obtain basic information for the establishment of cultivation techniques.
The results are summarized as follows.
1. The most proper soil for the culture of Chinese bellflower plants seemed to be sandy loam.
2. Promotion of growth by phosphorous and potassium. Content of N, P, Ca and Mg showed the highest peak at around July 15 in leaf and stem as well as in root. Content of potassium showed a gradually decreasing trend in leaf, stem and root. However it was proved to be that potassium was the richest in the Chinese bellflower plant among the inorganic elements analyzed during the total period of growth.
3. The contents of crude saponin in root were the highest in plants grown on sandy soil. The content increased with applying compost and poultry manure or compost and 10㎏ of N, P and K each per 10a. The saponin content was higher in 5-years old roots than in 1-year old ones, and in purple flowered plant than in white flowered. The saponin contents in Chinese bellflower plant were higher compared with two related species, namely Codonopsis and Adenophora.
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