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KMID : 0903619960370020304
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Journal of the Korean Society for Horticultural Science
1996 Volume.37 No. 2 p.304 ~ p.308
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Effect of Growth Temperature and Transplanting Time on Freezing Injury , Growth and Flowering of Pansy
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송천영/Song, Cheon Young
방창석/정순경/최종명/송정섭/송창훈/Bang, Chang Seok/Chung, Soon Kyung/Choi, Jong Myung/Song, Jeong Seob/Song, Chang Hoon
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Abstract
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The objectives of this research were to investigate freezing injury, growth and flowering of pansy (Viola tricolor L. var. hortensis DC.) as influenced by growth temperature and transplanting time. Three pansy cultivars (Macedonika, Rose Picotee, and Majestic Giant Yellow) were sown on September 28, 1994 and transplanted to 9-㎝ plastic pot on November 10, 1994. The pots were placed in unheated polyethylene film tunnel or in heated greenhouse maintained at 5℃ or higher. Visual ratings of freezing injury and growth characteristics were made.
Freezing injury of pansy seedlings grown in the unheated polyethylene film tunnel decreased as compared to those grown at the temperature of 5℃ or higher. The freezing injury was higher in cultivars with larger flower diameter, and when transplanting time was earlier during the period from February 20 to March 7. Pansys grown in unheated polyethylene tunnel had less number of flowers and leaves, and leaf area and fresh weight decreased than those grown at 5℃ or higher. However, the amount of crude protein and oil increased when grown in unheated polyethylene film tunnel.
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