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Soil Properties Influence SaflufenacilPhytotoxicity

Published online by Cambridge University Press:  20 January 2017

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

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Saflufenacil, a pyrimidinedione herbicide, is used for contact and residualbroadleaf weed control in various crops. Bioactivity of saflufenacil in soilwas tested in greenhouse and laboratory studies on 29 soils representing awide range of soil properties and geographic areas across the United States.A greenhouse bioassay method was developed using various concentrations ofsaflufenacil applied PPI to each soil. Whole canola plants were harvested 14d after treatment, and fresh and dry weights were recorded. Nonlinearregression analysis was used to determine the effective saflufenacil dosesfor 50% (ED50,), 80% (ED80), and 90% (ED90)inhibition of total plant fresh weight. Bioactivity of saflufenacil in soilwas strongly correlated to soil organic (R = 0.85) andhumic matter (R = 0.81), and less correlated to cationexchange capacity (R = 0.49) and sand content (R = −0.32). Stepwise regression analysis indicated thatorganic matter was the major soil constituent controlling bioactivity insoil 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 mayvary based on soil organic matter content and texture classification.

Information

Type
Soil, Air, and Water
Copyright
Copyright © Weed Science Society of America