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dc.contributor.advisorSchoenau, Jeffrey J. (Jeff)en_US
dc.contributor.advisorHolm, F. A. (Rick)en_US
dc.creatorGeisel, Bryce G. L.en_US
dc.date.accessioned2007-03-29T10:00:02Zen_US
dc.date.accessioned2013-01-04T04:27:29Z
dc.date.available2007-03-30T08:00:00Zen_US
dc.date.available2013-01-04T04:27:29Z
dc.date.created2007-03en_US
dc.date.issued2007-03-30en_US
dc.date.submittedMarch 2007en_US
dc.identifier.urihttp://hdl.handle.net/10388/etd-03292007-100002en_US
dc.description.abstractThe 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.en_US
dc.language.isoen_USen_US
dc.subjectenvironmental conditionsen_US
dc.subjectrecrop injuryen_US
dc.subjectsoil propertiesen_US
dc.subjectherbicide persistenceen_US
dc.subjectroot inhibition bioassayen_US
dc.subjectoriental mustarden_US
dc.subjectdose response modelsen_US
dc.titleThe phytotoxic effect of ALS inhibiting herbicide combinations in prairie soilsen_US
thesis.degree.departmentPlant Sciencesen_US
thesis.degree.disciplinePlant Sciencesen_US
thesis.degree.grantorUniversity of Saskatchewanen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Science (M.Sc.)en_US
dc.type.materialtexten_US
dc.type.genreThesisen_US
dc.contributor.committeeMemberShirtliffe, Steven J.en_US
dc.contributor.committeeMemberJohnson, E. N.en_US
dc.contributor.committeeMemberCoulman, Bruce E.en_US


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