Show simple item record Donaghy, David Ian. en_US 2009-12-02T16:48:42Z 2009-12-02T16:48:42Z 1973 en_US
dc.identifier ocm72763791 en_US
dc.description.abstract The influence of three years of zero tillage on weed populations and crop response was studied at three locations in Southern Manitoba, The crops grown were wheat (Triticum aestivum L., cv. Manitou), barley (Hordeum vulgare L., cv. Conquest and cv. Paragon), flax (Linum usitatissimum L., cv. Noralta), and rapeseed (Brassica napus L. var. annua Koch cv. Target and cv. Turret). The crops were sown using a triple disc drill system. The weed growth at the time of seeding was controlled with 1,1'-dimethyl-4,4'-bipyridinium ion (paraquat) plus 6,7- dihydrodipyrido (1,2-a:2',1'-c) pyrazinediium ion (diquat) at 0.84 + 0.28 kg/ha, with paraquat plus (2,4-dichlorophenoxy) acetic acid (2,4-D) ester at 0.84 + 1.12 kg/ha, and with paraquat plus 3,5-dibromo-4-hydroxybenzonitrile (bronoxynil) and ((4-chloro-o-tolyl) oxy) acetic acid (MCPA) at 0.28 + 0.56 kg/ha. Annual weed populations were lower under zero tillage than under conventional tillage. The species which were reduced in number were Setaria viridis (L.) Beauv. (green foxtail),Avena fatua, L. (wild oats), Polygonum scabrum Moench (green smartweed), and Polygonum convolvulus L. (wild buckwheat). The perennial weeds, Agropyron repens (L.) Beauv. (quack grass) and Cirsium arvense (L.) Scop. (Canada thistle), presented problems under zero tillage. Other herbicide treatments which resulted in good weed control were paraquat at 0.28 kg/ha applied in a spray volume of 69 l/ha, 2-sec-butyl-4,6-dinitrophenol (dinoseb) at 4.48 and 8.97 kg/ha, and N-(phosphonomethyl) glycine (glyphosate) at 0.56 kg/ha. Paraquat at 0.28 kg/ha was more effective when applied in 69 l/ha spray volume than when applied in 138, 183, or 243 l/ha spray volume, and was more effective when applied in the evening than when applied in the morning. Dinoseb resulted in excellent weed control at the time of spraying and gave residual control of broad-leaved weeds, green foxtail, and wild oats, Wheat (cv. Neepawa), barley (cv. Conquest), and Avena sativa L. cv. Harmon (oats ) were tolerant to dinoseb at 8.97 kg/ha. Glyphosate at 0.56 kg/ha resulted in weed control equivalent to control from paraquat plus diquat at 0.84 + 0.28 kg/ha. More crop plants emerged under zero... en_US
dc.format.extent xvi, 193 leaves : en_US
dc.format.extent 9100046 bytes
dc.format.mimetype application/pdf
dc.language en en_US
dc.language.iso en_US
dc.rights The reproduction of this thesis has been made available by authority of the copyright owner solely for the purpose of private study and research, and may only be reproduced and copied as permitted by copyright laws or with express written authorization from the copyright owner. en_US
dc.rights info:eu-repo/semantics/openAccess
dc.title Zero tillage crop production in Manitoba en_US
dc.type info:eu-repo/semantics/doctoralThesis Plant Science en_US Doctor of Philosophy (Ph.D.) en_US

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