Friday, June 1, 2012

How Dust Can Limit the Effectiveness of Herbicides

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.

No comments:

Post a Comment