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http://repositorio.ufla.br/jspui/handle/1/31445| Title: | Double sigmoidal models describing the growth of coffee berries |
| Other Titles: | Modelos duplo sigmoidais na descrição do crescimento de frutos do cafeeiro |
| Keywords: | Coffea arabica Double Gompertz Double logistic Duplo Gompertz Duplo logístico |
| Issue Date: | 2017 |
| Publisher: | Universidade Federal de Santa Maria |
| Citation: | FERNANDES, T. J.; PEREIRA, A. A.; MUNIZ, J. A. Double sigmoidal models describing the growth of coffee berries. Ciência Rural, Santa Maria, v. 47, n. 8, 2017. |
| 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. |
| URI: | http://repositorio.ufla.br/jspui/handle/1/31445 |
| Appears in Collections: | DES - Artigos publicados em periódicos DEX - Artigos publicados em periódicos |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| ARTIGO_Double sigmoidal models describing the growth of coffee berries.pdf | 611 kB | Adobe PDF | View/Open |
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