CORN Newsletter: 2004-19, June 22, 2004

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C.O.R.N Newsletter 2004-19
June 22, 2004 - June 28, 2004

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Later Season N Applications for Corn
by Robert Mullen


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With all the rain that has fallen in the recent weeks, coinciding with the time most want to apply sidedress N, some fields have not received enough N to carry corn through to meet current yield potentials. The corn may be too tall now for conventional applicators, and so the question is “what do I do now?” The easiest answer would be the use of clearance spraying equipment, if it is available. Even if it is available, the ground may still be to wet to allow field activities.

Aerial application of urea may be a reality that some will have to face. If urea is applied over the top aerially, producers may want to stay away from the fields for a while. Some of the granules will get got in the whorl which is moist from all the rain and burning can occur. Does this burning hurt the crop’s yield potential? Probably not, but depending upon the rate of application it can look pretty ugly for about a about a week or so. The other concern with broadcast application of urea is N losses associated with the application. Nitrogen losses from broadcast applications can be significant, especially in no-till fields (greater than 20% in some cases). So if given the choice between aerial application and the use of a high clearance applicator, the high clearance applicator is probably the best choice from an efficiency standpoint. It will allow for dribble application of liquid N which is far less susceptible to loss. Obviously, economics must also be considered.

If faced with this decision consider all points. If the field is too wet for applicator traffic but the field does not look too N stressed, you may want to wait and allow the field to dry and make the application with a high clearance sprayer. If the field is obviously N stressed and it may not dry for a while, aerial application may need to be looked at more seriously. Research has shown that corn can respond to N application all the way up to tasseling and beyond. So even though you have missed the boat with earlier applications, the boat is not so far out into the harbor that you can not swim out to it (not yet anyway).

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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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