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dc.contributor.advisorMotavalli, Peter Parvizen
dc.contributor.authorMerchán Paniagua, Saraen_US
dc.date.issued2006eng
dc.date.submitted2006 Fallen
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 August 24, 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 -- Soil, environmental and atmospheric sciences.en_US
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.en_US
dc.identifier.merlin.b59447382en_US
dc.identifier.oclc166325388en_US
dc.identifier.otherMerchanPaniaguaS-010307-T5298en_US
dc.identifier.urihttp://hdl.handle.net/10355/4631
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.lcshNitrogen fertilizers -- Controlen_US
dc.subject.lcshSoils -- Nitrogen contenten_US
dc.subject.lcshDrainageen_US
dc.subject.lcshSoil moisture -- Measurementen_US
dc.subject.lcshClaypan soilsen_US
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 soilsen_US
dc.typeThesisen_US
thesis.degree.disciplineSoil, environmental and atmospheric sciencesen_US
thesis.degree.disciplineSoil, environmental and atmospheric scienceseng
thesis.degree.grantorUniversity of Missouri--Columbiaen_US
thesis.degree.levelMastersen_US
thesis.degree.nameM.S.en_US


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