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Title: WHEN DOES POSTEMERGENCE HERBICIDE INJURY DECREASE YIELD OF SOYEAN?

Author
item ROREM, KENT - UNIV OF ILLINOIS
item Wax, Loyd
item BELOW, FREDERICK - UNIV OF ILLINOIS

Submitted to: Weed Science Society of America Meeting Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 3/15/2000
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Compared to other postemergence herbicide programs, glyphosate-resistant soybean plants do not show any visible injury symptoms when treated with glyphosate. However, the extent to which plant injury or lack of injury affects soybean yields is unclear. Thus, the objective of this research was to determine the impact of herbicide injury on soybean growth and yield. Field studies were conducted for three years (1997-1999) at three Illinois locations. Treatments included three post herbicides applied at two stages of plant development on early and a late planted soybean. The herbicides were applied at the label rates with recommended adjuvants and included: acifluorfen, imazethapyr and glyphosate. All plots were kept weed free to remove the weed competition factor. Plants were evaluated for visual injury and above ground biomass was taken. These data show that certain herbicides often cause noticeable soybean injury, but plants usually recover quickly with no apparent yield loss. Yields may be reduced, however, if environmental factors are not favorable for rapid plant recovery.