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KMID : 0903619980390040469
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Journal of the Korean Society for Horticultural Science
1998 Volume.39 No. 4 p.469 ~ p.474
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Effects of Nitrogen - Phosporus - Potassium Ratios on the Growth and Mineral Content of Temperate Cymbidium
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Abstract
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Eight kinds of commercialized liquid or solid fertilizers with different ratio of NPK were employed to investigate the growth response and mineral content of shoots and roots with four kinds of temperate Cymbidium orchids. Each Cymbidium showed slightly different growth response, especially in terms of root growth, depending on the ratio of NPK. Shoot and root growth were favored when NPK ratio of liquid fertilizer was 5-10-5. But healthy and compact plants were observed when high content potassium fertilizer was applied. Plant height, number of shoots and leaves in Cym. goeringii and Cym. gyokuchin were not much influenced by kinds of fertilizer. However, there was significant difference in the growth and weight of shoots and roots as influenced by the kinds of fertilizer in Cym. kanran hybrid and Cym. neveo-marginatum. Leaf analysis showed that nitrogen content was the highest when ratio of liquid fertilizer was 30-10-10 and the lowest when that was 6-40-6. Potassium content was the highest among major mineral nutrients analyzed and higher content was observed in root than leaf tissue. Nitrogen content in leaf was higher than root in four kinds of Cymbidium, but phosphorus content in root was higher than leaf tissue only except Cym. goeringii. But we could not observe the synergistic and/or antagonistic effects among mineral elements by fertilizing different ratio of NPK.
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