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Fluometuron adsorption to vegetative filter strip components

Published online by Cambridge University Press:  20 January 2017

S. Brooks Blanche ,
David R. Shaw ,
Joseph H. Massey ,
M. Boyette  and
M. Cade Smith
S. Brooks Blanche
Affiliation:
Department of Plant and Soil Sciences, Mississippi State University, Mississippi State, MS 39762
Joseph H. Massey
Affiliation:
Department of Plant and Soil Sciences, Mississippi State University, Mississippi State, MS 39762
M. Boyette
Affiliation:
Department of Plant and Soil Sciences, Mississippi State University, Mississippi State, MS 39762
M. Cade Smith
Affiliation:
Department of Plant and Soil Sciences, Mississippi State University, Mississippi State, MS 39762
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Abstract

Research on best management practices, including vegetative filter strips, is needed to evaluate the potential for reducing herbicides in surface runoff. Laboratory studies were conducted to determine the influence of different filter strip components on fluometuron adsorption. Samples were taken from a switchgrass filter strip (1-m wide) established on a Brooksville silty clay. Sampled components included switchgrass stems clipped to 4 cm, plant residue on the soil surface, and topsoil < 5-mm, 0.5- to 1-cm, 1- to 3-cm, and 3- to 5-cm deep. The filter strip topsoil samples contained 1.8, 2.2, 2.3, and 2.8% organic matter for the aforementioned depths, respectively, compared with 1.8% in soil collected from an adjacent cropped area. Fluometuron adsorption on each sample was compared at initial concentrations of 0.017, 0.5, 1.0, 2.0, and 4.0 mg L−1, the last of these representing four times the peak concentration in surface runoff. Fluometuron adsorption was greater in soil from filter strip areas than in soil from cropped areas. Averaged over concentration, the soil–water partition coefficient (Kd) value for soil 1- to 3-cm and 3- to 5-cm deep was greater than the value for soil from the cropped area. Stems and residue had Kd values 4.9- and 4.1-fold greater, respectively, than soil from the cropped area. Average adsorption coefficients normalized for organic carbon content (Koc) of soil < 5-mm and 3- to 5-cm deep from filter strip areas were greater than the values for soil from cropped areas.

Keywords

Fluometuronswitchgrass, Panicum virgatum L.Soil propertiesKd valuesorganic matter content
Type
Research Article
Information
Weed Science , Volume 51 , Issue 1 , February 2003 , pp. 125 - 129
Copyright
Copyright © Weed Science Society of America 

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