African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6840

Full Length Research Paper

Determination of macaw fruit harvest period by biospeckle laser technique

Anderson Gomide Costa
  • Anderson Gomide Costa
  • Departamento de Engenharia, Instituto de Tecnologia, Universidade Federal Rural do Rio de Janeiro/UFRRJ, Brazil.
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Francisco de Assis de Carvalho Pinto
  • Francisco de Assis de Carvalho Pinto
  • Departamento de Engenharia Agrícola, Universidade Federal de Viçosa/UFV, Brazil.
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Roberto Braga Alves Júnior
  • Roberto Braga Alves Júnior
  • Departamento de Engenharia, Universidade Federal de Lavras/ UFLA, Brazil.
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Sérgio Yoshimitsu Motoike
  • Sérgio Yoshimitsu Motoike
  • Departamento de Fitotecnia, Universidade Federal de Viçosa/UFV, Brazil.
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Luís Manuel Navas Gracia
  • Luís Manuel Navas Gracia
  • Department of Agriculture and Forestry Engineering, Universidad de Valladolid/ Uva, Spain.
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  •  Received: 05 December 2016
  •  Accepted: 01 February 2017
  •  Published: 02 March 2017


Macaw palm has been stood out as a raw material for the production of bioenergy, because it has high productivity of oil and less emission of polluting waste during combustion, meeting the worldwide demand for sustainable energy sources. The aims of this research were the evaluation of response of the biologic activity measured by the optical technique of the biospeckle laser applied to macaw palm fruits at different maturity weeks and develop a classifier in function of biologic activity to determine the harvest period related with oil content in the fruits. To perform the experiment, 10 weeks fruits different maturity stages were evaluated. The biospeckle laser images were obtained by illuminating the epicarp of each fruit. The biological activity was quantified by absolute value of difference algorithm applied to biospeckle images. A neural network was developed to classify the fruits which were closer to harvest in function of biologic activity. Biologic activity showed a significant linear ratio (R2 = 0.913) with the maturation of fruits. Classification results have shown that fruits from 59th week after flowering are ideal for harvest and present the highest oil levels.

Key words: Biologic activity, optical sensors, maturity, oil content.