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Losses of Diuron, Linuron, Fenac, and Trifluralin in Surface Drainage Water¹

ABSTRACT

Diruon [3-(3,4-dichlorophenyl)-1,1-dimethylurea], linuron [3-(3,4-dichlorophenyl)-1-methoxy-1-methylurea], fenac [(2,3,6-trichlorophenyl)acetic acid], and trifluralin (,,-trifluoro-2,6-dinitro- N,N-dipropyl-p-toluidine) were applied to plots designed for sampling surface runoff. Over a 3-year period, highest concentrations in runoff were usually associated with rainstorms that occurred soon after application. Maximum seasonal losses were < 0.12, 0.30, 2.90, and 0.05% of the applied diuron, linuron, fenac, and trifluralin, respectively. The data suggest that with proper use on agricultural land in the lower Mississippi River Valley these herbicides pose little threat to adjacent aquatic areas.

Key Words: herbicides • runoff • aquatic species

¹ Joint contribution from the Southern Region, Agricultural Research Service, USDA, and the Louisiana Agric. Exp. Sta., Baton Rouge, LA 70803

² Soil Scientist and Chemist, USDA, Baton Rouge, LA, respectively.

³ Formerly Associate Professor, Plant Pathology Department, Louisiana State University, now Superintendent, Northeast Louisiana Exp. Sta., St. Joseph, LA 71366.

Received for publication November 15, 1974.