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Propanil and TCAB Residues in Rice Soils

Published online by Cambridge University Press:  12 June 2017

P. C. Kearney ,
R. J. Smith Jr. ,
J. R. Plimmer  and
F. S. Guardia
P. C. Kearney
Affiliation:
Crops Research Division, Agr. Res. Serv., U. S. Dep. of Agr., Beltsville, Maryland
R. J. Smith Jr.
Affiliation:
Crops Research Division, Agr. Res. Serv., U. S. Dep. of Agr., Stuttgart, Arkansas
J. R. Plimmer
Affiliation:
Crops Research Division, Agr. Res. Serv., U. S. Dep. of Agr., Beltsville, Maryland
F. S. Guardia
Affiliation:
Crops Research Division, Agr. Res. Serv., U. S. Dep. of Agr., Beltsville, Maryland
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Abstract

We surveyed soils that produce rice (Oryza Sativa L.) at the University of Arkansas Rice Branch Experiment Station at Stuttgart, Arkansas, to determine whether residues of 3, 3′,4,4′-tetrachloroazobenzene (hereinafter referred to as TCAB) accumulated with repeated applications of 3′,4′-dichloropropionanilide (propanil). We sampled Crowley silt loam with known histories of propanil application to determine the effect of depth, rate, and time on TCAB formation. Propanil and TCAB were measured by electron capture gas chromatography. Low concentrations of TCAB (<0.2 ppm) generally were detected in the surface 0 to 10.1-cm layer of soil receiving applications of propanil at rates of 6.7 kg/ha. Concentration and occurrence of TCAB decreased with increasing time and depth in soil.

Type
Research Article
Information
Weed Science , Volume 18 , Issue 4 , July 1970 , pp. 464 - 466
Copyright
Copyright © 1970 Weed Science Society of America 

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References

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