Production of biquinho pepper in different growing seasons characterized by the logistic model and its critical points

Maria Inês Diel,Francieli De Lima Tartaglia,Oscar Valeriano Sanchéz Valera,Bruno Giacomini Sari,Patrícia Jesus De Melo,Tiago Olivoto,Marcos Vinícius Marques Pinheiro,Alessandro Dal’Col Lúcio,Denise Schmidt

doi:10.1590/0103-8478cr20190477

Abstract

ABSTRACT: The objective of this study was to characterize the production of biquinho pepper through the interpretation of parameter estimates from the logistic model and its critical points obtained by the partial derivatives of the function, and to indicate the best cultivar and growing season for subtropical climate sites. For this, a 2x3 factorial experiment was conducted with two cultivars of biquinho pepper (BRS Moema and Airetama biquinho) in three growing seasons (E1: October 2015, E2: November 2015, E3: January 2016). The logistic non-linear model for fruit mass was specified as a function of the accumulated thermal sum, and the critical points were calculated through the partial derivatives of the model, in order to characterize the productive performance of the crop by the biological interpretation of the estimates of the three set parameters. In E3, temperatures close to 0 ºC during the experiment were lethal to the plants, and a linear regression model was used in this case. The production of the cultivars in E1 and E2 were well characterized by the estimated logistic models, and the most productive cultivar was Airetama biquinho in all evaluated seasons. This cultivar also presented higher concentration of production. The two cultivars did not differ significantly with regards to productive precocity. For E3, it was not possible to interpret the parameters in the same way as for E1 and E2, since the use of the linear model did not allow the same interpretations performed for the nonlinear model, reaffirming its applicability horticultural crops of multiple harvests.

Highlights

Capsicum is a genus that comprises several species of peppers, with different color, flavor and shapes (KIM, et al, 2014; PAULUS et al, 2017)
The objective of this study was to characterize the production of the biquinho pepper through interpretation obtained estimates of the parameters of the logistic model and its critical points obtained by the partial derivatives of the function, as well as to indicate the best cultivar and the best growing season for subtropical climate sites
The maximum temperatures remained, for a longer period of time, between 25 and 35oC, and these are ideal for tropical climate crops with biquinho pepper; the minimum temperatures that occur in a shorter period of time can compromise the whole crop

Summary

Introduction

Capsicum is a genus that comprises several species of peppers, with different color, flavor and shapes (KIM, et al, 2014; PAULUS et al, 2017). These peppers are of great economic and social importance in several regions of the world with Vietnam, Indonesia, India, Brazil and China as leading producers (FAOSTAT, 2019). V.50, n.4, The biquinho pepper is multiple-harvest crop That is, it can be harvested several times from the same plant during the production cycle. It can be harvested several times from the same plant during the production cycle Because it is a species found in tropical climates, it is temperature dependent. As a result of this, it is possible to simulate the consequence of the air temperature on the growth and development of the plants as a function of the accumulated thermal sum (MENDONÇA et al, 2012)

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Conclusion