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- [22] STUDIES ON THE MEDIA FOR ORCHID SEED-GERMINATION .3. EFFECTS OF TOTAL IONIC CONCENTRATION, CATION-ANION RATIO, NH4+/NO3- RATIO, AND MINOR ELEMENTS ON THE GROWTH OF BLETILLA-STRIATA JOURNAL OF THE JAPANESE SOCIETY FOR HORTICULTURAL SCIENCE, 1979, 47 (04): : 524 - 536