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Influence of soil properties and soil moisture on the efficacy of indaziflam and flumioxazin on Kochia scoparia

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dc.contributor.authorSebastian, Derek James, author
dc.contributor.authorWestra, Phil, advisor
dc.contributor.authorNissen, Scott, advisor
dc.contributor.authorShaner, Dale, committee member
dc.contributor.authorBarbarick, Ken, committee member
dc.date.accessioned2015-08-27T03:57:10Z
dc.date.available2015-08-27T03:57:10Z
dc.date.issued2015
dc.description.abstractIndaziflam and flumioxazin are two broad spectrum preemergence herbicides both labeled for control of kochia (Kochia scoparia L.). There is currently limited understanding of the significant effect of soil properties and soil moisture on the efficacy of these herbicides. Soil water retention curves were generated for soils with a wide range of soil physicochemical properties. The direct effect of soil moisture was then evaluated in a greenhouse bioassay. The dose required for 80 percent growth reduction (GR₈₀) for both herbicides showed correlations with percent organic matter and cation exchange capacity. Results from the linear regression analysis show the single best parameter explaining the highest proportion of variability in the GR₈₀ rates was soil organic matter (R² = 0.792 and 0.721) and CEC (R² = 0.599 and 0.354). There were two significant multiple regression models for indaziflam (R² = 0.914 and 0.901) and one for flumioxazin (R² = 0.814). As soil matric potential increased there was a significant effect of soil moisture on kochia percent dry weight reduction. Indaziflam and flumioxazin phytotoxicity was shown to be greatly reduced at -2 and -4 bars, and previous research has shown that kochia can germinate at moisture potentials greater than six times these values. The driving factors that were found to be correlated with this moisture effect was percent organic matter, CEC, percent sand, and percent clay. In these studies, kochia was found to germinate at moisture potentials below the moisture required for herbicide activation, and is likely why this weed is difficult to control with preemergence herbicides. There is a complex interaction between soil properties and soil moisture that influences kochia herbicide efficacy.
dc.format.mediumborn digital
dc.format.mediummasters theses
dc.identifierSebastian_colostate_0053N_12917.pdf
dc.identifier.urihttp://hdl.handle.net/10217/166954
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado State University. Libraries
dc.relation.ispartof2000-2019
dc.rightsCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.
dc.subjectindaziflam
dc.subjectpreemergence
dc.subjectsoil properties
dc.subjectflumioxazin
dc.subjectsoil moisture
dc.subject.lcshKochia
dc.titleInfluence of soil properties and soil moisture on the efficacy of indaziflam and flumioxazin on Kochia scoparia
dc.typeText
dcterms.rights.dplaThis Item is protected by copyright and/or related rights (https://rightsstatements.org/vocab/InC/1.0/). You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
thesis.degree.disciplineBioagricultural Sciences and Pest Management
thesis.degree.grantorColorado State University
thesis.degree.levelMasters
thesis.degree.nameMaster of Science (M.S.)

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