Submitted to: American Chemical Society Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 3/30/2006
Publication Date: 3/30/2006
Citation: Papiernik, S.K., Koskinen, W.C. 2006. Dissipation of the herbicide isoxaflutole in agricultural soils [abstract]. American Chemical Society. p. 71.
Technical Abstract: Isoxaflutole is a relatively new pre-emergence herbicide used in corn production. Isoxaflutole’s phytotoxic metabolite (DKN) has a low sorption coefficient and may be persistent in soil, indicating that this herbicide may have a tendency to contaminate water resources through leaching and runoff. Two-year field dissipation studies were conducted in three soil types (sandy loam, loam, and clay loam) in west central Minnesota to indicate the rate at which isoxaflutole/DKN dissipates under the relatively cool, wet soil conditions typical of the northern Corn Belt. Separate plots were treated with isoxaflutole and potassium bromide, a non-sorbed and non-degraded tracer. Soil cores were collected to 1-m depth and sectioned into 0-10, 10-20, 20-40, 40-60, and 60-100 cm increments; bromide or herbicide concentration was measured at each depth. Leaching of both tracer and herbicide beyond 40 cm was observed. These results will provide information for the development of best management practices for this herbicide.