Predicting the Diameters and the Mass of Golden Delicious Apple Fruits Using Growing Degree Days

Dhimitri Papamihal
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Dhimitri Papamihal: University “Fan S. Noli”

Journal of Knowledge Management, Economics and Information Technology, 2014, vol. 4, issue 1.1, 6

Abstract: A two-year study (2012-2013) was performed in an apple orchard of Devoll District, Albania, to develop predictive tables for size and mass of Golden Delicious cultivar fruits. Five trees of same age and vigour were chosen, and in each tree forty fruits were randomly selected and tagged. Fruit diameters were measured on a weekly basis, starting from 40 Days After Full Bloom (DAFB) to harvest (152 DAFB). The accumulated Growing Degree Days (GDD) from 40 DAFB to harvest were used as independent variables in regression equations. Among three regression models compared, the quadratic equation resulted being the best in describing the relationship between each diameter’s growth and the accumulated GDD, with the highest adjusted coefficient of determination (0.999 to 1.0) and the lowest residual standard deviation (0.052 to 0.22). Equatorial and longitudinal diameters used in multiple regressions provided high accuracy predictions of fruit mass.

Date: 2014
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