research
experiments to determine the pros
and cons of different ways to deliver
long days with different lamp
types. Considerations include time
to fl ower, fl ower number, fl owering
uniformity, stem elongation and
operating costs to deliver the low-
intensity lighting. With advances
in light-emitting diode (LED) tech-
nology, we are planning to advance
our understanding of how light
quality (the color of light) infl u-
ences fl owering of ornamentals.
PGR Research
Regulation of plant height is
crops. PGRs are most commonly Figure 3. Performance of petunia cuttings
a recurring challenge in the pro-
used to inhibit stem elongation,
rooted under different DLI (Photo, right:
duction of many containerized
but responses depend in part on the
Ball Horticultural Company)
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