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Registro Completo |
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
30/11/2022 |
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Data da última atualização: |
22/01/2024 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
SILVA, T. M. M. da; COSTA, B. R. S.; OLDONI, H.; FOSCHINI, M. M.; BASSOI, L. H. |
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Afiliação: |
MILENE CORSO MITSUYUKI, CNPDIA; LUIS HENRIQUE BASSOI, CNPDIA. |
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Título: |
Calibration of chlorophyll hand-held meter based on vineyard NDVI zones for estimation of leaf N content. |
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Ano de publicação: |
2022 |
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Fonte/Imprenta: |
Ciência e Agrotecnologia, v. 46, e006222, 2022. |
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Páginas: |
11 p. |
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ISSN: |
1981-1829 |
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DOI: |
http://dx.doi.org/10.1590/1413-7054202246006222 |
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Idioma: |
Inglês |
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Conteúdo: |
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, band 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-2for 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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Palavras-Chave: |
Drip irrigation; Precision viticulture; Wine grapevine. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/1148987/1/P-Calibration-of-chlorophyll-hand-held-meter-based-on.pdf
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Marc: |
LEADER 02210naa a2200241 a 4500
001 2148987
005 2024-01-22
008 2022 bl uuuu u00u1 u #d
022 $a1981-1829
024 7 $ahttp://dx.doi.org/10.1590/1413-7054202246006222$2DOI
100 1 $aSILVA, T. M. M. da
245 $aCalibration of chlorophyll hand-held meter based on vineyard NDVI zones for estimation of leaf N content.$h[electronic resource]
260 $c2022
300 $a11 p.
520 $aThe 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, band 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-2for 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.
653 $aDrip irrigation
653 $aPrecision viticulture
653 $aWine grapevine
700 1 $aCOSTA, B. R. S.
700 1 $aOLDONI, H.
700 1 $aFOSCHINI, M. M.
700 1 $aBASSOI, L. H.
773 $tCiência e Agrotecnologia$gv. 46, e006222, 2022.
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Registro original: |
Embrapa Instrumentação (CNPDIA) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Gado de Corte. Para informações adicionais entre em contato com cnpgc.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Gado de Corte. |
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Data corrente: |
01/08/2011 |
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Data da última atualização: |
01/08/2011 |
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Autoria: |
KELEMU, S.; BADEL, J. L; FERNANDES, C. D. |
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Afiliação: |
S. Kelemu; J. L. Badel; CELSO DORNELAS FERNANDES, CNPGC. |
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Título: |
A new dieback disease of the forage legume Stylosanthes guianensis in South America. |
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Ano de publicação: |
1997 |
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Fonte/Imprenta: |
Canadian Journal of Plant Pathology, v. 19, p.376-379, 1997. |
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Idioma: |
Inglês |
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Conteúdo: |
A wilt and eventual dieback disease of the forage legume Stylosanthes guianensis, which occurs widely in Colombia and Brazil, is described. The causal agent of the wilt disease is identified as Lasiodiplodia theobromae, a virulent, unspecialized, facultative wound pathogen with worldwide distribution and more than 500 different host plants. The l-septatc conidia are slow maturing, brown, thick walled, and striate. Genotypes of S. guianensis vary in their reactions to the pathogen. Of eight important S. guianensis genotypes tested for their reaction to the pathogen, the Brazilian cultivar Mineirao was the most susceptible, and CIAT 10 136 and FM 9405 parcela I were the most resistant. |
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Thesagro: |
Pastagem; Stylosanthes Guianensis. |
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Thesaurus NAL: |
pastures. |
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Categoria do assunto: |
K Ciência Florestal e Produtos de Origem Vegetal |
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Marc: |
LEADER 01231naa a2200181 a 4500
001 1897057
005 2011-08-01
008 1997 bl uuuu u00u1 u #d
100 1 $aKELEMU, S.
245 $aA new dieback disease of the forage legume Stylosanthes guianensis in South America.$h[electronic resource]
260 $c1997
520 $aA wilt and eventual dieback disease of the forage legume Stylosanthes guianensis, which occurs widely in Colombia and Brazil, is described. The causal agent of the wilt disease is identified as Lasiodiplodia theobromae, a virulent, unspecialized, facultative wound pathogen with worldwide distribution and more than 500 different host plants. The l-septatc conidia are slow maturing, brown, thick walled, and striate. Genotypes of S. guianensis vary in their reactions to the pathogen. Of eight important S. guianensis genotypes tested for their reaction to the pathogen, the Brazilian cultivar Mineirao was the most susceptible, and CIAT 10 136 and FM 9405 parcela I were the most resistant.
650 $apastures
650 $aPastagem
650 $aStylosanthes Guianensis
700 1 $aBADEL, J. L
700 1 $aFERNANDES, C. D.
773 $tCanadian Journal of Plant Pathology$gv. 19, p.376-379, 1997.
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