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Soil Persistence of Tebuthiuron in the Claypan Resource Area of Texas

Published online by Cambridge University Press:  12 June 2017

Rodney W. Bovey ,
Robert E. Meyer  and
Hugo Hein Jr.
Rodney W. Bovey
Affiliation:
Agric. Res. Serv., U.S. Dep. Agric., Range Sci., Texas A&M Univ., College Station, TX 77843
Robert E. Meyer
Affiliation:
Agric. Res. Serv., U.S. Dep. Agric., Range Sci., Texas A&M Univ., College Station, TX 77843
Hugo Hein Jr.
Affiliation:
Agric. Res. Serv., U.S. Dep. Agric., Range Sci., Texas A&M Univ., College Station, TX 77843
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Abstract

Pelleted tebuthiuron {N-[5-(1,1-dimethylethyl)-1,3,4-thiadiazol-2-yl] -N,N′-dimethylurea} was applied aerially on duplicate plots at 2.2 and 4.4 kg/ha in spring, summer, fall, and winter of 1978 and 1979. Treatments were made near Bryan in the Claypan Resource Area of Texas on an area supporting a stand of mixed brush consisting mostly of oak (Quercus) species. Soils were sampled at eight locations in each plot at depths of 0 to 15 and 15 to 30 cm in March 1980. Bioassays using ‘Tamcot’ cotton (Gossypium hirsutum L.) and ‘Caddo’ wheat (Triticum aestivum L.) were done in the greenhouse to detect levels of tebuthiuron residues in the soil. A standard curve was developed to compare known concentrations of tebuthiuron to the unknown content from treated plots. Tebuthiuron persisted in all treated soils and ranged from 0.08 to 0.49 μg/g. Concentrations were usually greater in soil treated in 1979 than in 1978 and in soil treated with 4.4 kg/ha of tebuthiuron than 2.2 kg/ha. No consistent differences in tebuthiuron residues existed either between soil depths or among seasons of application using the bioassay.

Keywords

Triticum aestivum bioassayGossypium hirsutum bioassayherbicide residuebrush control
Type
Research Article
Information
Weed Science , Volume 30 , Issue 2 , March 1982 , pp. 140 - 144
Copyright
Copyright © Weed Science Society of America 

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References

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