Assessment of Spectral Reflectance as Part of a Variable-Rate Nitrogen Management Strategy for Corn

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dc.contributor.authorLewis, Emily Kathrynen
dc.contributor.committeechairPhillips, Steven B.en
dc.contributor.committeememberMullins, Gregory L.en
dc.contributor.committeememberAlley, Marcus M.en
dc.contributor.departmentCrop and Soil Environmental Sciencesen
dc.date.accessioned2014-03-14T21:45:06Zen
dc.date.adate2004-10-12en
dc.date.available2014-03-14T21:45:06Zen
dc.date.issued2004-08-02en
dc.date.rdate2007-10-12en
dc.date.sdate2004-09-07en
dc.description.abstractSpectral reflectance-based, remote sensing technology has been used to adjust in-season nitrogen (N) fertilizer rates for wheat to account for spatial variability in grain yield potential at a sub-meter resolution. The objective of this study was to examine the relationships among spectral reflectance indices, corn tissue N content, chlorophyll measurements, plant size and spacing measurements, and grain yield to develop a similar strategy for variable-rate N management in corn. Irrigated and non-irrigated studies were conducted during the 2002 and 2003 growing seasons in eastern Virginia. Plots were treated with various rates of preplant, starter, and sidedress N fertilizer to establish a wide range of grain yield potential. Spectral measurements, tissue N, chlorophyll measurements, and plant physical measurements were collected at growth stages V6, V8, and V10. At maturity, grain yield was determined and correlated with in-season data and optimum N rate to calibrate in-season, variable-rate N fertilization strategies. Results from these studies indicate that spectral reflectance is well correlated with plant N uptake and chlorophyll meter readings and can also be correlated with final grain yield. These relationships may be used to develop a model to predict in-season, variable N application rates for corn production at a sub-meter resolution.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-09072004-114943en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-09072004-114943/en
dc.identifier.urihttp://hdl.handle.net/10919/44620en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartEKLMastersThesis.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectcornen
dc.subjectvariable-rate N managementen
dc.subjectin-season fertilizer recommendationen
dc.subjectspectral reflectanceen
dc.titleAssessment of Spectral Reflectance as Part of a Variable-Rate Nitrogen Management Strategy for Cornen
dc.typeThesisen
thesis.degree.disciplineCrop and Soil Environmental Sciencesen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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