Abstract
Abstract Blackberry is a small fruit with several properties beneficial to human health and its cultivation is an alternative for small producers due to its fast and high financial return. Studying the growth of fruits over time is extremely important to understand their development, helping in the most appropriate crop management, avoiding post-harvest losses, which is one of the aggravating factors of blackberry cultivation, being a short shelf life fruit. Thus, growth curves are highlighted in this type of study and modeling through statistical models helps understanding how such growth occurs. Data from this study were obtained from an experiment conducted at the Federal University of Lavras in 2015. The aim of this study was to adjust nonlinear, double Logistic and double Gompertz models to describe the diameter growth of four blackberry cultivars (‘Brazos’, ‘Choctaw’, ‘Guarani’ and ‘Tupy’). Estimations of parameters were obtained using the least squares method and the Gauss-Newton algorithm, with the “nls” and “glns” functions of the R statistical software. The comparison of adjustments was made by the Akaike information criterion (AICc), residual standard deviation (RSD) and adjusted determination coefficient (R2 aj). The models satisfactorily described data, choosing the Logistic double model for ‘Brazos’ and ‘Guarani’ cultivars and the double Gompertz model for ‘Tupy’ and ‘Choctaw’ cultivars.
Highlights
Small fruits, such as blackberry, strawberry, raspberry, currant, blueberry, among others, are growing in importance, quality and production volume
Most of the production is destined to the consumption of the processed fruit, in the form of jellies, juices, ice cream, among others. The processing of these fruits is justified by the fact that they are highly perishable, that is, they have short shelf life (TULLIO, 2013)
According to Antunes et al (2014), the fresh fruit consists of 85% water, 10% carbohydrates, minerals, vitamins A and B and calcium, with some benefits to human health, such as bleeding control, blood pressure, sedative effect, action oxidant, among others
Summary
Small fruits, such as blackberry, strawberry, raspberry, currant, blueberry, among others, are growing in importance, quality and production volume. The cultivation of these fruits is characterized by the low implantation and production cost and good economic return. Most of the production is destined to the consumption of the processed fruit, in the form of jellies, juices, ice cream, among others. The processing of these fruits is justified by the fact that they are highly perishable, that is, they have short shelf life (TULLIO, 2013). According to Antunes et al (2014), the fresh fruit consists of 85% water, 10% carbohydrates, minerals, vitamins A and B and calcium, with some benefits to human health, such as bleeding control, blood pressure, sedative effect, action oxidant, among others
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