Show simple item record McGregor, James Arthur en_US 2011-06-06T18:11:18Z 2011-06-06T18:11:18Z 1933-04-01T00:00:00Z en_US
dc.identifier ocm72792373 en_US
dc.description.abstract The control of weeds is one of the oldest and still one of the most important problems connected with agriculture. Because we have always had weeds with us, there is a tendency to accept the situation as inevitable and one of the necessary evils connected with farming, consequently no sufficient, general, and concerted effort is being made to overcome the great loss which they cause. Yet the weed fight is one of the standard routine operations on the farm, and it represents a large proportion of the labor necessary to produce crops. No other single feature of farming requires such universal and unceasing attention as do weeds. The annual loss caused by weeds is enormous. As yet only a small amount of work of a definite nature has been done relative to the loss incurred. The following work has been undertaken to ascertain in a limited way the extent of some of these losses. Barnes and Hopkins in experimental work conducted withh tanks found that weeds were responsible for the removal in the first half of the growing season of more than half of the moisture conserved during the previous twelve months' treatment. This loss of moisture was directly reflected in the following crop of Wheat by reducing the yield over 50%. Barnes and Hopkins in experiments at Swift Current found that the yield of grain must suffer if the grain plants are obliged to compete with weeds for moisture. Experiments to determine the competitive effect of weeds were carried out by intentionally planting weed seeds with grain. Seeds of Russian Thistle, Stinkweed and Tumbling Mustard were used. The results obtained show a very depressing effect on the yield of grain growing in competition with weeds as compared to the weed free area. Similar results were obtained when weeds were allowed to grow upon land to be summerfallowed. Barnes and Hopkins found that the yield of Wheat sown the second year on land on which weeds had previously been planted with the Wheat was very greatly reduced. On weedy plots the yield was less than 25% of that on clean stubble land, Tumbling Mustard appearing to depress the yield to a greater extent than Russian Thistle or Stinkweed... en_US
dc.format.extent 51 leaves : en_US
dc.format.extent 3963103 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 A study of losses due to weeds in several crop zones of Manitoba en_US
dc.type info:eu-repo/semantics/masterThesis
dc.type master thesis en_US Agriculture en_US Master of Science (M.Sc.) en_US
dc.description.note Spring 1933 en_US

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