research
was low and during the later part of perennials (Figure 1, page 26). On particular photoperiod required to photoperiod to prevent or accelerate
the seedling stage. For example, we some species, we’ve also identifi ed induce fl owering. With this infor- fl owering, whichever is desired.
provided HPS lighting to petunia the minimum number of days of a mation, growers can regulate the We have also performed several
seedlings at two intensities (low
[L], 20 foot-candles, or high [H],
630 foot-candles) from 6 a.m. to 10
p.m., when the outside light inten-
sity was less than 900 foot-candles.
When plugs received high light for
only one-third of the production
period (HLL, LHL or LLH, with
each letter representing nine days),
shoot mass was greatest when the
high HPS lighting was provided
during the last third (LLH) (Figure
3, page 30). Plant growth continued
to increase with an increase in the
duration of the lighting period.
In the past several years, we’ve
also identifi ed how DLI infl uences
fl owering and crop quality attri-
butes on about 35 seed-propagated
bedding plants. We have identifi ed
the “saturating DLI” with respect
to fl owering time, which is the DLI
beyond which more light has little
or no impact on timing of a partic-
ular species. This information has
been published in articles and is
being incorporated into the Virtual
Grower computer program devel-
oped by the USDA.
Photoperiod Research
Flowering of a number of orna-
mental crops is infl uenced by day
length. Our fl oriculture produc-
tion group has identifi ed the pho-
toperiodic fl owering response of
hundreds of crops, most of which
are tender or hardy herbaceous
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