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Published in J Environ Qual 7:233-236 (1978)
© 1978 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Persistence of Tebuthiuron in Surface Runoff Water, Soil, and Vegetation in the Texas Blacklands Prairie1

R. W. Bovey2, E. Burnett2, R. E. Meyer2, C. Richardson2 and A. Loh3

ABSTRACT

The concentration of tebuthiuron (N-[5-(1,1-dimethylethyl)-1,3,4-thiadiazol-2-yl)-N,N'-dimethylurea) applied in the spray or pellet form was measured in surface runoff water from watersheds which received natural or simulated rainfall. The persistence of tebuthluron in soil and vegetation was also investigated.

Pelleted tebuthiuron was applied at 2.24 kg/ha (active ingredient) to a 1.3-ha rangeland watershed. A 2.8-cm rain, 2 days after application, produced 0.94 cm runoff which contained an average of 2.2 ppm of tebuthiuron. Tebuthiuron concentration decreased rapidly with each subsequent runoff event and after 3 mo was <0.05 ppm; none was detected in runoff water 1 year after treatment. The concentration of tebuthiuron, applied as a spray at 1.12 kg/ha, decreased to <0.01 ppm within 4 mo in runoff from a small plot which received simulated rainfall. On 0.6-ha plots, mean tebuthiuron (sprays and granules) concentration was 0.50 ppm or less in water when the first runoff event occurred 2 mo after application. Concentrations of tebuthiuron in soil and grass from pellet applications were low (<1 ppm) and decreased with time.

Key Words: herbicides • residues • water quality

NOTES

1 Contribution from Oklahoma-Texas Area, Southern Region, USDA-ARS, in cooperation with Texas Agric. Exp. Stn., Texas A&M Univ., College Station, TX 77843.

2 Agronomist, Soil Scientist, Plant Physiologist, and Agricultural Engineer, respectively, USDA-ARS, College Station, and Temple, Tex.

3 Senior Analytical Chemist, Lilly Res. Lab., Greenfield, Ind.

Received for publication July 26, 1977.




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The SCI Journals Agronomy Journal Crop Science
Journal of Natural Resources
and Life Sciences Education		 Vadose Zone Journal
Soil Science Society of America Journal Journal of Plant Registrations The Plant Genome
Copyright © 1978 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.