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KMID : 0903619840250030194
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Journal of the Korean Society for Horticultural Science
1984 Volume.25 No. 3 p.194 ~ p.200
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Physiological and Ecological Studies on the chinese Bellflower , Platycodon grandiflorum DC.)
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Abstract
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Experiments were conducted to study the effects of sowing time, planting methods, and planting densties on the growth and yield of Chinese bellflower, the results were summarized as follows:
1. Significantly better top and root growth were observed in plantings earlier than May 14. Plants of Chinese bellflower planted later than July 13 did not flower and showed poor growth, the optimum planting time of Chinese bellflower was appeared to be middle of April.
2. Seeds germinated immediately after sowing when sown on August 12 and September 12, but no plants survived the cold of the winter season. Sowing on October 11 emerged in the following spring and their growth was comparable to that of March 14 planting.
3. As the planting density was increased relative light intensity per plant was decreased. However relative light intensity per unit area was increased. Dry weight per root was heavier by 27.3% in the density of 200 plants/㎡ than in that of 300 plants/㎡. But the difference in dry weight per root did not much differ in the range of 300 to 600 plants/㎡.
4. Marketable root yield per unit area was increased as the planting density was increased up to 600 plants per ㎡.
5. Number of root branches were 3.1 and 6.3 per root in direct planting and transplanting, respectively, i.e. number of root branches was increased by transplanting.
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