Ohio Soybean Performance Trials 2008
James E. Beuerlein, Professor, Dept. of Horticulture &
Steve St. Martin, Professor, Dept. of Horticulture & Crop
Anne Dorrance, Associate Professor, Dept. of Plant Pathology
Chris D. Kroon Van Diest, Research Associate, Dept. of
Horticulture & Crop Science
Ohio State University
The Ohio State University, College of Food, Agriculture and Environmental
The purpose of the Ohio Soybean Performance Trials is to evaluate soybean varieties for yield,
and other agronomic characteristics. This evaluation gives soybean producers comparative
information for selecting the best varieties for their unique production systems.
METHOD OF CONDUCTING TRIALS
in trials. Entries in the Ohio Soybean Performance Trials are accepted if
the seed will be available to Ohio farmers for the planting season following
the trials. All 2008 entries were submitted voluntarily by seed companies
and the Ohio Seed Improvement Association. Entry fee charges were made per
entry and location.
Normal and Roundup Ready (RR) Test. The
same production, testing and evaluation techniques, except for weed control,
were used for Normal tests and Roundup Ready tests. The performance of Normal
entries and Roundup Ready entries is not comparable statistically because they
were not tested together and because different weed control programs were used
for the two tests.
FIELD PLOT DESIGN
The entries for each test site were planted in
a randomized complete-block design. Each entry was replicated four times and
planted in plots 40 ft. long and 5 ft. wide containing four rows seeded at
200,000 seeds per acre.
PRODUCTION PRACTICES AND RAINFALL
The production practices used at each location
are shown in Table 1 and 2008 rainfall is shown in Table 2.
Cultural Practices by Test Site
|Soil Test P(ppm)
|Soil Test K(ppm)
XL/Dual II/Roundup UltraMax
Canopy XL/Dual II/Roundup UltraMax
2008 Rainfall Data
MEASUREMENTS AND RECORDS
Relative maturity. Relative
maturity is a rating designed to account for all of the factors that affect maturity date and includes variety, planting date, weather, latitude and disease. Maturity is defined as the “95% brown pods” stage. A variety with a Relative Maturity rating of 3.5 will reach the 95% brown pod stage 5 days later than a variety with a rating of 3.0. All the varieties in a table were tested as a group, and their performance analyzed and reported for that group regardless of their 2008 relative maturity rating.
was not taken in 2008 due to the variable influence of drought on varieties of different maturities.
Lodging score. There
was no lodging in 2008 as varieties were only 50 to 80 percent of their usual
Seed size is reported as seeds per pound.
Protein and oil %
analysis was determined by near infrared transmittance technology. The test was
performed by the OSU Grain Quality Lab using a Tecator Infratec whole grain
analyzer calibrated with the Composition Systems Calibration developed at Iowa
State University and is reported at 13% moisture.
Phytophthora Resistance Genes.
Phytophthora resistance genes were determined using a hypocotyl inoculation
test. In this test, several races of Phytophthora are used to determine the
presence or absence of a particular Rps gene. The Rps genes (Rps1a, Rps1c, etc.)
detected in a variety are listed in Tables 3 8. “ND” indicates that the Rps
gene(s) could not be determined, and the variety has Rps6, Rps8 or a Rps gene
combination of either 1c+3a or 1k + 3a. “None” indicates no resistance genes
were detected. TBA indicates that this data will be added to the data
base when it becomes available.
Phytophthora Partial Resistance.
All varieties were evaluated for partial resistance. Partial resistance is a
multi genic characteristic that provides some level of protection against all
known races of Phytophthora. Ratings of 3.0 to 3.9 are considered high levels of
partial resistance and will provide good levels of control. Ratings of 4.0 to
5.0 are considered moderate and will allow some yield loss when environmental
conditions favor Phytophthora. Ratings over 5.0 indicate very little partial
resistance or protection against Phytophthora. For Ohio Producers with fields
with a history of Phytophthora root and stem, varieties should have a
combination of Rps genes plus partial resistance to Phytophthora for the best
protection. TBA indicates that this data will be added to the data base when it becomes available.
Yield. Each soybean
variety was harvested at a moisture content between 9 and 15 percent and yields
computed to bushels per acre at 13 percent moisture.
LSD. A Least
Significant Difference (LSD) for yield was computed for each maturity group.
LSD's are reported in bushels per acre at 13 percent moisture. Yields of two
varieties within a maturity group are significantly different 70% of the time if
their yields differ by more than the LSD value shown for that maturity group.
Inclusion of entries in the Ohio Soybean Performance Trials does not constitute an endorsement of a particular entry by the Ohio State University, Ohio Agricultural Research and Development Center, or the Ohio State University Extension.
This report can be found on the internet at:
and each column of data can be sorted
to aid the variety comparison and selection process.
Go to Ohio Crop
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State University Extension are available to clientele on a nondiscriminatory
basis without regard to race, color, creed, religion, sexual orientation,
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Issued in furtherance of Cooperative Extension work, Acts of May 8 and June
30, 1914, in cooperation with the U.S. Department of Agriculture, Keith L.
Smith, Director, Ohio State University Extension.