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Influence of pH on Detoxication of Herbicides in Soil

Published online by Cambridge University Press:  12 June 2017

F. T. Corbin  and
R. P. Upchurch
F. T. Corbin
Affiliation:
North Carolina State University
R. P. Upchurch
Affiliation:
North Carolina State University Agricultural Division, Monsanto Co., St. Louis, Mo.
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Abstract

The influence of pH and incubation time on the detoxication of 11 herbicides incorporated into high organic matter soils was investigated. Five of the chemicals were detoxified at different rates at the various pH levels. Optimum pH levels for the detoxication of these chemicals were (a) pH 5.3 for 2-methoxy-3,6-dichlorobenzoic acid (dicamba) and 2,4-dichlorophenoxyacetic acid (2,4-D), (b) 6.5 for 2,2-dichloropropionic acid (dalapon) and 3-amino-1,2,4-triazole (amitrole), and (c) pH 7.5 for S-propyl dipropylthiocarbamate (vernolate).

Slow positive detoxication, without pH influence, was observed for 3-(3,4-dichlorophenyl)-1,1-dimethylurea (diuron) and 3-amino-2,5-dichlorobenzoic acid (amiben). No detectable detoxication was observed for 4-amino-2,5,6-trichloropicolinic acid (picloram), α,α,α-tri-fluoro-2,6-dinitro-N,N-dipropyl-p-toluidine (trifluralin), 5-bromo-3-isopropyl-6-methyluracil (isocil), or 2-methoxy-4,6-bis(isopropylamino)-s-triazine (prometone).

Type
Research Article
Information
Weeds , Volume 15 , Issue 4 , October 1967 , pp. 370 - 377
Copyright
Copyright © 1967 Weed Science Society of America 

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References

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