Use of slow-release N fertilizer to control nitrogen losses due to spatial and climatic differences in soil moisture conditions and drainage in claypan soils

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Use of slow-release N fertilizer to control nitrogen losses due to spatial and climatic differences in soil moisture conditions and drainage in claypan soils

Please use this identifier to cite or link to this item: http://hdl.handle.net/10355/4631

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dc.contributor.advisor Motavalli, Peter Parviz en
dc.contributor.author Merchán Paniagua, Sara en_US
dc.date.accessioned 2010-01-12T17:49:26Z
dc.date.available 2010-01-12T17:49:26Z
dc.date.issued 2006 en_US
dc.date.submitted 2006 Fall en
dc.identifier.other MerchanPaniaguaS-010307-T5298 en_US
dc.identifier.uri http://hdl.handle.net/10355/4631
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 August 24, 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 -- Soil, environmental and atmospheric sciences. en_US
dc.description.abstract Agricultural 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.language.iso en_US en_US
dc.publisher University of Missouri--Columbia en_US
dc.subject.lcsh Nitrogen fertilizers -- Control en_US
dc.subject.lcsh Soils -- Nitrogen content en_US
dc.subject.lcsh Drainage en_US
dc.subject.lcsh Soil moisture -- Measurement en_US
dc.subject.lcsh Claypan soils en_US
dc.title Use of slow-release N fertilizer to control nitrogen losses due to spatial and climatic differences in soil moisture conditions and drainage in claypan soils en_US
dc.type Thesis en_US
thesis.degree.discipline Soil, environmental and atmospheric sciences 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 .b59447382 en_US
dc.identifier.oclc 166325388 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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