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KMID : 0903619990400040470
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Journal of the Korean Society for Horticultural Science
1999 Volume.40 No. 4 p.470 ~ p.476
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Effect of Pruning, Pinching and Chilling Treatment on Flower Malformation and Rosette Formation of Gypsophila paniculata
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Abstract
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In order to inhibit rosette formation and flower malformation caused by high temperature in Gypspphila paniculata L., the effects of the pruning tune, pinching and the chilling treatment of perennial roof were investigated. As the pruning tune became later and the pinching treatment was added; blooming was delayed wind the length of flower stalk, node number, lst branch number, internode length arid cut-flower length increased, while the abnormal inflorescence and flower malformation rates decreased. The rosette formation rate in pinching on July 11 and in rio pinching on July 24 was 8.1% and 4.7%, respectively, which were lower than in any other treatment. The commercial yield was 4,209 bundles/10 a in the former treatment and 4,170 bundles/10 a in the latter. As the chilling period of perennial root at 2℃ lengthened and in chilling treatment after emergence than before emergence days to flowering were delayed. And the length of flower stalk, node number, 1st branch number and cut-flower length increased, but the abnormal inflorescence rate decreased. The flower malformation rate became much lower as the chilling period lengthened and in chilling treatment after emergence titan before emergence. The rosette formation rate was lowest (12.5%) at 6 weeks chilling treatment before emergence. In 6 weeks chilling treatment before emergence and after emergence, these commercial yields were 3,473 bundles/10 a and 3,414 bundles/10 a, respectively.
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