Evaluating cultural weed management techniques in soybean in Manitoba

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dc.contributor.authorRosset, Jonathan DDJ
dc.contributor.examiningcommitteeCattani, Douglas (Plant Science)en_US
dc.contributor.examiningcommitteeMarkham, John (Biological Sciences)en_US
dc.contributor.supervisorGulden, Robert (Plant Science)en_US
dc.date.accessioned2020-04-04T22:56:52Z
dc.date.available2020-04-04T22:56:52Z
dc.date.copyright2020-03-30
dc.date.issued2020-03-30en_US
dc.date.submitted2020-03-30T22:48:55Zen_US
dc.degree.disciplinePlant Scienceen_US
dc.degree.levelMaster of Science (M.Sc.)en_US
dc.description.abstractSoybean’s popularity as a rotational crop has increased in Manitoba and the Canadian Prairies due to its nitrogen-fixing capabilities and development of short-season cultivars genetically engineered to resist glyphosate. Appropriately designed cultural weed management techniques help mitigate the development of glyphosate resistant weed biotypes caused by excessive glyphosate applications. The cultural weed management techniques of row spacing, target density, and cultivar were evaluated to determine their effects on the critical weed free period in soybean and provide a framework for future regional recommendations. Three field experiments were implemented during the summers of 2016 and 2017 at three locations in southern Manitoba to examine the effects of (1) two row spacings, (2) three target densities, and (3) three soybean cultivars on the critical weed free period in soybean (chapter 3) and the structure of the associated resident weed community (chapter 4). Narrow row soybean shortened the critical weed free period by up to three development stages compared to wide rows. Soybean grown at a target density of 333,000 plants ha-1 lengthened the critical weed free period by up to two development stages compared to soybean grown at 666,000 plants ha-1. The effect of soybean cultivar was location dependent, however the cultivar with the shortest maturity and stature generally had the longest critical weed free period. A total of fourteen weed species were identified among field experiments, eight or less weed species occurred at individual site-years and these were dominated by fewer than three species. The structure and trajectories of the weed communities was affected overwhelmingly by the duration of the soybean weed free period. Soybean row spacing and target densities affected the trajectories of the weed community at the untreated and initial herbicide application stages. Further herbicide applications fully obscured the effects of the cultural techniques. Soybean cultivar did not influence the weed community. This research showed that soybean competitive ability can be improved by implementing specific cultural techniques that reduce the duration of time the crop must be kept weed free to minimize yield loss. Specific cultural techniques were also shown to influence the structure of the weed community.en_US
dc.description.noteMay 2020en_US
dc.identifier.citationRosset JD, Gulden RH (2020). Cultural weed management practices shorten the critical weed-free period for soybean grown in the Northern Great Plains. Weed Sci 68:79–91. DOI: 10.1017/wsc.2019.60en_US
dc.identifier.urihttp://hdl.handle.net/1993/34634
dc.language.isoengen_US
dc.rightsopen accessen_US
dc.subjectSoybeanen_US
dc.subjectWeed managementen_US
dc.subjectCritical weed free perioden_US
dc.subjectCompetitive abilityen_US
dc.subjectRow spacingen_US
dc.subjectStand densityen_US
dc.subjectSoybean cultivaren_US
dc.subjectWeed communityen_US
dc.subjectPrincipal component analysisen_US
dc.subjectNon-linear regressionen_US
dc.titleEvaluating cultural weed management techniques in soybean in Manitobaen_US
dc.typemaster thesisen_US
local.subject.manitobayesen_US
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