research
crop, environment, a product’s active
A Final Word
allied trade companies, and state all instances, projects are supported
ingredient, and the method, concen-
The research we perform is
and national competitive granting by multiple funding sources. As a
tration and volume of application.
funded by greenhouse growers,
agencies and endowments. In nearly result, industry funds are leveraged
For these reasons, successful appli-
cation of PGRs requires scientifi c
information as much as grower
skill, experience and intuition
about future crop growth. We’ve
performed a variety of experiments
with PGRs on a range of fl oriculture
crops during the young plant and
fi nish stages. Experiments have
focused on application methods
(spray versus drench or liner dip),
effi cacy of different products at dif-
ferent rates, as well as identifying
suggested starting rates for a par-
ticular product and crop. Summary
information with photographs of
representative plants in treatments
is available online at www.hrt.msu.
edu/fl oraoe/pgrinfo. We also work
with PGR manufacturers to help
evaluate experimental formula-
tions or new active ingredients.
Other PGR Research
Several PGRs are used for pur-
poses other than inhibiting stem
extension. For example, we have
identifi ed how benzyladenine (BA)
can be used to inhibit lower-leaf
chlorosis or, in a more crop-specifi c
case, promote fl owering of phalaen-
opsis orchids. We have also identi-
fi ed suggested rates of products
that contain gibberellic acid (GA),
such as Fresco (Fine Americas), to
overcome an overapplication of a
growth retardant. For example, fol-
lowing a 10-ppm spray of Piccolo
(an excessively high rate), as little as
a 2.5-ppm spray of Fresco overcame
the growth inhibition when applied
12 days later (Figure 4, page 32).
Recently, we have been per-
forming research to help determine
desirable application methods and
concentrations of abscisic acid to
improve the drought tolerance of
fl oriculture crops. If a product could
be applied that reduced plant water ®
loss, crops would remain turgid
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