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A proposal to standardize soil/solution herbicide distribution coefficients

Published online by Cambridge University Press:  20 January 2017

Jerome B. Weber*
Affiliation:
Crop Science Department, North Carolina State University, Raleigh, NC 27695
Gail G. Wilkerson
Affiliation:
Crop Science Department, North Carolina State University, Raleigh, NC 27695
H. Michael Linker
Affiliation:
Crop Science Department, North Carolina State University, Raleigh, NC 27695
John W. Wilcut
Affiliation:
Crop Science Department, North Carolina State University, Raleigh, NC 27695
Ross B. Leidy
Affiliation:
Toxicology Department, North Carolina State University, Raleigh, NC 27695
Scott Senseman
Affiliation:
Soil and Crop Sciences Department, Texas A&M University, College Station, TX 77843
William W. Witt
Affiliation:
Agronomy Department, University of Kentucky, Lexington, KY 40546
Michael Barrett
Affiliation:
Agronomy Department, University of Kentucky, Lexington, KY 40546
William K. Vencill
Affiliation:
Crop/Soils Department, University of Georgia, Athens, GA 30602
David R. Shaw
Affiliation:
Plant and Soil Sciences Department, Mississippi State University, Mississippi State, MS 39762
Thomas C. Mueller
Affiliation:
Agronomy Department, University of Tennessee, Knoxville, TN 37901
Donnie K. Miller
Affiliation:
NE Research Station, Louisiana State University, St. Joseph, LA 71366
Barry J. Brecke
Affiliation:
W. Florida Research and Education Center, University of Florida, Jay, FL 32565
Ronald E. Talbert
Affiliation:
Agronomy Department, University of Arkansas, Fayetteville, AR 72704
Thomas F. Peeper
Affiliation:
Plant and Soil Sciences Department, Oklahoma State University, Stillwater, OK 74704
*
12 Corresponding author.

Abstract

Herbicide soil/solution distribution coefficients (Kd) 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 (Koc) has become a common parameter for comparing herbicide binding in soil; however, because OM and OC determinations vary greatly between methods and laboratories, Koc values may vary greatly. This proposal discusses this issue and offers suggestions for obtaining the most accurate Kd, Freundlich constant (Kf), and Koc values for herbicides listed in the WSSA Herbicide Handbook and Supplement.

Information

Type
Research Article
Copyright
Copyright © Weed Science Society of America 

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