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Persistence and Movement of Diuron and 3,4-Dichloroaniline in an Orchard Soil

Published online by Cambridge University Press:  12 June 2017

S. U. Khan ,
P. B. Marriage  and
W. J. Saidak
S. U. Khan
Affiliation:
Res. Sci. Chem. and Biol. Res. Inst. Agric. Canada, Ottawa, Ontario K1A 0C6
P. B. Marriage
Affiliation:
Res. Sci. Res. Sta., Agric. Canada, Harrow, Ontario NOR 1G0
W. J. Saidak
Affiliation:
Res. Coord. Res. Branch, Agric. Canada, Ottawa, Ontario K1A 0C6
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Abstract

The movement and persistence of diuron [3-(3,4-dichlorophenyl)-1,1-dimethylurea] and its degradation product, 3,4-DCA (3,4-dichloraniline) were studied in an orchard soil which had received diuron annually at the rate of 4.5 kg/ha for 7 yr. Accumulation of residues was not observed at significant levels although carry-over of the herbicide occurred between years. The bulk of the herbicide residue was confined to the upper 15 cm of soil. The degradation rate of diuron generally followed first-order kinetics and the residual levels of diuron in the soil were highly phytotoxic to oat (Avena sativa L.) plants during the 3 yr after the last application. The levels of 3,4-DCA were low in all soil samples (< 21 ppb) and its relative distribution in the soil profile was similar to that of diuron.

Type
Research Article
Information
Weed Science , Volume 24 , Issue 6 , November 1976 , pp. 583 - 586
Copyright
Copyright © 1977 by the Weed Science Society of America 

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References

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