Variabilidade espacial da força de desprendimento de frutos do cafeeiro
Autor(a) principal: | |
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Data de Publicação: | 2014 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFLA |
Texto Completo: | http://repositorio.ufla.br/jspui/handle/1/28796 |
Resumo: | The aim of this study was to use the georeferencing and geostatistics techniques to evaluate the spatial variability of coffee fruit detachment force by semivariograms adjustments and kriging interpolation. The study was conducted in Três Pontas, MG, Brazil. The detachment force of green and mature coffee fruit was obtained throughout a prototype dynamometer on georeferenced locations. The spatial dependence data was evaluated by classical and robust semivariogram adjustments, using ordinary least square and weighted least squares methods. Maximum likelihood and restricted maximum likelihood methods were also evaluated, but only for the classical semivariogram. Spherical, exponential and Gaussian models were compared for all the evaluated methods of semivariogram estimation. The isoline maps obtained by kriging were generated based on the best adjustment method and model of the semivariogram function obtained by the statistical validation. The studied variables showed spatial dependence, which were modeled by semivariograms that allowed plot isoline maps of the spatial distribution obtained by kriging. It was possible to identify the best places to start the mechanical and selective coffee fruit harvest. |
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Variabilidade espacial da força de desprendimento de frutos do cafeeiroSpatial variability of the detachment force of coffee fruitCafé – Colheita mecanizadaAgricultura de precisão – Métodos estatísticosGeologia – Métodos estatísticosCoffee – Mechanized harvestingPrecision farming – Statistical methodsGeology – Statistical methodsCoffea arabicaThe aim of this study was to use the georeferencing and geostatistics techniques to evaluate the spatial variability of coffee fruit detachment force by semivariograms adjustments and kriging interpolation. The study was conducted in Três Pontas, MG, Brazil. The detachment force of green and mature coffee fruit was obtained throughout a prototype dynamometer on georeferenced locations. The spatial dependence data was evaluated by classical and robust semivariogram adjustments, using ordinary least square and weighted least squares methods. Maximum likelihood and restricted maximum likelihood methods were also evaluated, but only for the classical semivariogram. Spherical, exponential and Gaussian models were compared for all the evaluated methods of semivariogram estimation. The isoline maps obtained by kriging were generated based on the best adjustment method and model of the semivariogram function obtained by the statistical validation. The studied variables showed spatial dependence, which were modeled by semivariograms that allowed plot isoline maps of the spatial distribution obtained by kriging. It was possible to identify the best places to start the mechanical and selective coffee fruit harvest.O objetivo deste trabalho foi utilizar técnicas de georreferenciamento e de geoestatística para analisar a variabilidade espacial da força de desprendimento de frutos de cafeeiros por meio de semivariogramas e pela interpolação por krigagem. O trabalho foi conduzido no município de Três Pontas - MG, Brasil. A força de desprendimento dos frutos verdes e de cerejas dos cafeeiros foi obtida por meio de um protótipo de dinamômetro em pontos georreferenciados. A dependência espacial dos dados foi analisada por meio de ajustes de semivariogramas, clássico e robusto, para o método dos mínimos quadrados ordinários e ponderados, e apenas o ajuste clássico, para os métodos da máxima verossimilhança e máxima verossimilhança restrita. Testaram-se, para cada um dos métodos, os modelos esférico, exponencial e gaussiano. Os mapas de isolinhas obtidos por krigagem foram produzidos, baseados no melhor método e modelo de ajuste da função semivariograma, que foram obtidos pelas estatísticas de validação. As variáveis em estudo apresentaram estruturas de dependência espacial, as quais foram modeladas pelos semivariogramas, o que possibilitou a confecção dos mapas de isolinhas de distribuição espacial, obtidos por krigagem. Foi possível identificar os locais mais propícios para se iniciar a colheita seletiva e mecanizada dos frutos do cafeeiro.Associação Brasileira de Engenharia Agrícola2018-03-05T19:06:52Z2018-03-05T19:06:52Z2014-11info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfFERRAZ, G. A. e S. et al. Variabilidade espacial da força de desprendimento de frutos do cafeeiro. Engenharia Agrícola, Jaboticabal, v. 34, n. 6, p. 1210-1223, nov./dez. 2014.http://repositorio.ufla.br/jspui/handle/1/28796Engenharia Agrícolareponame:Repositório Institucional da UFLAinstname:Universidade Federal de Lavras (UFLA)instacron:UFLAAttribution-NonCommercial 4.0 Internationalhttp://creativecommons.org/licenses/by-nc/4.0/info:eu-repo/semantics/openAccessFerraz, Gabriel Araújo e SilvaSilva, Fábio Moreira daOliveira, Marcelo Silva deSilva, Flávio Castro daBueno, Rafael de Limapor2023-05-02T18:03:14Zoai:localhost:1/28796Repositório InstitucionalPUBhttp://repositorio.ufla.br/oai/requestnivaldo@ufla.br || repositorio.biblioteca@ufla.bropendoar:2023-05-02T18:03:14Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA)false |
dc.title.none.fl_str_mv |
Variabilidade espacial da força de desprendimento de frutos do cafeeiro Spatial variability of the detachment force of coffee fruit |
title |
Variabilidade espacial da força de desprendimento de frutos do cafeeiro |
spellingShingle |
Variabilidade espacial da força de desprendimento de frutos do cafeeiro Ferraz, Gabriel Araújo e Silva Café – Colheita mecanizada Agricultura de precisão – Métodos estatísticos Geologia – Métodos estatísticos Coffee – Mechanized harvesting Precision farming – Statistical methods Geology – Statistical methods Coffea arabica |
title_short |
Variabilidade espacial da força de desprendimento de frutos do cafeeiro |
title_full |
Variabilidade espacial da força de desprendimento de frutos do cafeeiro |
title_fullStr |
Variabilidade espacial da força de desprendimento de frutos do cafeeiro |
title_full_unstemmed |
Variabilidade espacial da força de desprendimento de frutos do cafeeiro |
title_sort |
Variabilidade espacial da força de desprendimento de frutos do cafeeiro |
author |
Ferraz, Gabriel Araújo e Silva |
author_facet |
Ferraz, Gabriel Araújo e Silva Silva, Fábio Moreira da Oliveira, Marcelo Silva de Silva, Flávio Castro da Bueno, Rafael de Lima |
author_role |
author |
author2 |
Silva, Fábio Moreira da Oliveira, Marcelo Silva de Silva, Flávio Castro da Bueno, Rafael de Lima |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Ferraz, Gabriel Araújo e Silva Silva, Fábio Moreira da Oliveira, Marcelo Silva de Silva, Flávio Castro da Bueno, Rafael de Lima |
dc.subject.por.fl_str_mv |
Café – Colheita mecanizada Agricultura de precisão – Métodos estatísticos Geologia – Métodos estatísticos Coffee – Mechanized harvesting Precision farming – Statistical methods Geology – Statistical methods Coffea arabica |
topic |
Café – Colheita mecanizada Agricultura de precisão – Métodos estatísticos Geologia – Métodos estatísticos Coffee – Mechanized harvesting Precision farming – Statistical methods Geology – Statistical methods Coffea arabica |
description |
The aim of this study was to use the georeferencing and geostatistics techniques to evaluate the spatial variability of coffee fruit detachment force by semivariograms adjustments and kriging interpolation. The study was conducted in Três Pontas, MG, Brazil. The detachment force of green and mature coffee fruit was obtained throughout a prototype dynamometer on georeferenced locations. The spatial dependence data was evaluated by classical and robust semivariogram adjustments, using ordinary least square and weighted least squares methods. Maximum likelihood and restricted maximum likelihood methods were also evaluated, but only for the classical semivariogram. Spherical, exponential and Gaussian models were compared for all the evaluated methods of semivariogram estimation. The isoline maps obtained by kriging were generated based on the best adjustment method and model of the semivariogram function obtained by the statistical validation. The studied variables showed spatial dependence, which were modeled by semivariograms that allowed plot isoline maps of the spatial distribution obtained by kriging. It was possible to identify the best places to start the mechanical and selective coffee fruit harvest. |
publishDate |
2014 |
dc.date.none.fl_str_mv |
2014-11 2018-03-05T19:06:52Z 2018-03-05T19:06:52Z |
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 |
FERRAZ, G. A. e S. et al. Variabilidade espacial da força de desprendimento de frutos do cafeeiro. Engenharia Agrícola, Jaboticabal, v. 34, n. 6, p. 1210-1223, nov./dez. 2014. http://repositorio.ufla.br/jspui/handle/1/28796 |
identifier_str_mv |
FERRAZ, G. A. e S. et al. Variabilidade espacial da força de desprendimento de frutos do cafeeiro. Engenharia Agrícola, Jaboticabal, v. 34, n. 6, p. 1210-1223, nov./dez. 2014. |
url |
http://repositorio.ufla.br/jspui/handle/1/28796 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.rights.driver.fl_str_mv |
Attribution-NonCommercial 4.0 International http://creativecommons.org/licenses/by-nc/4.0/ info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Attribution-NonCommercial 4.0 International http://creativecommons.org/licenses/by-nc/4.0/ |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Associação Brasileira de Engenharia Agrícola |
publisher.none.fl_str_mv |
Associação Brasileira de Engenharia Agrícola |
dc.source.none.fl_str_mv |
Engenharia Agrícola reponame:Repositório Institucional da UFLA instname:Universidade Federal de Lavras (UFLA) instacron:UFLA |
instname_str |
Universidade Federal de Lavras (UFLA) |
instacron_str |
UFLA |
institution |
UFLA |
reponame_str |
Repositório Institucional da UFLA |
collection |
Repositório Institucional da UFLA |
repository.name.fl_str_mv |
Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA) |
repository.mail.fl_str_mv |
nivaldo@ufla.br || repositorio.biblioteca@ufla.br |
_version_ |
1815439141418041344 |