A proposal to standardize soil/solution herbicide distribution coefficients

Jerome B. Weber, Gail G. Wilkerson, H. Michael Linker, John W. Wilcut, Ross B. Leidy, Scott Senseman, William W. Witt, Michael Barrett, William K. Vencill, David R. Shaw, Thomas C. Mueller, Donnie K. Miller, Barry J. Brecke, Ronald E. Talbert, Thomas F. Peeper

Research output: Contribution to journalArticlepeer-review

38 Scopus citations


Herbicide soil/solution distribution coefficients (K(d)) are used in mathematical models to predict the movement of herbicides in soil and groundwater. Herbicides bind to various soil constituents to differing degrees. The universal soil colloid that binds most herbicides is organic matter (OM), however clay minerals (CM) and metallic hydrous oxides are more retentive for cationic, phosphoric, and arsenic acid compounds. Weakly basic herbicides bind to both organic and inorganic soil colloids. The soil organic carbon (OC) affinity coefficient (K(oc)) has become a common parameter for comparing herbicide binding in soil; however, because OM and OC determinations vary greatly between methods and laboratories, K(oc) values may vary greatly. This proposal discusses this issue and offers suggestions for obtaining the most accurate K(d), Freundlich constant (K(f)), and K(oc) values for herbicides listed in the WSSA Herbicide Handbook and Supplement.

Original languageEnglish
Pages (from-to)75-88
Number of pages14
JournalWeed Science
Issue number1
StatePublished - 2000

Bibliographical note

Copyright 2017 Elsevier B.V., All rights reserved.


  • Herbicide binding
  • Herbicide movement
  • Herbicide retention
  • Herbicide sorption
  • K(f)
  • K(oc)
  • Leaching potential
  • Y(d)

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Plant Science


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