2017 OHIO CORN PERFORMANCE TEST

R.J. Minyo, A.B. Geyer, P.R. Thomison, Horticulture & Crop Science,
D.G. Lohnes, Information Technology
Ohio State University Extension/Ohio Agricultural Research & Development Center

Department of Horticulture and Crop Science Series 215, Ohio State University, Columbus, OH.

The purpose of the Ohio Corn Performance Test (OCPT) is to evaluate corn hybrids for grain yield and other important agronomic characteristics. Results of the test can assist farmers in selecting hybrids best suited to their farming operations and production environments. Corn hybrids differ considerably in yield potential, standability, maturity, and other agronomic characteristics that affect profitable crop production. Hybrid selection should be based on proven performance from multiple test locations and years. The presentation of data does not imply endorsement of any hybrid by The Ohio State University.

EVALUATION PROCEDURES

Seed companies marketing corn hybrids in Ohio are invited to enter hybrids in the test. An entry fee is charged to cover expenses. In 2017, companies were permitted to enter an unlimited number of hybrids. Ten sites were available for hybrid evaluation. Testing was available in three regions of Ohio (Southwestern/West Central/Central; Northwestern; North Central/ Northeastern). Companies were required to enter a hybrid at all the sites within a testing region. Each hybrid entry was evaluated using three replications per site in a randomized complete block design. Hybrids were planted either in an early or full season maturity trial based on relative maturity information provided by the companies. In the Southwestern/ West Central/Central region, the relative maturity of hybrid entries in the early maturity trial was 111 days or earlier; the relative maturity of hybrid entries in the full season trial was 112 days or later. In the Northwestern and North Central/Northeastern regions, the relative maturity of hybrid entries in the early maturity trial was 108 days or earlier; the relative maturity of hybrid entries in the full season trial was 109 days or later. Hybrids were planted with an Almaco Seed Pro 360 plot planter with SkyTrip GPS. Each plot consisted of four 30-inch rows approximately 25 feet long. Force 3G soil insecticide was applied in a T-band to all plots. Seed companies selected a final stand and percent overplant for each hybrid entered. Fertilizer, herbicides, insecticides and fungicides were applied according to recommended cultural practices for obtaining optimum grain yields. Details concerning the establishment and management of each 2017 test are listed in footnotes below the tables.

Soil Test / Fertilizer (N) P & K reported as lbs./acre.

MEASUREMENTS AND RECORDS

YIELD. The center two rows of each plot were harvested with a self propelled two row picker sheller combine. Yields were reported as bushels of grain per acre (Bu/A) at 15.5 percent moisture.

MOISTURE (HARV MST). A grain moisture determination was made from each plot with an electrical conductance moisture meter. Grain moisture was reported as percent grain moisture.

LODGING (STK LDG). The number of broken stalks in each plot was determined just prior to harvest. Only those plants with a stalk broken below the ear were considered stalk lodged. Stalk lodging was reported as a percentage of final plant stand.

FINAL STAND (FINAL STD). Seed corn producers selected a desired planting rate for each hybrid entered. Differences between the planting rate and the final stand may be attributed to seed quality and/or environmental conditions present. Populations were reported in hundreds (100/A) per acre.

EMERGENCE (EMG). An emergence count was made on each plot after plant emergence. The emergence percentage was computed based on the number of plants and the number of seed planted, and was reported as a percentage of the seeds planted.

TEST WEIGHT (TW). Test weights were recorded in pounds per bushel on grain samples at field moisture. The results are an average of all sites in the regional tests.

LSD 0.10 - Least Significant Differences at probability level 0.10 (LSD 0.10) are reported for yield and other agronomic characteristics. Differences between hybrids are significant only if they are equal to or greater than the LSD value. If a given hybrid out yields another hybrid by as much or more than the LSD value, then we are 90% confident (i.e. the odds are 10:1) that the yield difference is real, with only a 10% probability that the difference is due to chance variation (such as soil variation, etc.). For example, if Hybrid X is 19 Bu/A higher in yield than Hybrid Y, then this difference is statistically significant if the LSD is 19 Bu/A or less. If the LSD is 20 Bu/A or greater, then we are less confident that Hybrid X is really higher yielding than Hybrid Y under conditions of the test. If ‘NS’ is indicated for a characteristic, then the differences among hybrid entries are not significant at the 10% probability level.

2017 GROWING CONDITIONS

The 2017 Ohio growing season was characterized by one of the warmest springs on record (the month of April was the warmest on record). Precipitation at test sites in April was near normal but 1 to 4 inches above normal at most test sites in May and June. Temperatures in July were near normal but rainfall was considerably above normal at most sites especially those in Northwest, Southwest, West Central, and Central Ohio. Rainfall at the Hebron site was 12 inches above normal whereas that at Wooster it was slightly less than one inch above normal. The impact of drier than normal conditions in August and September were mitigated by below average temperatures. Foliar diseases and insect pests were generally not a major factor. However, rust, primarily common rust, was evident at several locations. Warm, dry conditions during the latter half of September through mid-October promoted crop maturation, which was important for late plantings and dry down, but persistent rains in November delayed harvest of late planted sites.

RESULTS

Results of the 2017 testing program are presented in Tables 1 to 10. The seed source and table location for hybrids tested in 2017 are shown in Table 11. The transgenic herbicide and insect resistant events and insecticide and fungicide seed treatments associated with each hybrid entry (information provided by seed companies) are indicated in Table 11. Hybrids that do not contain transgenic events are specified as “NON-GMO”. Yields and other agronomic performance characteristics have been averaged across the individual tests and shown under the SUMMARY heading for each region. Hybrids are listed in alphabetical order by brand.

Yields varied across the state depending planting delays and rainfall patterns. Averaged across hybrid entries in the early and full season tests, yields were 268 bu/A in the Southwestern/West Central/Central region, 235 bu/A in the Northwestern region, and 233 in the North Central/Northeastern region. Yields at individual test sites, averaged across hybrid entries in the early and full season tests, ranged from 195 bu/A at Hoytville to 283 bu/A at Hebron. Lodging was largely absent across sites except at Van Wert and Upper Sandusky where some hybrids lodged as a result of heavy rains and strong winds in early November. Performance data for Washington Court House in the SW region and Bucyrus (Full Season) in the NE region are not presented due to variable field conditions that resulted in erratic stands, uneven growth and inconsistent yields.

Confidence in test results increases with the number of years and the number of locations in which the hybrid was tested. Table 10 presents performance data for hybrids tested at 6 and 8 locations in 2017 and Tables 2, 3, 5, 6, 8 and 9 provide multiple year performance data. Look for consistency in a hybrid's performance across a range of environmental conditions. Yield, standability, grain moisture, and other comparisons should be made between hybrids of similar maturity to determine those best adapted to your farm. More detailed weather information including growing season rainfall and temperatures at each OCPT location will be available at this website.

All educational programs conducted by Ohio State University Extension are available to clientele on a nondiscriminatory basis without regard to race, color, creed, religion, sexual orientation, national origin, gender, age, disability or Vietnam era veteran status. Dr. Roger Rennekamp, Director, OSU Extension. TDD No. 800-589-8292 (Ohio only) or 614-292-1868

Acknowledgments: We thank our farmer cooperators for their contributions to the 2017 corn hybrid testing program. We are grateful for the assistance provided by Joe Davlin, OSU-OARDC Western Agricultural Research Station, Ken Scaife and Mike Sword, OSU-OARDC Wooster and Matt Davis, OSU-OARDC Northwest Agricultural Research Station. We thank Tim Bowman and Dave Scardena in Communications for their assistance in preparing the test results for publication.