Ohio Soybean Performance Trials 2010

Chris D. Kroon Van Diest, Research Associate, Dept. of Horticulture & Crop Science
Douglas Kroon Van Diest, Research Assistant, Dept. of Horticulture & Crop Science
Ohio State University Extension /OARDC
The Ohio State University, College of Food, Agriculture and Environmental Science

INTRODUCTION

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

Entries in trials. Performance of entries in the Ohio Soybean Performance Trials are published if seed will be available to Ohio Soybean producers for the following planting season. All 2010 entries were submitted voluntarily by seed companies and the Ohio Seed Improvement Association. Entry fee charges were made per entry and location.

Normal (including Liberty Link) (N) 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(including Liberty Link) 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 140,000 seeds per acre.

PRODUCTION PRACTICES AND RAINFALL

The production practices used at each location are shown in Table 1.

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. The varieties in each table were tested as a group, and their performance analyzed and reported for that group.

Lodging score. There was no lodging in 2010.

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. (Anne Dorrance, Professor, Plant Pathology): Seed for all of the entries during 2010 were treated. I received untreated sample seed Nov 16, 2010, and will begin testing in January. The reason for this delay is we are testing the repaired greenhouses at Wooster to assess the feasibility of evaluating the performance trials. When the samples are evaluated, it will be similar to the procedure described below.

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 3-11. 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.

Phytophthora Partial Resistance. All varieties were evaluated for partial resistance. Partial resistance is a multigenic 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 4.9 are considered moderate and will allow some yield loss when environmental conditions favor infection by Phytophthora. Ratings of 5.0 to 5.9 indicate low levels partial resistance or protection against Phytophthora. Ratings of 6.0 and greater indicate very low levels and severe yield losses will result when Phytophthora pressure is high. For fields with a history of Phytophthora root and stem rot, varieties should have a combination of both an Rps gene plus good partial resistance to provide the best protection.

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 as much as or more than the LSD value shown for that maturity group.

DATA USE

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: www.agcrops.osu.edu and each column of data can be sorted to aid the variety comparison and selection process.

11/2010
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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.