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Soil Properties Influence Saflufenacil Phytotoxicity

Published online by Cambridge University Press:  20 January 2017

Travis W. Gannon ,
Adam C. Hixson ,
Kyle E. Keller ,
Jerome B. Weber ,
Stevan Z. Knezevic  and
Fred H. Yelverton
Travis W. Gannon*
Affiliation:
Department of Crop Science, NC State University, Raleigh, NC 27695
Adam C. Hixson
Affiliation:
BASF Corporation, 5303 CR 7360, Lubbock, TX 79424
Kyle E. Keller
Affiliation:
BASF Corporation, 26 Davis Drive, P.O. Box 13528, Research Triangle Park, NC 27709
Jerome B. Weber
Affiliation:
Department of Crop Science, NC State University, Raleigh, NC 27695
Stevan Z. Knezevic
Affiliation:
Department of Agronomy and Horticulture, University of Nebraska-Lincoln, 57905 866 Road, Concord, NE 68728
Fred H. Yelverton
Affiliation:
Department of Crop Science, NC State University, Raleigh, NC 27695
*
Corresponding author's E-mail: travis_gannon@ncsu.edu
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Abstract

Saflufenacil, a pyrimidinedione herbicide, is used for contact and residual broadleaf weed control in various crops. Bioactivity of saflufenacil in soil was tested in greenhouse and laboratory studies on 29 soils representing a wide range of soil properties and geographic areas across the United States. A greenhouse bioassay method was developed using various concentrations of saflufenacil applied PPI to each soil. Whole canola plants were harvested 14 d after treatment, and fresh and dry weights were recorded. Nonlinear regression analysis was used to determine the effective saflufenacil doses for 50% (ED50,), 80% (ED80), and 90% (ED90) inhibition of total plant fresh weight. Bioactivity of saflufenacil in soil was strongly correlated to soil organic (R = 0.85) and humic matter (R = 0.81), and less correlated to cation exchange capacity (R = 0.49) and sand content (R = −0.32). Stepwise regression analysis indicated that organic matter was the major soil constituent controlling bioactivity in soil and could be used to predict the bioactivity of saflufenacil. Saflufenacil phytotoxicity was found to be dependent on soil property; therefore, efficacy and crop tolerance from PRE and PPI applications may vary based on soil organic matter content and texture classification.

Keywords

Saflufenacilcanola, Brassica napus L.Bioactivitybioassaydose–response curveherbicidesoil organic mattersoil properties
Type
Soil, Air, and Water
Information
Weed Science , Volume 62 , Issue 4 , December 2014 , pp. 657 - 663
Copyright
Copyright © Weed Science Society of America 

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