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Soil Degradation of Two Phenyl Pyridazinone Herbicides

Published online by Cambridge University Press:  12 June 2017

P. R. Rahn  and
R. L. Zimdahl
P. R. Rahn
Affiliation:
Weed Res. Lab., Dep. of Bot. and Plant Pathol., Colorado State Univ., Fort Collins, CO. 80521
R. L. Zimdahl
Affiliation:
Weed Res. Lab., Dep. of Bot. and Plant Pathol., Colorado State Univ., Fort Collins, CO. 80521
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Abstract

Degradation of SAN 6706 [4-chloro-5-(dimethylamino)-2-(α,α,α-trifluoro-m-tolyl)-3(2H)-pyridazinone] and SAN 9789 [4-chloro-5-(methylamino)-2-(α,α,α-trifluoro-m-tolyl)-3 (2H)-pyridazinone] was studied in a sandy loam soil at temperatures of 5, 20, and 35 C. After 210 days of incubation 10, 80, and 97% of SAN 6706 had been dissipated from soil at 5, 20, and 35 C., respectively. SAN 6706 was converted to SAN 9789 and a demethylated metabolite in the soil. SAN 9789 was converted to the demethylated metabolite. It was difficult to differentiate between first and second-order kinetics in the degradation of these compounds. SAN 6706, at 20 and 35 C, had a half life of 50 and 9 days respectively, and an Arrhenius activation energy of 15.8 Kcal/mole. SAN 9789, at 20 and 35 C, had a half life of 270 and 70 days, respectively, and an activation energy of 11.8 Kcal/mole. The degradation of SAN 6706 was inhibited by a chloroform treatment, and microbiological degradation is suggested.

Type
Research Article
Information
Weed Science , Volume 21 , Issue 4 , July 1973 , pp. 314 - 317
Copyright
Copyright © 1973 Weed Science Society of America 

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References

Literature Cited

1. Burschel, P. and Freed, V. H. 1959. The decomposition of herbicides in soils. Weeds 7:157–161.Google Scholar
2. Daniels, F. and Albert, R. A. 1967. Physical chemistry, Third edition, John Wiley & Sons, Inc., New York. 767 p.Google Scholar
3. Hamaker, J. W. 1966. Mathematical prediction of cumulative levels of pesticides in soil. Pages 122–131 in Gould, Robert F., ed. Organic pesticides in the environment. American Chemical Society Publications, Washington, D.C. 309 p.Google Scholar
4. Hamaker, J. W., Youngson, C. R., and Goring, C. A. I. 1967. Prediction of the persistence and activity of Tordon herbicide in soils under field conditions. Down to Earth 23:30–36.Google Scholar
5. Hamaker, J. W., Youngson, C. R., and Goring, C. A. I. 1968. Rate of detoxification of 4-amino-3,5,6-trichloropicolinic acid in soil. Weed Res. 8:46–57.Google Scholar
6. Hance, R. J. and McKone, C. E. 1971. Effect of concentration on the decomposition rates in soil of atrazine, linuron, and picloram. Pestic. Sci. 2:31–34.Google Scholar
7. Hill, G. D., McGahen, J. W., Baker, H. M., Finnerty, D. W., and Bingeman, C. W. 1955. The fate of substituted urea herbicides in agricultural soils. Agron. J. 47:93–104.CrossRefGoogle Scholar
8. Zimdahl, R. L., Freed, V. H., Montgomery, M. L., and Furtick, W. R. 1970. The degradation of triazine and uracil herbicides in soil. Weed Res. 10:18–26.Google Scholar