Navegando por Autor "Muniz, Fabiana Rezende"

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    Fitting nonlinear autoregressive models to describe coffee seed germination
    (Universidade Federal de Santa Maria, 2014-11) Sousa, Iábita Fabiana; Kunzle Neto, Johan Eugen; Muniz, Joel Augusto; Guimarães, Renato Mendes; Savian, Taciana Villela; Muniz, Fabiana Rezende
    Cumulative germination of coffee has a longitudinal behavior mathematically characterized by a sigmoidal model. In the seed germination evaluation, the study of the germination curve may contribute to better understanding of this process. The aim of this study was to evaluate the goodness of fi t of Logistic and Gompertz models, with independent and fi rst-order autoregressive errors structure, AR (1), in the description of coffee (Coffea arabica L.) line Catuai vermelho IAC 99 germination, at fi ve different potential germination. The data used were from an experiment conducted in 2011 at the Seed Analysis Laboratory of the Federal University of Lavras. The Logistic and Gompertz nonlinear models were appropriately adjusted to the percentage germination data. The Gompertz model with fi rst-order autoregressive errors structure was the best to describe the germination process.