Dry soil conditions in Illinois have encouraged
farmers to plant crops earlier than it is usually performed and spray them with
postemergence herbicides. Weed science specialists make a point that it is quite
an unusual procedure at this point of the season to spray such a high amount of
corn acres with the herbicides.
One of the side effects of applying the herbicides could be propelling the
large amounts of dust, coming from the dry soil, into the air. Such dust cloud,
reduces the activity of some
foliar-applied herbicides, including glyphosate. Greenhouse research conducted
in 2006 revealed that the control of nightshade species with glyphosate was
reduced once the dust covered leaves before or within 15 minutes from
glyphosate application. If the dust was deposited later than a quarter after
application, phytotoxicity was not reduced. Glyphosate easily adsorbs to soil colloids, no matter if they are
difused in the air or deposited on leaves of the targeted weeds. Had the
glyphosate been adsorbed, plant leaves are less likely to absorb it, which
results in reduced phytotoxicity.
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