Temporal dynamics of spectral reflectance and vegetation indices during canola crop cycle in southern Brazil
Autor(a) principal: | |
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Data de Publicação: | 2017 |
Outros Autores: | , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Ciência Rural |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000100200 |
Resumo: | ABSTRACT: The objective of this study was to characterize the variability of spectral reflectance and temporal profiles of vegetation indices associated with nitrogen fertilization, crop cycle periods, and weather conditions of the growing season in canola canopies in southern Brazil. An experiment was carried out during the 2013 and 2014 canola growing seasons at EMBRAPA Trigo, Passo Fundo, state of Rio Grande do Sul, Brazil. The experiment was conducted in a randomized block design with four replications. Five doses of nitrogen top dressing were used as treatments: 10, 20, 40, 80, and 160kg ha-1. Measurements were obtained with the spectroradiometer positioned above the canopy, to construct spectral reflectance curves for canola and establish temporal profiles for several vegetation indices (SR, NDVI, EVI, SAVI, and GNDVI). In addition, data on shoot dry matter were obtained and phenological stages were determined. The spectral reflectance curves of canola were reported to change with canopy growth and development. Temporal profiles of vegetation indices showed two maximum peaks, one before flowering and other after flowering. The indices SR, NDVI, EVI, SAVI, and GNDVI were able to characterize changes in the canola canopy over time, as a function of phenological phases, weather conditions, and nitrogen fertilization, throughout the development cycle. Plant growth and development, variations in crop management, and environmental conditions affect the spectral response of canola. |
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Temporal dynamics of spectral reflectance and vegetation indices during canola crop cycle in southern Brazilspectroradiometrynitrogen fertilizationBrassica napusABSTRACT: The objective of this study was to characterize the variability of spectral reflectance and temporal profiles of vegetation indices associated with nitrogen fertilization, crop cycle periods, and weather conditions of the growing season in canola canopies in southern Brazil. An experiment was carried out during the 2013 and 2014 canola growing seasons at EMBRAPA Trigo, Passo Fundo, state of Rio Grande do Sul, Brazil. The experiment was conducted in a randomized block design with four replications. Five doses of nitrogen top dressing were used as treatments: 10, 20, 40, 80, and 160kg ha-1. Measurements were obtained with the spectroradiometer positioned above the canopy, to construct spectral reflectance curves for canola and establish temporal profiles for several vegetation indices (SR, NDVI, EVI, SAVI, and GNDVI). In addition, data on shoot dry matter were obtained and phenological stages were determined. The spectral reflectance curves of canola were reported to change with canopy growth and development. Temporal profiles of vegetation indices showed two maximum peaks, one before flowering and other after flowering. The indices SR, NDVI, EVI, SAVI, and GNDVI were able to characterize changes in the canola canopy over time, as a function of phenological phases, weather conditions, and nitrogen fertilization, throughout the development cycle. Plant growth and development, variations in crop management, and environmental conditions affect the spectral response of canola.Universidade Federal de Santa Maria2017-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000100200Ciência Rural v.47 n.1 2017reponame:Ciência Ruralinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSM10.1590/0103-8478cr20151403info:eu-repo/semantics/openAccessPinto,Daniele GutterresFontana,Denise CybisDalmago,Genei AntonioCunha,Gilberto Rocca daFochesato,ElizandroVicari,Matheus BoniGouvêa,Jorge Alberto deSanti,Andersoneng2016-11-24T00:00:00ZRevista |
dc.title.none.fl_str_mv |
Temporal dynamics of spectral reflectance and vegetation indices during canola crop cycle in southern Brazil |
title |
Temporal dynamics of spectral reflectance and vegetation indices during canola crop cycle in southern Brazil |
spellingShingle |
Temporal dynamics of spectral reflectance and vegetation indices during canola crop cycle in southern Brazil Pinto,Daniele Gutterres spectroradiometry nitrogen fertilization Brassica napus |
title_short |
Temporal dynamics of spectral reflectance and vegetation indices during canola crop cycle in southern Brazil |
title_full |
Temporal dynamics of spectral reflectance and vegetation indices during canola crop cycle in southern Brazil |
title_fullStr |
Temporal dynamics of spectral reflectance and vegetation indices during canola crop cycle in southern Brazil |
title_full_unstemmed |
Temporal dynamics of spectral reflectance and vegetation indices during canola crop cycle in southern Brazil |
title_sort |
Temporal dynamics of spectral reflectance and vegetation indices during canola crop cycle in southern Brazil |
author |
Pinto,Daniele Gutterres |
author_facet |
Pinto,Daniele Gutterres Fontana,Denise Cybis Dalmago,Genei Antonio Cunha,Gilberto Rocca da Fochesato,Elizandro Vicari,Matheus Boni Gouvêa,Jorge Alberto de Santi,Anderson |
author_role |
author |
author2 |
Fontana,Denise Cybis Dalmago,Genei Antonio Cunha,Gilberto Rocca da Fochesato,Elizandro Vicari,Matheus Boni Gouvêa,Jorge Alberto de Santi,Anderson |
author2_role |
author author author author author author author |
dc.contributor.author.fl_str_mv |
Pinto,Daniele Gutterres Fontana,Denise Cybis Dalmago,Genei Antonio Cunha,Gilberto Rocca da Fochesato,Elizandro Vicari,Matheus Boni Gouvêa,Jorge Alberto de Santi,Anderson |
dc.subject.por.fl_str_mv |
spectroradiometry nitrogen fertilization Brassica napus |
topic |
spectroradiometry nitrogen fertilization Brassica napus |
description |
ABSTRACT: The objective of this study was to characterize the variability of spectral reflectance and temporal profiles of vegetation indices associated with nitrogen fertilization, crop cycle periods, and weather conditions of the growing season in canola canopies in southern Brazil. An experiment was carried out during the 2013 and 2014 canola growing seasons at EMBRAPA Trigo, Passo Fundo, state of Rio Grande do Sul, Brazil. The experiment was conducted in a randomized block design with four replications. Five doses of nitrogen top dressing were used as treatments: 10, 20, 40, 80, and 160kg ha-1. Measurements were obtained with the spectroradiometer positioned above the canopy, to construct spectral reflectance curves for canola and establish temporal profiles for several vegetation indices (SR, NDVI, EVI, SAVI, and GNDVI). In addition, data on shoot dry matter were obtained and phenological stages were determined. The spectral reflectance curves of canola were reported to change with canopy growth and development. Temporal profiles of vegetation indices showed two maximum peaks, one before flowering and other after flowering. The indices SR, NDVI, EVI, SAVI, and GNDVI were able to characterize changes in the canola canopy over time, as a function of phenological phases, weather conditions, and nitrogen fertilization, throughout the development cycle. Plant growth and development, variations in crop management, and environmental conditions affect the spectral response of canola. |
publishDate |
2017 |
dc.date.none.fl_str_mv |
2017-01-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000100200 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000100200 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/0103-8478cr20151403 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Universidade Federal de Santa Maria |
publisher.none.fl_str_mv |
Universidade Federal de Santa Maria |
dc.source.none.fl_str_mv |
Ciência Rural v.47 n.1 2017 reponame:Ciência Rural instname:Universidade Federal de Santa Maria (UFSM) instacron:UFSM |
instname_str |
Universidade Federal de Santa Maria (UFSM) |
instacron_str |
UFSM |
institution |
UFSM |
reponame_str |
Ciência Rural |
collection |
Ciência Rural |
repository.name.fl_str_mv |
|
repository.mail.fl_str_mv |
|
_version_ |
1749140550845464576 |