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dc.contributor.advisorMotavalli, Peter Parvizeng
dc.contributor.authorMerchán Paniagua, Saraeng
dc.date.issued2006eng
dc.date.submitted2006 Falleng
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.eng
dc.descriptionTitle from title screen of research.pdf file (viewed on August 24, 2007)eng
dc.descriptionIncludes bibliographical references.eng
dc.descriptionThesis (M.S.) University of Missouri-Columbia 2006.eng
dc.descriptionDissertations, Academic -- University of Missouri--Columbia -- Soil, environmental and atmospheric sciences.eng
dc.description.abstractAgricultural soils are a major source of nitrous oxide (N₂O) which has a significant environmental impact on global warming and ozone depletion. However, there is little information on soil N₂O emissions under different drainage and irrigation treatments in claypan soils. The objectives of this research were to determine the relationship between soil N₂O efflux, temperature, soil NO₃ --N, and soil water content and to examine the performance of polymer-coated urea (PCU) compared to conventional urea in relation to crop N uptake and environmental N loss under four drainage/irrigation treatments in a claypan soil in northeast Missouri. The treatments consisted of: 1) no irrigation or drainage (NIN), 2) no irrigation and drainage (NID), 3) subirrigation and drainage (SUB), and 4) overhead irrigation and no drainage (OND). The plots were split into N fertilizer treatments of pre-plant-applied conventional urea or polymer-coated urea at rates of 0, 140, and 280 kg N ha-¹. At the beginning of 2004, significantly lower soil N₂O flux was measured with application of PCU under NIN and OND. However, no consistent differences in soil N₂O efflux between fertilizers were observed in 2005, probably due to the lower precipitation that year. Higher NO₃ --N concentrations were observed under application of urea at the beginning of the 2004 growing season. In contrast, PCU led to higher NO₃ --N concentration later in the growing season. No differences were observed between fertilizers. The results of this study suggest that PCU may be effective in reducing environmental N losses under wet conditions early in the growing season.eng
dc.identifier.merlin.b59447382eng
dc.identifier.oclc166325388eng
dc.identifier.otherMerchanPaniaguaS-010307-T5298eng
dc.identifier.urihttp://hdl.handle.net/10355/4631eng
dc.publisherUniversity of Missouri--Columbiaeng
dc.relation.ispartofcollection2006 Freely available theses (MU)eng
dc.relation.ispartofcommunityUniversity of Missouri-Columbia. Graduate School. Theses and Dissertations. Theses. 2006 Theseseng
dc.subject.lcshNitrogen fertilizers -- Controleng
dc.subject.lcshSoils -- Nitrogen contenteng
dc.subject.lcshDrainageeng
dc.subject.lcshSoil moisture -- Measurementeng
dc.subject.lcshClaypan soilseng
dc.titleUse of slow-release N fertilizer to control nitrogen losses due to spatial and climatic differences in soil moisture conditions and drainage in claypan soilseng
dc.typeThesiseng
thesis.degree.disciplineSoil, environmental and atmospheric sciences (MU)eng
thesis.degree.grantorUniversity of Missouri--Columbiaeng
thesis.degree.levelMasterseng
thesis.degree.nameM.S.eng


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