Abstract
This study aimed to fit nonlinear regression models to model the growth of the characters fruit length (FL) and fruit width (FW) of pepper genotypes (Capsicum annuum L.) over time using the method of ordinary least squares (OLS); and identify the model with the best fit and compare it to the model obtained via nonlinear quantile regression (QR) in the 0.25, 0.5, and 0.75 quantiles. Three regression models (Logistic, Gompertz, and von Bertalanffy) and four fit quality evaluators were adopted: Akaike information criterion, residual mean absolute deviation, and parametric and intrinsic curvature measurements. Five commercial genotypes of pepper were evaluated. Characters FL and FW were evaluated weekly from seven days after flowering, totaling ten measurements. In the estimation by OLS, the Logistic and von Bertalanffy models were considered adequate according to the quality evaluators. In the comparison between the models above by OLS and QR, the superiority of models obtained by QR was verified for the character FL. For the character FW, QR was efficient in three out of the five genotypes, being a valuable alternative in the study of fruit growth.
Highlights
Pepper (Capsicum spp.) is one of the main horticultural crops in the world, with wide variation of extrinsic and intrinsic characteristics and wide plasticity of uses, Rev
This work fits nonlinear regression models to model the characters fruit length and width of pepper genotypes (Capsicum annuum L.) over time using the method of ordinary least squares (OLS); identifies the model with the best fit; and compares it to the model obtained via nonlinear quantile regression in the 0.25, 0.5, and 0.75 quantiles
The experiment was conducted from December 2017 to July 2018 in a greenhouse belonging to the olericulture sector of the Department of Plant Science, Federal University of Viçosa (UFV), municipality of Viçosa, mesoregion of Zona da Mata, Minas Gerais State, Brazil (20o 45’ S and 42o 51’ W, average altitude of 650 m)
Summary
Pepper (Capsicum spp.) is one of the main horticultural crops in the world, with wide variation of extrinsic and intrinsic characteristics and wide plasticity of uses, Rev. Bras. The increasing commercial interest in pepper fruits has contributed to the appearance of a large number of cultivars that combine high yield, resistance to diseases, aesthetic attractiveness, and other traits (SASU et al, 2013; NEITZKE et al, 2016; CABRAL et al, 2017). Global pepper production has been showing continuous growth in harvested area and yield (JARRET et al, 2019). Asia contributed with 68.4% of the world production of Capsicum spp. In the production of dried fruit, the ranking is analogous (FAO, 2018)
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