CORN Newsletter: 2006-22, July 18, 2006

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C.O.R.N Newsletter 2006-22
July 18, 2006 - July 25, 2006

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Wheat Varieties Suitable for 15-inch Rows and for Relay Intercropping
by Jim Beuerlein, Rich Minyo


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Some Ohio wheat producers are interested in producing soft red winter wheat in 15-inch rows which allows them to remove a grain drill from their machinery inventory and because production in wide rows reduces their seed cost by half. Other producers are interested in wide rows for the purpose of relay intercropping soybeans. We have evaluated wheat varieties in 15-inch rows for several years and have learned that some varieties will produce about as much yield in 15-inch rows as in narrow rows. For example, in 2001 six of 23 varieties produced a yield between 99 percent and 105 percent of the yield in 7.5-inch rows. That capability is due primarily to their growth habit, i.e. plant height and erectness of growth. Varieties with medium height and a very erect growth habit are needed for relay cropping and tall varieties with a non-erect growth habit perform well in 15-inch rows where intercropping is not planned.

We evaluated 55 varieties that were entered in the 2006 Ohio Wheat Performance Trial for height and growth habit and developed two lists; one list is of varieties that appear to be ideally suited for relay intercropping, and the second is for varieties that seem to be ideally suited for 15-inch row
production. Height measurements and growth habit ratings were made on each of the 55 varieties at each of five test sites and the data combined so we could select the appropriate varieties for each list. As seen in the following tables, only seven of the 55 varieties were found to be suitable for relay
intercropping and another 14 were found to be suitable for wide-row production. For wide-row production, wheat should be planted as soon as possible after the fly safe date, and the most profitable seeding rate is 20-25 seeds per foot of row. An application of 30 pounds of Nitrogen should be made at planting.

Table 1: Wheat varieties suitable for wide -row production

Brand	Variety
Public Certified	Freedom
Public Certified	Truman
Seed Consultants	SC 1343
Ebberts	518
Steyer	McLane
Pioneer Brand	25R63
Public Certified	Cecil
Seed Consultants	SC 1337
Steyer	Wise
Public Certified	Bess
Vigoro	V9512
AgriPro COKER	Coker 9553
Wellman	W 131
Beck	122

Table 2: Wheat varieties suitable for relay cropping

Brand	Variety
Public Certified	Roane
Public Certified	Hopewell
Buckeye	Parker
Wellman	W 141
AgriPro COKER	AgriPro Cooper
AgriPro COKER	Coker 9436
VA. Tech.	McCormick

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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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