Persistance and phytotoxicity of dinitroaniline herbicides in Manitoba soils

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dc.contributor.authorPritchard, Mervyn Kennethen_US
dc.date.accessioned2012-05-15T15:54:42Z
dc.date.available2012-05-15T15:54:42Z
dc.date.issued1976en_US
dc.degree.disciplinePlant Scienceen_US
dc.degree.levelMaster of Science (M.Sc.)en_US
dc.description.abstractThe persistence and phytotoxicities of trifluralin (a, a, a-trifluro-2, 6-dinitro-N-dipropyl-p-toluidine), profluralin (N-(cyclopropylmethyl) -a, a, a-trifluro-2, 6-dinitro-N-propyl-p-toluidine), fluchloralin (N-(2-chloroethyl)-2, 6-dintro-N-propyl-4-(trifluromethyl) aniline), and dinitramine (N4, N4 -diethyl -a, a, a-trifluro-3, 5-dinitrotoluene-2, 4-diamine) were compared in Manitoba soils. Analytical determinations and field bioassay results, one year after application of the chemicals on light soil, indicated the order of persistence as: profluralin > trifluralin > fluchloralin > dinitramine. On heavy soils, the order of dinitroaniline persistence was: profluralin > dinitramine > trifluralin > fluchloralin, one year after application of the chemicals. Organic matter increased persistence of trifluralin and fluchloralin while clay content increased persistence of profluralin and dinitramine. The phytotoxicities of dinitroanilines were: dinitramine > trifluralin > profluralin = fluchloralin. They phytotoxicites of all chemicals decreased with increased organic matter. Under low soil temperatures (4oC), trifluralin caused a greater inhibition of wild oat (Avena fatua L.) roots than the other chemicals while dinitramine and fluchloralin were the most phytotoxic herbicides at the higher temperatures (8oC). Root length was the best criterion for detection of dinitroaniline herbicide activity. Shoot growth was inhibited most by trifluralin at all temperatures tested but shoot dry weight was a poor indicator of herbicide injury.en_US
dc.format.extentix, 87 leaves.en_US
dc.identifierocm72797500en_US
dc.identifier.urihttp://hdl.handle.net/1993/6179
dc.language.isoengen_US
dc.rightsopen accessen_US
dc.titlePersistance and phytotoxicity of dinitroaniline herbicides in Manitoba soilsen_US
dc.typemaster thesisen_US
local.subject.manitobayesen_US
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