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A Southern View

Crop Observations from Southern Illinois
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Drought and Herbicide Carryover Questions

Posted by Robert Bellm -

One question growers keep asking is "What effect will this summer's drought have on the potential for herbicide carryover?" Sometimes the question is related to the potential for injury to this fall's wheat seeding, and sometimes it is related to the potential for injury to next spring's soybean or corn crop.

Although herbicide labels normally state a "rotational interval," (the length of time between when a herbicide is applied to a labeled crop before a non-labeled crop can be planted in the treated area) these rotational intervals are based upon typical growing seasons and environmental conditions. Application timing, drought, soil type, and herbicide chemistry can all affect the persistence of a herbicide and its potential to carry over and damage the next crop. These effects are all discussed in a recent Bulletin article written by Dr. Aaron Hager.

In an effort to gain real world data on herbicide carryover, the University's weed science group is conducting field bioassays both here at the Brownstown Agronomy Research Center, and at the Orr Agricultural Research Center near Perry, Illinois. At each location, the drought damaged corn in this year's corn herbicide research plots was shredded down this week (photo above), and soybeans and wheat drilled perpendicular to each set of herbicide treatments. Approximately 20 different corn herbicide treatments are being compared, as well as differences in rainfall and soil types between the two sites. Over the next several weeks, it will be interesting to see how things progress.

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