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dc.contributor.supervisor Stobbe, Elmer (Plant Science) en
dc.contributor.author Wilcox, Douglas Howard
dc.date.accessioned 2009-01-21T14:56:41Z
dc.date.available 2009-01-21T14:56:41Z
dc.date.issued 2009-01-21T14:56:41Z
dc.identifier.citation Wilcox, Douglas Howard, M.Sc., The University of Manitoba, May 1986, Biology and Control of Bromus pectinatus Thunb., 177pgs. en
dc.identifier.uri http://hdl.handle.net/1993/3122
dc.description.abstract Investigations into the biology and control of the annual grassy weed Bromus pectinatus Thunb. were conducted at the National Plant Breeding Station, Njoro, Kenya, from 1982 to 1984. Pot growth of B. pectinatus was influenced by soil type and microclimate, but not by seed origin. B. pectinatus was germinated and grown in amended and untreated soils ranging in pH from 3.05 to 8.13. Soils with a pH near 3 could not support growth or germination of B. pectinatus. B. pectinatus grew best on a soil of pH 6.55 and when soil pH influenced germination the optimum soil pH was 6.0. Exposure to light inhibited the germination of B. pectinatus seeds. Germination of B. pectinatus seed was most rapid at a 17 C temperature. Germination of dormant B. pectinatus seeds was enhanced by seed hull removal or pricking the lemma or removing the rachilla segment. Germination of B. pectinatus seed in the soil was unaffected by depth of burial, whereas, emergence was reduced to 35, 19, 11, 4 and 0% from depths of 0, 1, 2, 4 and 8 cm, respectively. There was a relationship between field emergence of B. pectinatus and the precipitation pattern. After-harvest germination of B. pectinatus seed indicated that there was an innate dormancy in hulled seed which persisted for 8 months. Field measurements were used to develop an equation which related yield loss in wheat with B, pectinatus infestation. Delayed sowing of wheat and barley into a B. pectinatus infested site resulted in yield reductions that were correlated with length of delay. Replacement series studies were conducted using varying proportions of wheat : B. pectinatus and rapeseed : B. pectinatus. Rapeseed / canola was unaffected by B. pectinatus interference. A spatial interference study determined that B. pectinatus interfers with wheat mainly above ground. The herbicides isoproturon, pendimethalin and oxadiazon were found to be ineffective against B. pectinatus, The herbicides triallate, chlorsulfuron, metribuzin, trifluralin and EPTC achieved limited control of B, pectinatus. Superior control of B. pectinatus was achieved using fluazifop-butyl at 0.25 kg/ha and fenthiaprop-ethyl at 0.12 kg/ha, in rapeseed / canola. en
dc.format.extent 16066888 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US
dc.rights info:eu-repo/semantics/openAccess
dc.subject weed en
dc.subject kenya en
dc.subject seed en
dc.subject soil en
dc.subject germination en
dc.subject competition en
dc.subject interference en
dc.subject light en
dc.subject pH en
dc.subject temperature en
dc.subject replacement en
dc.subject interference en
dc.subject herbicide en
dc.subject morphology en
dc.subject wheat en
dc.subject Bromus en
dc.subject pectinatus en
dc.subject Triticum en
dc.subject canola en
dc.subject Brassica en
dc.subject barley en
dc.subject morphology en
dc.title Biology and control of Bromus pectinatus Thunb en
dc.type info:eu-repo/semantics/masterThesis
dc.degree.discipline Plant Science en
dc.contributor.examiningcommittee Marshall, George (Plant Science) Robinson, Gordon (Botany) en
dc.degree.level Master of Science (M.Sc.) en
dc.description.note May 1986 en


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