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Title: RESPONSE OF FIFTEEN SOYBEAN VARIETIES TO V-53482 OR SULFENTRAZONE

Author
item LOVELL, SARAH - UNIV OF ILLINOIS
item WAX, LOYD

Submitted to: North Central Weed Science Society US Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 1/14/1999
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Sulfentrazone and V-53482 are inhibitors of protoporphyrinogen oxidase used for preemergence control of weeds in soybeans. Sulfentrazone has been shown to cause variety sensitive injury to soybeans under certain environmental conditions. The extent of soybean response is also dependent on soil factors such as pH, organic matter, and texture. Little work has been done to determine the potential for soybean injury with V-53482. Our objective was to compare soybean varieties for response to V-53482 or sulfentrazone and determine the effects on growth and yields. A greenhouse experiment was conducted using various rates of these herbicides and 15 selected soybean varieties. V-53482 caused less than 10% injury on all varieties at any rates. In contrast, sulfentrazone injury ranged from 5 to 62%, depending on the variety. In the field study, two varieties each of sulfentrazone-sensitive and sulfentrazone- tolerant soybeans were planted. Preemergence applications of three rates of each herbicide were made to each variety. Both herbicides caused a reduction in emergence and stand count at 21 days after emergence. Emergence count decreased with increasing rates of either herbicide for all varieties. Yield for one of the two sulfentrazone-sensitive varieties was adversely affected by the two higher rates of sulfentrazone or V-53482. However, at normal field use rates, injury did not cause a yield reduction with either herbicide on any of the varieties.