University of SaskatchewanHARVEST
  • Login
  • Submit Your Work
  • About
    • About HARVEST
    • Guidelines
    • Browse
      • All of HARVEST
      • Communities & Collections
      • By Issue Date
      • Authors
      • Titles
      • Subjects
      • This Collection
      • By Issue Date
      • Authors
      • Titles
      • Subjects
    • My Account
      • Login
      JavaScript is disabled for your browser. Some features of this site may not work without it.
      View Item 
      • HARVEST
      • Electronic Theses and Dissertations
      • Graduate Theses and Dissertations
      • View Item
      • HARVEST
      • Electronic Theses and Dissertations
      • Graduate Theses and Dissertations
      • View Item

      The phytotoxic effect of ALS inhibiting herbicide combinations in prairie soils

      Thumbnail
      View/Open
      BryceGeiselThesis.pdf (827.4Kb)
      Date
      2007-03-30
      Author
      Geisel, Bryce G. L.
      Type
      Thesis
      Degree Level
      Masters
      Metadata
      Show full item record
      Abstract
      The objective of this study was to determine if the presence of two ALS inhibiting herbicide residues in three Saskatchewan soils would result in an additive, synergistic, or antagonistic interaction. This was determined through field trials where herbicides were applied sequentially over the course of two years and through dose-response modelling. The herbicides examined in these experiments were imazamethabenz, flucarbazone-sodium, sulfosulfuron, and florasulam, each in combination with imazamox/imazethapyr. The phytotoxicity and persistence of the herbicides in soil was assessed using an Oriental mustard root inhibition bioassay. The determination of herbicide interaction was made through the comparison of the experimentally observed values to theoretically expected values derived from a mathematical equation.The dose response curves created by placing incremental concentrations of these herbicides in soil were compared using the I50 parameter, which is the concentration resulting in a 50% reduction in root length. It appeared that soil organic matter followed by soil pH had the greatest effect in reducing herbicide residue phytotoxicity in the tested soils. Based on the bioassay analysis of sequentially applied ALS inhibiting herbicides, it is proposed that the phytotoxic effect of herbicide residues in soil result in additive injury effects rather than synergistic or antagonistic interactions.
      Degree
      Master of Science (M.Sc.)
      Department
      Plant Sciences
      Program
      Plant Sciences
      Supervisor
      Schoenau, Jeffrey J. (Jeff); Holm, F. A. (Rick)
      Committee
      Shirtliffe, Steven J.; Johnson, E. N.; Coulman, Bruce E.
      Copyright Date
      March 2007
      URI
      http://hdl.handle.net/10388/etd-03292007-100002
      Subject
      environmental conditions
      recrop injury
      soil properties
      herbicide persistence
      root inhibition bioassay
      oriental mustard
      dose response models
      Collections
      • Graduate Theses and Dissertations
      University of Saskatchewan

      University Library

      The University of Saskatchewan's main campus is situated on Treaty 6 Territory and the Homeland of the Métis.

      © University of Saskatchewan
      Contact Us | Disclaimer | Privacy