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; and
Valent, USA.
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.