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KMID : 1041219870290010001
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Journal of Sericultural and Entomological Science
1987 Volume.29 No. 1 p.1 ~ p.6
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Seasonal Changes of Chemical Components in Winter Buds of Several Mulberry Varieties
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李梡周/Lee, Won Chu
秦順德/權寧河/朴光駿/Jin, Sun Duk/Kwon, Young Ha/Park, Kwang Joon
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Abstract
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Changes in water content, dry weight, total nitrogen (T-N), P, K, Ca, Mg, B, Fe, Cu, Zn and Mn and death rate were studied in winter buds of mulberry trees. Winter buds of the early season varieties, Hongolbbong and Chongolbbong, (Morus alba Koioz) and midseason varieties, Kaeryangbbong and Chongilbbong, (Morus alba L.) were sampled every 7 days from February 28 to April 28, 1986. The results were as follows:
1. Water content was increased by 20% over the level of 45% in late February. The water content in Chongolbbong was the highest, whereas that in the rest of the varieties was nearly equal.
2. Dry weights of winter buds of the early varieties were always greater than those of midseason varieties. The dry weight of buds of early season varieties began to increase in late February and increased rapidly after April 18. There was no weight gain until April 12 in buds of midseason varieties, followed by a slow increase thereafter.
3. T-N, P, K, B, Fe, Cu and Zn concentration increased with time, Mn decreased, and Ca and Mg levels were constant.
4. T-N and Mn levels were higher and P, Ca, Fe and Cu lower in Hongolbbong than in the other varieties. T-N, Mg and Cu levels were lower in Chongolbbong.
5. The death rate of winter buds increased with the approach of the budding season. The rate was highest in Chongolbbong and lowest in Hongolbbong.
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