Management alternatives for urea use in corn and wheat production

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Management alternatives for urea use in corn and wheat production

Please use this identifier to cite or link to this item: http://hdl.handle.net/10355/4533

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dc.contributor.advisor Scharf, Peter C. (Peter Clifton), 1959- en
dc.contributor.author Medeiros, João A. S. en_US
dc.date.accessioned 2010-01-12T17:47:31Z
dc.date.available 2010-01-12T17:47:31Z
dc.date.issued 2006 en_US
dc.date.submitted 2006 Spring en
dc.identifier.other MedeirosJ-050506-T3942 en_US
dc.identifier.uri http://hdl.handle.net/10355/4533
dc.description The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. en_US
dc.description Title from title screen of research.pdf file viewed on (February 9, 2007) en_US
dc.description Includes bibliographical references. en_US
dc.description Thesis (M.S.) University of Missouri-Columbia 2006. en_US
dc.description Dissertations, Academic -- University of Missouri--Columbia -- Agronomy. en_US
dc.description.abstract Traditionally, urea has been incorporated to avoid losses of N by ammonia volatilization. However, this option is not available when topdressing wheat. The objective of this project is to evaluate several strategies designed to reduce the risk of ammonia volatilization loss from urea topdress applied on wheat. The tested strategies included treating urea with Agrotain (a urease inhibitor) or Agrotain + dicyandiamide (DCD), and use of coated urea products. Fertilizers were applied at a rate of 80 kg N ha-1. In 2004, wheat yields were low and none of the strategies designed to reduce N loss resulted in higher wheat yields with 95% confidence. However, the weather was favorable for ammonia volatilization and there was evidence from both yield and reflectance that urea + Agrotain + DCD was more effective than urea in delivering N to the crop. In 2005, urea + Agrotain, urea + Agrotain + DCD, and ammonium nitrateproduced higher yields when compared with broadcast urea. The addition of a timing effect for the 2005 experiment resulted in a significant and large yield response when treatments were applied in March compared to in January. Application of polymer- and gel-coated urea did not improve wheat yield relative to urea in either year. Agrotain + DCD was the most effective treatment for increasing yield and profitability from urea over the two study years. en_US
dc.language.iso en_US en_US
dc.publisher University of Missouri--Columbia en_US
dc.subject.lcsh Urea as fertilizer en_US
dc.subject.lcsh Crops and nitrogen en_US
dc.subject.lcsh Wheat -- Yields en_US
dc.title Management alternatives for urea use in corn and wheat production en_US
dc.type Thesis en_US
thesis.degree.discipline Agronomy en_US
thesis.degree.grantor University of Missouri--Columbia en_US
thesis.degree.name M.S. en_US
thesis.degree.level Masters en_US
dc.identifier.merlin .b5772099x en_US
dc.relation.ispartofcommunity University of Missouri-Columbia. Graduate School. Theses and Dissertations. Theses. 2006 Theses
dc.relation.ispartofcollection 2006 Freely available theses (MU)


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