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Optimum Ratio of $NO_3^-$ to $NH_4^+$ in Nutrient Solution for the Growth of Phalaenopsis Hybrid  

Lee, Young-Ran (Floriculture Research Division, National Institute of Horticultural & Herbal Science)
Lee, Yong-Beom (Department of Environmental Horticulture, University of Seoul)
Yae, Byeong-Woo (Floriculture Research Division, National Institute of Horticultural & Herbal Science)
Lee, Dong-Soo (Floriculture Research Division, National Institute of Horticultural & Herbal Science)
Publication Information
Journal of Bio-Environment Control / v.19, no.4, 2010 , pp. 229-233 More about this Journal
Abstract
This experiment was carried out to find optimum ratio of $NO_3^-$ to $NH_4^+$ in nutrient solution for the growth of Phalaenopsis hybrid and find the effect of the ratio of $NO_3^-$ to $NH_4^+$ on the flower stem (inflorescence) quality. The ratio of $NO_3^-$ to $NH_4^+$ of nutrient solution used in this experiment was 100% : 0%, 90% : 10%, 80% : 20% and 70% : 30%. Phalaenopsis showed better growth when $NH_4^+$ was supplied concurrently with $NO_3^-$ as nitrogen source than supplied with only $NO_3^-$. Especially, increasing the ratio of $NH_4^+$ from 0% to 10% the fresh weight and dry weight of Phalaenopsis hybrid was highest. But, the growth of shoot and root was diminished when the proportion of $NH_4^+$ in nutrient solution was increased from 10% to 30%. Inflorescence length, the number of inflorescence and flower per plant all increased as $NH_4^+$ increased from 0% to 10% but, decreased from 10% to 30%. These results suggest that the optimal ratio of $NO_3^-$ and $NH_4^+$ in nutrient solution for the growth of Phalaenopsis including inflorescence was founded to be 90%:10%.
Keywords
$CO_2$ uptake; dry weight; fresh weight; inflorescence; mineral content;
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