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C.O.R.N Newsletter 2008-40
     December 1, 2008 - December 16, 2008


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2008 Ohio Corn Performance Test: An Overview
by Peter Thomison, Rich Minyo, Allen Geyer, Bert Bishop, David Lohnes

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In 2008, 242 corn hybrids representing 33 commercial brands were evaluated in the Ohio Corn Performance Test. Testing was conducted in three regions of Ohio - Southwestern/West Central (SW/WC); Northwestern (NW); and North Central/Northeastern (NC/NE), with three test sites established within each region. Testing was also conducted at Coshocton, an area with high gray leaf spot incidence. Entries in the regional tests were planted in either an early or full season maturity trial. These test sites provided a range of growing conditions and production environments.

Environmental conditions varied greatly across Ohio during the 2008 growing season, especially with regard to the amount and distribution of precipitation. At most test sites, rainfall from planting through the mid to late vegetative stages of corn development was above normal. It was the wettest June on record in many areas of Ohio. Excessively wet soils in May and June limited early season root development and resulted in shallow root systems. Dry weather conditions persisted from the late vegetative stages through maturity at most sites. Water deficits were especially severe in the Northwestern region especially at the Hoytville test site. At other test sites, water stress was limited by timely rains and adequate soil moisture. On September 14, record high winds associated with hurricane Ike caused severe root and stalk lodging at the test sites in SW/WC region and at the Hoytville test site in NW region. Slower than normal crop development in parts of northern Ohio contributed to higher than normal harvest grain moisture at the Beloit and Bucyrus test sites. Disease and insect pests were not a significant factor at most test sites. However, the western corn rootworm variant was observed for the first time in the hybrid performance trial at S. Charleston (which followed soybean) and caused considerable root lodging among hybrids without the Bt rootworm resistance trait.

Although growing conditions were drier than normal during the grain fill period and stalk and root lodging was greater than normal, excellent yields were recorded at several test sites. Yields, averaged across hybrid entries, exceeded 200 bu/A at S. Charleston, Washington C.H. and Greenville in the SW/WC region, Bucyrus in the NC/NE region, and Coshocton.

Tables 1 and 2 provide an overview of 2008 hybrid performance in the early maturity and full season hybrid trials by region. Complete results are available online at: http://www.oardc.ohio-state.edu/corntrials/ and http://agcrops.osu.edu/~perf/ .
Averages for grain yield and other measures of agronomic performance are indicated for each region. In addition, the range in test sites averages is shown in parentheses.

Table 1. A regional overview of the early maturity 2008 Ohio Corn Performance Test.
Region Entries Grain Yield(Bu/A) Moisture(%) Lodging (%) Emergence(%) Final Stand(plants/A) Test Wt.(lbs/bu)
SW/WC 51 235 15.8 25 95 31000 58.6
range (201-258) (13.8-18.5) (3-82) (90-98) (28500-34100) (56.0-62.9)
NW 69 159 17.3 33 96 32900 58.3
range (142-183) (14.8-21.3) (3-73) (88-98) (27600-41000) (55.0-62.5)
NE/NC 56 193 19.7 14 96 31400 56.4
range (175-212) (14.8-24.2) (2-58) (88-99) (25900-40000) (52.0-60.1)


Table 2. A regional overview of the full season 2008 Ohio Corn Performance Test.
Region Entries Grain Yield(Bu/A) Moisture(%) Lodging (%) Emergence(%) Final Stand(plants/A) Test Wt.(lbs/bu)
SW/WC 67 230 17.1 31 95 31400 57.9
range (201-250) (14.7-20.1) (3-92) (88-98) (26600-36400) (54.1-60.7)
NW 87 156 18.7 41 96 32200 56.9
range (125-177) (16.2-22.8) (14-65) (89-100) (28400-36800) (53.4-61.3)
NE/NC 56 193 23.2 10 96 31200 53.8
range (156-212) (18.8-28.3) (1-78) (92-99) (27200-36800) (50.1-58.5)

Readers can subscribe electronically to this newsletter by signing up at http://agcrops.osu.edu/services/email.html. E-mail labarge.1@osu.edu if you have problems subscribing or no longer wish to receive this newsletter.

C.O.R.N. is a summary of crop observations, related information, and appropriate recommendations for Ohio Crop Producers and Industry. C.O.R.N. is produced by the Ohio State University Extension Agronomy Team, State Specialists at The Ohio State University and Ohio Agricultural Research and Development Center. C.O.R.N. Questions are directed to State Specialists, Extension Associates, and Agents associated with Ohio State University Extension and the Ohio Agricultural Research and Development Center at The Ohio State University.


Information presented above and where trade names are used, they are supplied with the understanding that no discrimination is intended and no endorsement by Ohio State University Extension is implied. Although every attempt is made to produce information that is complete, timely, and accurate, the pesticide user bears responsibility of consulting the pesticide label and adhering to those directions.

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.

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.

TDD # 1 (800) 589-8292 (Ohio only) or (614) 292-1868

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