Double sigmoidal models describing the growth of coffee berries
ABSTRACT: This study aimed to verify if the growth pattern of coffee berries, considering fresh mass accumulation over time, is double sigmoid and to select the most suitable nonlinear model to describe such behavior. Data used consisted of fourteen longitudinal observations of average fresh mass of...
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Universidade Federal de Santa Maria
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doaj-0ca7b7f3533548fd89a12d97fb45db6c2020-11-24T23:23:56ZengUniversidade Federal de Santa MariaCiência Rural1678-459647810.1590/0103-8478cr20160646S0103-84782017000800401Double sigmoidal models describing the growth of coffee berriesTales Jesus FernandesAdriele Aparecida PereiraJoel Augusto MunizABSTRACT: This study aimed to verify if the growth pattern of coffee berries, considering fresh mass accumulation over time, is double sigmoid and to select the most suitable nonlinear model to describe such behavior. Data used consisted of fourteen longitudinal observations of average fresh mass of coffee berries obtained in an experiment with the cultivar Obatã IAC 1669-20. The fits provided by the Logistic and Gompertz models were compared in their single and double versions. Parameters were estimated using the least squares method using the Gauss-Newton algorithm implemented in the nls function of the R software. It can be concluded that the growth pattern of the coffee fruit, in fresh mass accumulation, is double sigmoid. The double Gompertz and double Logistic models were adequate to describe such a growth curve, with a superiority of the double Logistic model.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000800401&lng=en&tlng=enCoffea arabicaduplo Gompertzduplo Logísticonão linear |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Tales Jesus Fernandes Adriele Aparecida Pereira Joel Augusto Muniz |
spellingShingle |
Tales Jesus Fernandes Adriele Aparecida Pereira Joel Augusto Muniz Double sigmoidal models describing the growth of coffee berries Ciência Rural Coffea arabica duplo Gompertz duplo Logístico não linear |
author_facet |
Tales Jesus Fernandes Adriele Aparecida Pereira Joel Augusto Muniz |
author_sort |
Tales Jesus Fernandes |
title |
Double sigmoidal models describing the growth of coffee berries |
title_short |
Double sigmoidal models describing the growth of coffee berries |
title_full |
Double sigmoidal models describing the growth of coffee berries |
title_fullStr |
Double sigmoidal models describing the growth of coffee berries |
title_full_unstemmed |
Double sigmoidal models describing the growth of coffee berries |
title_sort |
double sigmoidal models describing the growth of coffee berries |
publisher |
Universidade Federal de Santa Maria |
series |
Ciência Rural |
issn |
1678-4596 |
description |
ABSTRACT: This study aimed to verify if the growth pattern of coffee berries, considering fresh mass accumulation over time, is double sigmoid and to select the most suitable nonlinear model to describe such behavior. Data used consisted of fourteen longitudinal observations of average fresh mass of coffee berries obtained in an experiment with the cultivar Obatã IAC 1669-20. The fits provided by the Logistic and Gompertz models were compared in their single and double versions. Parameters were estimated using the least squares method using the Gauss-Newton algorithm implemented in the nls function of the R software. It can be concluded that the growth pattern of the coffee fruit, in fresh mass accumulation, is double sigmoid. The double Gompertz and double Logistic models were adequate to describe such a growth curve, with a superiority of the double Logistic model. |
topic |
Coffea arabica duplo Gompertz duplo Logístico não linear |
url |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000800401&lng=en&tlng=en |
work_keys_str_mv |
AT talesjesusfernandes doublesigmoidalmodelsdescribingthegrowthofcoffeeberries AT adrieleaparecidapereira doublesigmoidalmodelsdescribingthegrowthofcoffeeberries AT joelaugustomuniz doublesigmoidalmodelsdescribingthegrowthofcoffeeberries |
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1725562680375246848 |