By Ryan Miller and Lisa Behnken
Earlier this spring we shared a couple videos on the lessons
we have learned from corn herbicide research at Rochester, MN. Now we would like to share what we have
learned about the value of preemergence herbicides in soybean. See or video Soybean Preemergence Herbicides: Always Have One Down https://youtu.be/o5z-FXrW8y0
We are back in the research plots in Rochester, checking-in
to see what we have been learning with our soybean herbicide research
plots. During the past couple of weeks,
we shared information on the “reach-back” potential of several preemergence
corn herbicide products. In our soybean
plots, we experienced similar weather conditions with a lack of rainfall after
the applications of preemergence herbicides.
With that lack of rainfall, the herbicides were slow to activate and we
saw an initial flush of weeds emerge, but unlike some of our corn herbicides
the soybean preemergence products did not exhibit “reach-back”. Not to worry, the preemergence herbicides
have now activated and are “reaching forward”.
We see that the herbicides are now helping to control future flushes of
small seeded broadleaves and grasses, reducing the overall weed pressure. In addition, they have widened the window of postemergence
herbicide application. Without a pre
down we needed our post emergence herbicide applications to go on four days
after soybean emergence, with pre’s down we had several weeks to get the post
applications on. We will be following
this trial during the 2017 growing season and providing periodic video updates.
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