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C.O.R.N Newsletter 2009-19
     June 23, 2009 - June 30, 2009


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Corn growth “exploding” in many Ohio fields
by Peter Thomison

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Last week corn “exploded” in growth across much of Ohio. Most corn has entered the phase of rapid growth and development which usually occurs about the six leaf collar stage (V6 stage). Favorable conditions (abundant rainfall and warm temperatures) are fueling this surge in corn growth. However, there is considerable variability in growth with early planted corn chest high or taller and late May/early June corn not yet knee high. In west central Ohio, most corn planted in late April is at or beyond V11 and corn planted in early June is at about V4. From V10 to tasseling, leaf collar emergence occurs rapidly with approximately one leaf exposed every 50 GDDs; so given the warm temperatures that often occur this time of year, a new leaf can appear every 2 days. By V6 or shortly thereafter, nodal roots are usually established, and by V10, these roots may be over a foot deep and approaching row middles.

There are also some other important processes occurring at this time. As early as the V4/V5 stage, ear shoot initiation is completed and the tassel is initiated on the top of the growing point. During the rapid phase of corn vegetative growth, ear yield components are being determined. Kernel row numbers per ear are generally established by V12. Kernel row numbers are usually less affected by environmental conditions than by genetic background. Corn hybrids characterized by "girthy" ears typically exhibit more kernel rows (about 18 or 20 rows) than hybrids with long tapering ears (about 14 or 16 rows). Determination of kernels per row (ear length) is usually complete about one week before silking (R1) or about the V17 stage. Unlike kernel rows per ear, kernels per row can be strongly influenced by environmental conditions, so the absence of drought stress conditions this year bodes well with regard to the potential number of kernels on developing ears.

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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