This study was designed to evaluate various treatments for control of horseweed in no-tillsoybean. The study was conducted on a silt loam soil with 2.0% organic matter and pH 6.8 at the BellevilleResearch Center. Fertilizer applied in 2003 was 50 and 200 lb/A P2O5 and K2O, respectively, to an areathat had been cropped to field corn in 2002. Asgrow brand ‘AG 4403' glyphosate-resistant soybean wasplanted 1.0 inch deep at 75 lb/A into a no-till seedbed on June 23. Plots consisted of four rows with 30inch row spacing, 21 ft long arranged in a randomized complete block design with three replications.Application timing was early preplant, 14 days before planned planting date (14EPP). The herbicides werebroadcast applied with a CO2 pressurized sprayer using 8002 flat fan tips at 40 PSI in 15 GPA water.Monthly rainfall in inches was 2.8, 4.8, 8.3, 1.9 and 4.2 in April, May, June, July and August, respectively.Weed population per 0.25 m2 in the nontreated plots, mid-season, was 2 horseweed and 1 commonragweed.
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