Resumo

MAYANS CESPEDES, Pedro Ramón; LOPEZ CANSTENS, Gilberto de Jesús; ROMANCHIK KRIUCHKOVA, Eugenio  e  PEREZ SOBREVILLA, Luciano. Elastic properties of mango fruit-stalk system related to harvest by vibration. Rev. Mex. Cienc. Agríc [online]. 2015, vol.6, n.8, pp.1781-1790. ISSN 2007-0934.

In Mexico, mango ranks second in terms of surface planted with 176 781 490 hectares; when mango is destined for consumption as fresh fruit, harvest is done manually, however, with increasing demand for processed products, mechanical harvesting is a viable alternative for fruit collection using inertial vibrators. This study aims to determine the elastic properties of stalk and mango fruit-stalk systems that form the physical and mechanical properties required for the analysis of the system dynamics, in order to obtain the optimal values of vibration frequency and amplitude for selective harvest of fruits. To do so, a methodology was developed and selected instruments for measurement according to details required by Mexican standards. The determinations were performed in an experimental plot of Manila mango in Idolos, Veracruz; during June 2013, obtaining average values of rigidity, flexural modulus of elasticity, Poisson's coefficient and the shear modulus of the stalk and the bending moment required for fruit detachment, in three stages of ripening. Tukey test indicates that there is 95% level of significance, significant differences between the means of the physic-mechanical properties for ripe fruits, physiological ripening and green, being an aspect that favors selective harvest of fruits when vibration is applied to branches.

Palavras-chave : Mangifera indica L.; design parameters; selective detachment.

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