Fitting nonlinear models to data from the biquinho pepper plant

Authors

Keywords:

Regression, Growth models, Pepper cultivation

Abstract

 The main aim of the research was to fit non-linear growth models to biquinho pepper plant height data.  The data were adapted from an experiment carried out in a greenhouse at the Agricultural Engineering Academic Unit (UAEAg), Campus I, of the Federal University of Campina Grande - UFCG. BRS Moema (Capsicum chinense) pepper seeds, developed by the company ISLA Seeds, were used. The sowing recommendations were suggested by the company: depth of 0.5 cm and composition of the soil substrate classified as Eutrophic Gray Clay. The plants were irrigated with 100% of their water requirement with wastewater treated by the UASB+ WETLAND sludge blanket up-flow anaerobic reactor. Assessments were carried out every seven days, totaling 21 assessments, 163 days after sowing (DAS), with two plants per replication. The models used in the adjustment were  the logistic, Gompertz and von Bertalanffy. The assumptions under residuals of the adjusted models were verified using the Shapiro-Wilk (normality) and Bartlett (homogeneity of variance) tests. Furthermore, models with different variance structures and autoregressive terms were tested. All models evaluated proved to be adequate to adjust to data on the height of the biquinho pepper plant. However, according to the Akaike criterion (AIC), the von Bertalanffy model considering homogeneity of variance without the structure of autoregressive terms presented a better fit. The adjustment estimated an asymptotic plant height of 26.32cm and an inflection point of the curve when it reached approximately 52 days after sowing.

Author Biography

Rick Anderson Mangueira, Escola Superior de Agricultura "Luiz de Queiroz"- ESALQ/USP

Departamento de Ciências Exatas

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Published

04-11-2024

How to Cite

Mangueira, R. A., Xavier Oioli, G., Farias Silva, V., Silva de Medeiros, E., & Piedade Vigas, V. (2024). Fitting nonlinear models to data from the biquinho pepper plant. Sigmae, 13(4), 158–164. Retrieved from https://publicacoes.unifal-mg.edu.br/revistas/index.php/sigmae/article/view/2461

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Section

Applied Statistics