Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/44633
DC FieldValueLanguage
dc.contributor.authorLee, Y.J.en_US
dc.contributor.author申 雍zh_TW
dc.contributor.authorYang, C.M.en_US
dc.contributor.authorChang, K.W.en_US
dc.contributor.authorShen, Y.en_US
dc.date2008zh_TW
dc.date.accessioned2014-06-06T08:12:57Z-
dc.date.available2014-06-06T08:12:57Z-
dc.identifier.issn0002-1962zh_TW
dc.identifier.urihttp://hdl.handle.net/11455/44633-
dc.description.abstractSpatial distribution of canopy N status is the primary information needed for precision management of N fertilizer. This study demonstrated the feasibility of a simple spectral index (SI) using the first derivative of canopy reflectance spectrum at 735 nm (dR/d lambda vertical bar(735)) to assess N concentration of rice (Oryza sativa L.) plants, and then validated the applicability of a simplified imaging system based on the derived spectral model from the dR/d lambda vertical bar(735) relationship in mapping canopy N status within field. Results showed that values of dR/d lambda vertical bar(735) were linearly related to plant N concentrations measured at the panicle formation stage. The leaf N accumulation per unit ground area was better fitted than other ratio-based SIs, such as simple ratio vegetation index (SRVI), normalized difference vegetation index (NDVI), R810/R560, and (R1100 - R660)/(R1100 + R660), and remained valid when pooling more data from different cropping seasons in varied years and locations. A simplified imaging system was assembled and mounted on a mobile lifter and a helicopter to take spectral imageries for mapping canopy N status within fields. Results indicated that the imaging system was able to provide field maps of canopy N status with reasonable accuracy (r = 0.465-0-912, root mean standard error [RMSE] = 0.100-0-550) from both remote sensing platforms.en_US
dc.language.isoen_USzh_TW
dc.relationAgronomy Journalen_US
dc.relation.ispartofseriesAgronomy Journal, Volume 100, Issue 1, Page(s) 205-212.en_US
dc.relation.urihttp://dx.doi.org/10.2134/agronj2007.0018en_US
dc.subjectleaf-area indexen_US
dc.subjectvegetation indexen_US
dc.subjectuse efficiencyen_US
dc.subjectdry-matteren_US
dc.subjectcornen_US
dc.subjectmanagementen_US
dc.subjectcropen_US
dc.subjectaccumulationen_US
dc.subjectphosphorusen_US
dc.subjectradiationen_US
dc.titleA simple spectral index using reflectance of 735 nm to assess nitrogen status of rice canopyen_US
dc.typeJournal Articlezh_TW
dc.identifier.doi10.2134/agronj2007.0018zh_TW
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.fulltextno fulltext-
item.grantfulltextnone-
item.cerifentitytypePublications-
item.languageiso639-1en_US-
item.openairetypeJournal Article-
Appears in Collections:土壤環境科學系
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