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Use of Empirical Equations to Describe Dissipation of Metribuzin and Pendimethalin

Published online by Cambridge University Press:  12 June 2017

Robert L. Zimdahl ,
Brian K. Cranmer  and
Walter W. Stroup
Robert L. Zimdahl
Affiliation:
Weed Res. Lab, Dep. Plant Pathol, and Weed Sci., Colorado State Univ., Ft. Collins, CO 80523
Brian K. Cranmer
Affiliation:
Weed Res. Lab, Dep. Plant Pathol, and Weed Sci., Colorado State Univ., Ft. Collins, CO 80523
Walter W. Stroup
Affiliation:
Dep. Biometry, Univ. Nebraska, Lincoln, NE 68583
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Abstract

Four equations were evaluated as predictors of the rate of herbicide dissipation in soil. A biexponential equation was superior to the first-order equation for metribuzin and pendimethalin dissipation under five moisture levels and three temperatures in laboratory and field studies. The Hoerl function, adapted in the course of this work, is also a good descriptor. The first-order equation predicts slower initial and more rapid later dissipation than actually occurs and these deficiencies are not shared by the biexponential or Hoerl equations. The first-order equation ignores small residues remaining late in the dissipation process. These residues are important from an environmental point of view and the Hoerl and biexponential equations are more capable of dealing with them.

Keywords

Metribuzin, 4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-onependimethalin, N-(1-ethylpropyl)-3,4-dimethyl-2,6-dinitrobenzenamineBiexponential equationfirst-order equationHoerl functionsoil moisturesoil temperature
Type
Soil, Air, and Water
Information
Weed Science , Volume 42 , Issue 2 , June 1994 , pp. 241 - 248
Copyright
Copyright © 1994 by the Weed Science Society of America 

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