| Summary: | 碩士 === 國立臺灣大學 === 園藝學研究所 === 84 === This study was to investigate the growth habits and effects of day
/night temperature,light level and fertilizer concentration on the
growth and flowering in Oncidium ''Grower Ramsey''. It is a typical
sympodial epiphytic orchid that bears significant pseudobulbs.As
the new vegetative buds emergenced,meanwhile the latent buds on
the pseudobulb differenitates.The differentiation of latent buds
corrrlates to their node position on the pseudobulbs.Flower buds
usually emergence from the latent buds at 0-1 node and vegetative
buds usually emergence below flowering buds.Pseudobulbs are
important vegetative organs,storing nutrition and water.The
nutrition status of the plants played the key role in flowering,
and environmental factors also effect the growth and flowering.
The resuluts show the best temperature for the growth in Oncidium
''Grower Ramsey'' is 20-30C,while for the stalk emergence and
development is 20-25C.The vegetative buds emergence and
pseudobulbs enlargement of Oncidium ''Grower Ramsey'' shaded at 25%
,55%,and 90% increased with light intensity.Under 90% shading,
plants failed to flower.The optimal shading level for flowering
was at 55% shading.Under the moderate day/night temperature,
the fertilizers of different concentration had no siginificant
effects on the growth and flowering.
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