FIELD MOBILITY OF FLUMETSULAM IN 3 MISSISSIPPI SOILS

Research was conducted in 1994 and 1995 to evaluate the field mobility of flumetsulam in three soils of varied texture and organic matter co ntent but constant pH (pH = 6.0 +/- 0.1). Flumetsulam was monitored to a depth of 122 cm at 28, 56, and 84 days after treatment (DAT). Flume tsulam concentrations were determined by cotton bioassay, with separat e standard curves for various soil-depth combinations. Following a pre emergence application of flumetsulam at 224 g ai ha(-1), the herbicide was primarily limited to the upper 8 cm of soil, regardless of soil t ype, year, or DAT. Exceptions to this typically occurred following sub stantial rainfall amounts early in the season. Beyond 28 DAT, no signi ficant concentrations of flumetsulam were detected below 15 cm. Result s from this research suggest that leaching is not a significant route of flumetsulam dissipation in the field.