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Effects of $Ca^{2+}\;:\;K^+$ Ratio in Nutrient Solution on the Growth and Quality of Marjoram(Origanum majorana) and Oregano(Origanum vulgare) Grown in Hydroponic Culture  

Park, Kuen-Woo (Division of Bioscience and Technology, College of Life and Environmental Sciences, Korea University)
Na, Cheol-Wook (Division of Bioscience and Technology, College of Life and Environmental Sciences, Korea University)
Kang, Ho-Min (Division of Bioscience and Technology, College of Life and Environmental Sciences, Korea University)
Publication Information
Journal of Bio-Environment Control / v.12, no.4, 2003 , pp. 240-244 More about this Journal
Abstract
The purpose of this study was to investigate a proper $Ca^{2+}\;:\;K^+$ ratio in nutrient solution to produce marjoram and oregano by hydroponics. Two herbs were grown for 40 days with the $Ca^{2+}\;:\;K^+$ ratio of 3.5;13, 4.5:11(standard herb's nutrient solution), 5.5:9 and 6.5:7mM${\cdot}L^{-1}$ of herb's nutrient solution developed by European Vegetable R &D Center, Belgium. The ratio of 5.5:9, and 6.5:7 mM${\cdot}L^{-1}$ showed better results in growth of marjoram than other treatments. Vitamin C contents and amounts of esential oil were the highest in the ratio of 5.5:9 and 6.5:7, respectively. Inoregano, the growth and vitamin C contents were the highest in the ratio of 5.5:9 and 6.5:7 mM${\cdot}L^{-1}$, respectively. The content (%) and amount (mg/plant) of essential oil were the highest in the ratio of 6.5:7mM${\cdot}L^{-1}$. These results indicated that 5.5:9 and 6.5:7 mM${\cdot}L^{-1}$were proper $Ca^{2+}\;:\;K^+$ ratio of nutrient solution of marjoram and oregano, respectively, by hydropoinics.
Keywords
amount of essential oil; chlorophyll; essential oil content; herb; vitamin C;
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