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Microbial Degradation of Five Substituted Urea Herbicides

Published online by Cambridge University Press:  12 June 2017

Don S. Murray ,
Walter L. Rieck  and
J. Q. Lynd
Don S. Murray
Affiliation:
Oklahoma Agr. Exp. Sta., Stillwater, Oklahoma, Journal Article 1700
Walter L. Rieck
Affiliation:
Oklahoma Agr. Exp. Sta., Stillwater, Oklahoma, Journal Article 1700
J. Q. Lynd
Affiliation:
Oklahoma Agr. Exp. Sta., Stillwater, Oklahoma, Journal Article 1700
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Abstract

Phytotoxicity of five substituted urea herbicides 3-(3,4-dichlorophenyl)-1,1-dimethylurea (diuron), 3-(p-chlorophenyl)-1,1-dimethylurea (monuron), 3-phenyl-1,1-dimethylurea (fenuron), 3-hexahydro-4,7-methanoindan-5-yl) −1,1-dimethylurea (norea), and 3-(m-trifluoromethylphenyl)-1,1-dimethylurea (fluometuron) at 0, 10, 100, and 1000 ppm were determined in factorial combination at four urea nitrogen levels of 0, 45, 450, and 900 ppm with three Aspergilli: A. niger, A. sydowi, and A. tamarii. Response interactions were apparent, with all three fungi most tolerant for fenuron and least for diuron. Apparent tolerance order of the three intermediates were: A. niger, norea > fluometuron > monuron; A. sydowi, fluometuron > monuron > norea; and A. tamarii, fluometuron > norea > monuron. Oat (Avena sativa L.) bioassay for residual herbicide toxicity indicated significant differences in herbicide degradation rates between these three fungi at 5, 10, and 20 ppm in Eufaula sand. Diuron was more rapidly degraded than monuron at these levels with fluometuron and norea somewhat intermediate. A. niger was most effective in degradation of these herbicides with A. tamarii greater than A. sydowi. High nitrogen levels in soil organic matter amendment generally favored increased rates of urea herbicide degradation.

Type
Research Article
Information
Weed Science , Volume 17 , Issue 1 , January 1969 , pp. 52 - 55
Copyright
Copyright © 1969 Weed Science Society of America 

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References

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