factors in greenhouse had a significant effect on the flower quality of
Phalaenopsis. Each variety has its adequate environmental
factors, such as light quantity, day temperature and night temperature.
The effects of the environmental factors on the flower quality are
introduced as follows:
A. Stem length
If the temperature difference
between day and night at spiking stage is increase, the stem length is
lengthened. If the temperature difference is decrease, the stem length
is shortened. In Japan, the orchids markets prefer to pretty long stem
for big-white Phalaenopsis, the day and night temperature is set
In the Netherland, shorter stem can make the whole orchids being
shorter, the setting temperature for day and night is 20℃
Light quantity is an
important factor for the stem quality. If the light quantity is too low,
the stem will soften.
B. The position of the
bud at the stem
If the day
temperature is too high, the position of the first bud will be higher
and the intervals of buds are decreased. The lower light intensity
enhances the height of the first bud.
C. Numbers of branch
factor on the branch number is day temperature. If the day temperature
is too high, the branch numbers will decrease. Reducing the day
temperature could enhance the branch number.
D. Flower size
factor of flower size is day temperature. Higher day temperature reduces
the flower size. Lower day temperature could make larger size of
E. Flower number
factor for flower number is the night temperature. If the night
temperature is too high, the flower number will decrease. Conversely,
lower night temperature increases the flower number.
information could be used to modify the quality of orchids flower. For
example, if customers like to purchase Phalaenopsis with more flower
numbers and do not care about the flower size in 9cm pot. The day
temperature could increase 1-2℃
and night temperature could decrease 1-2
in the greenhouse at flowering stage.