Show simple item record Janke, Wilfred Edwin en_US 2011-06-06T18:10:59Z 2011-06-06T18:10:59Z 1957-04-01T00:00:00Z en_US
dc.identifier ocm72779454 en_US
dc.description.abstract Samples were taken from virgin and cultivated sites in each of three soil associations in the Black earth zone to study the effect of cultivation on available soil nitrogen. The investigations have shown that cultivation affected the organic matter, nitrogen content and nitrogen distribution in one of the soils to such and extent that rate of nitrification was reduced considerably. In the other two soils cultivation caused a smaller loss in organic matter and nitrogen content and even appeared to increase nitrification of the remaining nitrogen fraction. Field trials were conducted with ammonium sulphate and ammonium nitrate fertilizers on barley, wheat and oats. In some cases the ammonium sulphate and ammonium nitrate was supplemented with ammonium phosphate fertilizer. Significant yield increases were obtained with ammonium sulphate fertilizer. When applied in the fall, ammonium sulphate was more effective that ammonium nitrate as a nitrogen carrier. en_US
dc.format.extent 6 leaves, 41 p. : en_US
dc.format.extent 2414522 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.title The effect of cultivation on the availability of soil nitrogen in some Manitoba soils en_US Soil Science en_US Master of Science (M.Sc.) en_US
dc.description.note Spring 1957 en_US

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