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Fractionation of Residues of Pendimethalin, Trifluralin, and Oryzalin during Degradation in Soil

Published online by Cambridge University Press:  12 June 2017

James E. Nelson ,
William F. Meggitt  and
Donald Penner
James E. Nelson
Affiliation:
Dep. Plant Pathol., Seed and Weed Sci., Iowa State Univ., Ames, IA 50011
William F. Meggitt
Affiliation:
Pestic. Res. Ctr., Dep. Crop and Soil Sci., Michigan State Univ., E. Lansing, MI 48824
Donald Penner
Affiliation:
Pestic. Res. Ctr., Dep. Crop and Soil Sci., Michigan State Univ., E. Lansing, MI 48824
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Abstract

A sequential extraction procedure was developed to study the fate of pendimethalin [N- (1 -ethylpropyl) -3,4- dimethyl - 2,6 - dinitrobenzenamine], trifluralin (α,α,α -trifluoro - 2,6 - dinitro - N,N - dipropyl - p - toluidine), and oryzalin (3,5 -dinitro-N4,N4 -dipropylsulfanilamide) in soil over a 6 - month laboratory incubation period. The distinction of non - bound residues was based on an acidic - methanol extraction followed by an extraction with an acetone :H2O : HCl (95:4:1, v/v/v) solution and then extraction with 0.5 N NaOH with further fractionation of the NaOH extract by partial precipitation. After 6 months, soil - bound 14C-residues of pendimethalin, trifluralin, and oryzalin contained 15, 14, and 23%, respectively, of the radioactivity applied to non - sterilized soil. The proportion of bound radioactivity associated with each organic fraction was nearly identical for each herbicide; 46, 12, 12, and 30% was associated with the acetone:H2O:HCl-soluble, fulvic acid, humic acid, and humin organic fractions, respectively. Soil sterilization reduced herbicide degradation by 31% and radioactivity in the fulvic acid, humic acid, and humin organic fractions by approximately 50% during the 6-month period. Radioactivity in the acetone:H2O:HC1-soluble fraction was reduced less than 10% by soil sterilization.

Keywords

Organic matterherbicide residuessoil sterilization
Type
Research Article
Information
Weed Science , Volume 31 , Issue 1 , January 1983 , pp. 68 - 75
Copyright
Copyright © 1983 Weed Science Society of America 

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References

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