Submitted to: Research Report North Central Weed Science Society United States
Publication Type: Other
Publication Acceptance Date: 12/18/1996
Publication Date: N/A
Citation: Interpretive Summary:
Technical Abstract: The purpose of this experiment was to compare various sequential herbicide programs for weed control in soybeans. The study was established at the University of Illinois South Farm, Urbana. The soil was a Flanagan silt loam with a pH of 6.2 and 5.3% organic matter. Pioneer 9394 soybeans were drilled 1.0 inches deep on May 20 in 30 inch rows. Treatments were arranged in randomized complete blocks with 3 replications of plots 10 by 36 feet. Herbicides were applied with a CO2 backpack sprayer delivering 20 gpa and equipped with 8003 flat fan nozzles for soil applications and 8002 flat fan nozzles for postemergence applications. Initial soybean injury was observed with the majority of herbicide treatments. With the exception of treatments containing lactofen, soybeans quickly outgrew the initial injury. Excellent rainfall for activation of soil applied herbicides followed by good growing conditions contributed to the excellent broad spectrum weed control provided by the majority of herbicide treatments. However, common lambsquarters control was lower with chlorimuron and lactofen or when NAF-75 was applied without thifensulfuron.