Electronic color sorting of strawberries

Authors: Bulley, N.R., Staley, L.M. And H.K. Mehra
Description: The handpicking and sorting of straw berries necessitates a seasonal labor force. The management and salaries for these workers represents a major expenditure in time and money to the strawberry grower. One of the solutions to this problem would be the automation of strawberry picking and sorting. There are two main approaches to the mechanical picking of strawberries: (1) the once-over harvester, which would harvest all of the straw berries at one time (2) the selective harvester, which would select only those berries that are ripe and leave the unripe berries to be harvested at a later date. At the moment the once-over harvester seems to be feasible, but it would be incapable of selecting only the ready-to-pick fruit. Normally the picking and sorting operations are carried out by a visual color judgement of fruit ripeness, which is evaluated on the basis of surface redness. If berries are to be picked mechanically and then processed in a continuous operation, some suitable criterion that correlates with the ripeness of the berry is needed for quick and accurate sorting. An instrument capable of distinguishing between a no. 1 grade of berry and a packing berry could then be used in conjunction with the mechanical once over harvester for final sorting of the fruit. Several researchers have reported on the reflectance properties of a variety of fruits and correlated these results with different physical properties of the fruit that might indicate the degree of maturity of the fruitb, c, d, e (1, 4, 6, 7).
Keywords: electronic color sorting of strawberries
Citation: Bulley, N.R., Staley, L.M. and H.K. Mehra 1973. ELECTRONIC COLOR SORTING OF STRAWBERRIES. Canadian Agricultural Engineering 15(2):103-106.
Volume: 15
Issue: 2
Start page number: 103
End page number: 106
Date: 1973
Coverage: Canada
Located in: Volume 15 (1973)