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Adsorption and Degradation of Chlorbromuron in Soil

Published online by Cambridge University Press:  12 June 2017

K. E. Savage
K. E. Savage*
Affiliation:
Southern Weed Sci. Res. Lab., Agr. Res. Ser., U.S. Dep. Agr., Stoneville, MS 38776
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Abstract

The adsorption-desorption equilibria of chlorbromuron [3-(4-bromo-3-chlorophenyl)-1-methoxy-1-methylurea] in soil conformed to the Freundlich equation. Values of the constants, k and n, ranged from 4.2 to 12.3 and from 1.2 to 2.5, respectively, in eight soils. No significant linear correlation was detected between the Freundlich k values and soil texture, organic-matter content, pH, or water-holding capacity. Degradation studies were conducted using 14C-carbonyl-radiolabeled chlorbromuron in soil incubated at 18 or 32 C, with and without prior autoclaving, and with and without glucose enrichment. Degradation was enhanced by the higher temperature and glucose amendment, and it was retarded by autoclaving. Thin-layer chromatography indicated no accumulation of the monomethyl or monomethoxy derivative of chlorbromuron in any of the treatments. Chlorbromuron degraded rapidly in the incubation studies. Rapid loss of phytotoxicity was also noted in a greenhouse study with cucumber (cucumis sativus L. ‘Explorer’) bioassay. Phytotoxicity from 4 ppmw chlorbromuron had diminished to a very low level after 12 weeks.

Type
Research Article
Information
Weed Science , Volume 21 , Issue 5 , September 1973 , pp. 416 - 420
Copyright
Copyright © 1973 Weed Science Society of America 

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References

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