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dc.contributor.advisorScharf, Peter C. (Peter Clifton), 1959-en
dc.contributor.authorMedeiros, João A. S.en_US
dc.date.issued2006eng
dc.date.submitted2006 Springen
dc.descriptionThe 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.descriptionTitle from title screen of research.pdf file viewed on (February 9, 2007)en_US
dc.descriptionIncludes bibliographical references.en_US
dc.descriptionThesis (M.S.) University of Missouri-Columbia 2006.en_US
dc.descriptionDissertations, Academic -- University of Missouri--Columbia -- Agronomy.en_US
dc.description.abstractTraditionally, 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.identifier.merlin.b5772099xen_US
dc.identifier.otherMedeirosJ-050506-T3942en_US
dc.identifier.urihttp://hdl.handle.net/10355/4533
dc.publisherUniversity of Missouri--Columbiaen_US
dc.relation.ispartofcollection2006 Freely available theses (MU)
dc.relation.ispartofcommunityUniversity of Missouri-Columbia. Graduate School. Theses and Dissertations. Theses. 2006 Theses
dc.subject.lcshUrea as fertilizeren_US
dc.subject.lcshCrops and nitrogenen_US
dc.subject.lcshWheat -- Yieldsen_US
dc.titleManagement alternatives for urea use in corn and wheat productionen_US
dc.typeThesisen_US
thesis.degree.disciplineAgronomyeng
thesis.degree.grantorUniversity of Missouri--Columbiaeng
thesis.degree.levelMastersen_US
thesis.degree.nameM.S.en_US


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