Calibration of chlorophyll hand-held meter based on vineyard NDVI zones for estimation of leaf N content
Autor(a) principal: | |
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Data de Publicação: | 2022 |
Outros Autores: | , , , |
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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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 |
|
_version_ |
1808128946462523392 |