Calibration of chlorophyll hand-held meter based on vineyard NDVI zones for estimation of leaf N content

Detalhes bibliográficos
Autor(a) principal: da Silva, Thassio Monteiro Menezes [UNESP]
Data de Publicação: 2022
Outros Autores: Costa, Bruno Ricardo Silva [UNESP], Oldoni, Henrique [UNESP], Mitsuyuki, Milene Corso, Bassoi, Luís Henrique
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1590/1413-7054202246006222
http://hdl.handle.net/11449/246081
Resumo: The monitoring of chlorophyll content in grapevine leaves allows us to evaluate their N status, assisting with the information for the decision make about nutrient rate and application time to the vineyard. The present work aimed to propose an easy-to-use procedure for the calibration of a chlorophyll hand-held meter based on the NDVI homogeneous zones in a vineyard for the device readings and leaf sampling. We evaluated the wine grape ‘Chardonnay’ growing under drip irrigation in a vineyard located in the Southeast region of Brazil. Readings of the relative chlorophyll indices (a, b, and total) were taken in situ four times throughout the 2019 growing season, with the device placed on two leaves of every 40 pre-selected target plants in two homogeneous zones of NDVI previously defined in the vineyard. Subsequently, the chlorophyll and leaf nitrogen contents were determined in laboratory to relate them to the chlorophyll meter readings through generalized estimation equations. The chlorophyll meter is capable of estimating the levels of chlorophyll a, b and total by the models generated with an error of 0.98, 0.58, and 1.47 µg ml-1 cm-2 for calibration and of 1.03, 0.67, and 1.49 µg ml-1 cm-2 for prediction, respectively. The functions developed for the leaf N content present calibration error of 1.49 g kg-1 and prediction error of 3.39 g kg-1, but capable of providing an estimate when error is less than the amplitude of nitrogen sufficiency.
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spelling Calibration of chlorophyll hand-held meter based on vineyard NDVI zones for estimation of leaf N contentCalibração do medidor portátil de clorofila com base em zonas de NDVI do vinhedo para a estimativa do contéudo de N na folhadrip irrigationprecision viticultureVitis vinifera L.wine grapevineThe monitoring of chlorophyll content in grapevine leaves allows us to evaluate their N status, assisting with the information for the decision make about nutrient rate and application time to the vineyard. The present work aimed to propose an easy-to-use procedure for the calibration of a chlorophyll hand-held meter based on the NDVI homogeneous zones in a vineyard for the device readings and leaf sampling. We evaluated the wine grape ‘Chardonnay’ growing under drip irrigation in a vineyard located in the Southeast region of Brazil. Readings of the relative chlorophyll indices (a, b, and total) were taken in situ four times throughout the 2019 growing season, with the device placed on two leaves of every 40 pre-selected target plants in two homogeneous zones of NDVI previously defined in the vineyard. Subsequently, the chlorophyll and leaf nitrogen contents were determined in laboratory to relate them to the chlorophyll meter readings through generalized estimation equations. The chlorophyll meter is capable of estimating the levels of chlorophyll a, b and total by the models generated with an error of 0.98, 0.58, and 1.47 µg ml-1 cm-2 for calibration and of 1.03, 0.67, and 1.49 µg ml-1 cm-2 for prediction, respectively. The functions developed for the leaf N content present calibration error of 1.49 g kg-1 and prediction error of 3.39 g kg-1, but capable of providing an estimate when error is less than the amplitude of nitrogen sufficiency.Universidade Estadual Paulista/UNESP Faculdade de Ciências Agronômicas, SPEmpresa Brasileira de Pesquisa Agropecuária/Embrapa Centro Nacional de Pesquisa e Desenvolvimento de Instrumentação Agropecuária Embrapa Instrumentação, SPUniversidade Estadual Paulista/UNESP Faculdade de Ciências Agronômicas, SPUniversidade Estadual Paulista (UNESP)Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA)da Silva, Thassio Monteiro Menezes [UNESP]Costa, Bruno Ricardo Silva [UNESP]Oldoni, Henrique [UNESP]Mitsuyuki, Milene CorsoBassoi, Luís Henrique2023-07-29T12:31:11Z2023-07-29T12:31:11Z2022-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1590/1413-7054202246006222Ciencia e Agrotecnologia, v. 46.1981-18291413-7054http://hdl.handle.net/11449/24608110.1590/1413-70542022460062222-s2.0-85139920778Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengCiencia e Agrotecnologiainfo:eu-repo/semantics/openAccess2023-07-29T12:31:11Zoai:repositorio.unesp.br:11449/246081Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T18:33:03.851699Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Calibration of chlorophyll hand-held meter based on vineyard NDVI zones for estimation of leaf N content
Calibração do medidor portátil de clorofila com base em zonas de NDVI do vinhedo para a estimativa do contéudo de N na folha
title Calibration of chlorophyll hand-held meter based on vineyard NDVI zones for estimation of leaf N content
spellingShingle Calibration of chlorophyll hand-held meter based on vineyard NDVI zones for estimation of leaf N content
da Silva, Thassio Monteiro Menezes [UNESP]
drip irrigation
precision viticulture
Vitis vinifera L.
wine grapevine
title_short Calibration of chlorophyll hand-held meter based on vineyard NDVI zones for estimation of leaf N content
title_full Calibration of chlorophyll hand-held meter based on vineyard NDVI zones for estimation of leaf N content
title_fullStr Calibration of chlorophyll hand-held meter based on vineyard NDVI zones for estimation of leaf N content
title_full_unstemmed Calibration of chlorophyll hand-held meter based on vineyard NDVI zones for estimation of leaf N content
title_sort Calibration of chlorophyll hand-held meter based on vineyard NDVI zones for estimation of leaf N content
author da Silva, Thassio Monteiro Menezes [UNESP]
author_facet da Silva, Thassio Monteiro Menezes [UNESP]
Costa, Bruno Ricardo Silva [UNESP]
Oldoni, Henrique [UNESP]
Mitsuyuki, Milene Corso
Bassoi, Luís Henrique
author_role author
author2 Costa, Bruno Ricardo Silva [UNESP]
Oldoni, Henrique [UNESP]
Mitsuyuki, Milene Corso
Bassoi, Luís Henrique
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Universidade Estadual Paulista (UNESP)
Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA)
dc.contributor.author.fl_str_mv da Silva, Thassio Monteiro Menezes [UNESP]
Costa, Bruno Ricardo Silva [UNESP]
Oldoni, Henrique [UNESP]
Mitsuyuki, Milene Corso
Bassoi, Luís Henrique
dc.subject.por.fl_str_mv drip irrigation
precision viticulture
Vitis vinifera L.
wine grapevine
topic drip irrigation
precision viticulture
Vitis vinifera L.
wine grapevine
description The monitoring of chlorophyll content in grapevine leaves allows us to evaluate their N status, assisting with the information for the decision make about nutrient rate and application time to the vineyard. The present work aimed to propose an easy-to-use procedure for the calibration of a chlorophyll hand-held meter based on the NDVI homogeneous zones in a vineyard for the device readings and leaf sampling. We evaluated the wine grape ‘Chardonnay’ growing under drip irrigation in a vineyard located in the Southeast region of Brazil. Readings of the relative chlorophyll indices (a, b, and total) were taken in situ four times throughout the 2019 growing season, with the device placed on two leaves of every 40 pre-selected target plants in two homogeneous zones of NDVI previously defined in the vineyard. Subsequently, the chlorophyll and leaf nitrogen contents were determined in laboratory to relate them to the chlorophyll meter readings through generalized estimation equations. The chlorophyll meter is capable of estimating the levels of chlorophyll a, b and total by the models generated with an error of 0.98, 0.58, and 1.47 µg ml-1 cm-2 for calibration and of 1.03, 0.67, and 1.49 µg ml-1 cm-2 for prediction, respectively. The functions developed for the leaf N content present calibration error of 1.49 g kg-1 and prediction error of 3.39 g kg-1, but capable of providing an estimate when error is less than the amplitude of nitrogen sufficiency.
publishDate 2022
dc.date.none.fl_str_mv 2022-01-01
2023-07-29T12:31:11Z
2023-07-29T12:31:11Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://dx.doi.org/10.1590/1413-7054202246006222
Ciencia e Agrotecnologia, v. 46.
1981-1829
1413-7054
http://hdl.handle.net/11449/246081
10.1590/1413-7054202246006222
2-s2.0-85139920778
url http://dx.doi.org/10.1590/1413-7054202246006222
http://hdl.handle.net/11449/246081
identifier_str_mv Ciencia e Agrotecnologia, v. 46.
1981-1829
1413-7054
10.1590/1413-7054202246006222
2-s2.0-85139920778
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Ciencia e Agrotecnologia
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.source.none.fl_str_mv Scopus
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv
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