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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 한국원예학회 HORTICULTURE ENVIRONMENT and BIOTECHNOLOGY HORTICULTURE ENVIRONMENT and BIOTECHNOLOGY Vol.48 No.1
- 발행연도
- 2007.2
- 수록면
- 52 - 59 (8page)
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초록· 키워드
오류제보하기
To determine the optimum N concentration and NO₃?:NH₄? ratio of nutrient solution for stock plant growth and cuttings production, Kalanchoe blossfeldiana ‘Margrethe’ plants were applied with nutrient solutions containing N at 6, 12, and 24 mM (6 N, 12 N, and 24 N) and NO₃?:NH₄? ratio (in mM) of 24:0, 20:4, 16:8, and 12:12 from 6 to 14 weeks after planting. High N promoted stock plant growth by increases in photosynthetic rate, stomatal conductance, and transpiration. High N application also increased chlorophyll and soluble protein contents and accumulated more assimilates in cuttings. High N application to stock plant increased the contents of not only N but also other macroelements except K in cuttings. Especially, the 24 N treatment increased the uptake of B, an important element for adventitious rooting. Cuttings from higher N-applied stock plant rooted more rapidly and had better growth at 3 weeks after cultivation. In NO₃?:NH₄? ratio experiment, stock plant growth was stimulated with increasing NH₄? ratio. The ratio of NO₃? to NH₄? of 16:8 significantly increased number of cuttings, leaf area, and fresh and dry weights. NO₃? and NH₄? contents increased with increasing NO₃? and NH₄? ratio, respectively. The content of P was lowest at the ratio of NO₃? to NH₄?of 24:0. However, cation contents in cuttings were higher with increasing NO₃? ratio. Higher NH₄?, at the ratios of NO₃? to NH₄? of 16:8 and 12:12, significantly increased total nonstructural carbohydrates and starch contents of cuttings. Total soluble protein and chlorophyll contents were higher at the ratio of NO₃? to NH₄? 16:8 than at the ratio of NO₃? to NH₄?of 24:0. After 21 days of cultivation, medium NO₃?:NH₄? ratios, 16:8 and 20:4, positively affected rooting and growth of cuttings, increasing leaf area, root fresh and dry weights, and shoot fresh and dry weights of cuttings. Whereas, top/root ratio was smallest at the ratios of NO₃? to NH₄? of 20:4 and 16:8, meaning that root growth was relatively better than shoot growth. However, the highest to NH₄? ratio, 12:12, negatively affected root growth of cuttings, although it somewhat promoted stock plant growth. In conclusion, we recommend to maintain N concentration at 24 mM with 16 mM NO₃? and 8 mM NH₄? for stock plant growth and cutting production in K. blossfeldiana ‘Margrethe’.
목차
Abstract
Introduction
Materials and Methods
Results and Discussion
Aknowledgements
Literature Cited
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