Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/17985
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dc.contributor.authorSamborski, Stanislaw Men
dc.contributor.authorGozdowski, Dariuszen
dc.contributor.authorWalsh, Olga Sen
dc.contributor.authorLamb, Daviden
dc.contributor.authorStepien, Michalen
dc.contributor.authorGacek, Edward Sen
dc.contributor.authorDrzazga, Tadeuszen
dc.date.accessioned2015-10-09T12:41:00Z-
dc.date.issued2015-
dc.identifier.citationAgronomy Journal, 107(6), p. 2097-2106en
dc.identifier.issn1435-0645en
dc.identifier.issn0002-1962en
dc.identifier.urihttps://hdl.handle.net/1959.11/17985-
dc.description.abstractActive optical sensors (AOSs) measure crop reflectance at specific wavelengths and calculate vegetation indices (VIs) that are used to prescribe variable N fertilization. Visual observations of winter wheat ('Triticum aestivum' L.) plant greenness and density suggest that VI values may be genotype specific. Some sensor systems use correction coefficients to eliminate the effect of genotype on VI values. This study was conducted to assess the effects of winter wheat cultivars and growing conditions on canopy reflectance, as measured by red or amber normalized difference vegetative indices (NDVIs) derived from AOSs. Variations in NDVI values among three wheat cultivars were measured at three growth stages (Zadoks 31, 37, and 65) during 3 yr at three sites in Poland. GreenSeeker Model 505 and Crop Circle ACS-210 sensors were utilized to measure red and amber NDVIs, respectively. Significant (p < 0.05) differences in both forms of NDVI associated with wheat genotypes were observed across years and sites at Zadoks 31, the time when canopy sensing and N fertilization decisions are often made. Lack of a genotype Χ site interaction for both red and amber NDVIs and the presence of a significant genotype Χ year interaction for both VIs suggested that (i) canopy greenness and density of the same genotype measured at the same growth stage are likely to be stable across different growing conditions, and (ii) NDVI values for a particular genotype tend to vary more across years than across sites. Because developing temporally variable correction coefficients is not practical, we strongly recommend that an in situ calibration (based on in-field or a virtual reference strip) is utilized to normalize NDVI across genotypes, years, and sites.en
dc.languageenen
dc.publisherAmerican Society of Agronomy, Incen
dc.relation.ispartofAgronomy Journalen
dc.titleWinter Wheat Genotype Effect on Canopy Reflectance: Implications for Using NDVI for In-Season Nitrogen Topdressing Recommendationsen
dc.typeJournal Articleen
dc.identifier.doi10.2134/agronj14.0323en
dcterms.accessRightsGolden
dc.subject.keywordsAgricultural Spatial Analysis and Modellingen
dc.subject.keywordsCrop and Pasture Nutritionen
local.contributor.firstnameStanislaw Men
local.contributor.firstnameDariuszen
local.contributor.firstnameOlga Sen
local.contributor.firstnameDaviden
local.contributor.firstnameMichalen
local.contributor.firstnameEdward Sen
local.contributor.firstnameTadeuszen
local.subject.for2008070306 Crop and Pasture Nutritionen
local.subject.for2008070104 Agricultural Spatial Analysis and Modellingen
local.subject.seo2008820507 Wheaten
local.profile.schoolOffice of Faculty of Science, Agriculture, Business and Lawen
local.profile.emaildlamb@une.edu.auen
local.output.categoryC1en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.identifier.epublicationsrecordune-20150909-141350en
local.publisher.placeUnited States of Americaen
local.format.startpage2097en
local.format.endpage2106en
local.identifier.scopusid84945375598en
local.peerreviewedYesen
local.identifier.volume107en
local.identifier.issue6en
local.title.subtitleImplications for Using NDVI for In-Season Nitrogen Topdressing Recommendationsen
local.access.fulltextYesen
local.contributor.lastnameSamborskien
local.contributor.lastnameGozdowskien
local.contributor.lastnameWalshen
local.contributor.lastnameLamben
local.contributor.lastnameStepienen
local.contributor.lastnameGaceken
local.contributor.lastnameDrzazgaen
dc.identifier.staffune-id:dlamben
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.identifier.unepublicationidune:18195en
dc.identifier.academiclevelAcademicen
local.title.maintitleWinter Wheat Genotype Effect on Canopy Reflectanceen
local.output.categorydescriptionC1 Refereed Article in a Scholarly Journalen
local.search.authorSamborski, Stanislaw Men
local.search.authorGozdowski, Dariuszen
local.search.authorWalsh, Olga Sen
local.search.authorLamb, Daviden
local.search.authorStepien, Michalen
local.search.authorGacek, Edward Sen
local.search.authorDrzazga, Tadeuszen
local.uneassociationUnknownen
local.identifier.wosid000368342900014en
local.year.published2015en
local.subject.for2020300407 Crop and pasture nutritionen
local.subject.for2020300206 Agricultural spatial analysis and modellingen
local.subject.seo2020260312 Wheaten
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