ACKNOWLEDGMENTS
The
information contained in this publication is due to the efforts of many
people. Cooperators are indicated with each
graph and without their extra efforts the tests would have not been
possible. County agricultural agents are
an integral part of the on-farm tobacco testing program at the
The following companies provided support in the form
of materials and grants to support the research contained in this report; Bayer CropScience, Clays Seed, Inc; FMC
Corporation; F.W. Rickard Seed; Hydro Agri North
America; Newton Seed; Philip Morris, USA; SQM North America; Syngenta Crop
Protection; Valent, USA; and Workman Tobacco
Seed.
PROCEDURE
Test
plots are arranged in a randomized complete block design and each treatment is
replicated at least four times. The
general plot size is four rows wide by at least 25 feet long unless the
experiment requires extra area. The two
center rows are used for collection of data with outside rows used as border
rows. Four sticks are harvested out of
each plot in the experiment for yield determination. The four sticks are tagged with the same
individual number representing that plot and combined as a single crop. The tobacco is stripped into three or four
grades to determine treatment effects on the plant at different stalk
positions. Results are analyzed for
statistical difference and mean separation was by least significant difference
(LSD). A confidence level of 0.05 was
used and the LSD value is included on most of the graphs of means. LSD values are listed on the right side of
each yield graph where applicable and are color coded to match stalk positions
or other measurements. To determine
statistical differences mean differences must be greater than the LSD value to
be considered significant at a 95% confidence that the difference is due to
treatment effects.
SPECIAL
NOTES
The use of a variety or chemical in
a test does not imply endorsement. The
use of chemicals on an experimental basis, combinations of chemicals and
cultural practices used in experimental tests are not a recommendation of those
procedures. Labels should be checked and
an appropriate specialist consulted before recommendations are made. Chemicals used for certain tests are for
evaluation of application timing and do not imply that other chemicals labeled
for the same problem with similar efficacy would not produce similar
results. A variety, chemical or cultural
practice should never be condemned or praised based only on one test.
Chemicals used on an experimental
basis are in the test phase and may never be labeled for use in tobacco. These tests look for effectiveness and best
rates. A successful chemical trial does
not assure labeling of that chemical.
There are many factors that are considered before a particular chemical
is labeled for use.