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| Authors: | C. Dussi, D. Sugar, T. Righetti, A. Azarenko |
Abstract:
Trees of 'Sensation' Red Bartlett were evaporatively cooled with overtree sprinkler irrigation in Medford, OR, 1992. Fruit color was measured on the shaded and exposed surfaces with a Minolta CR-200b portable tristimulus colorimeter using the Commission Internationale de l'Éclairage color space (L*, a* and b*) coordinates.
Measurements were made four times during maturity.
Cooling increased hue and L* value and color differences between exposed and shaded fruit surfaces increased with maturity.
Fruits from cooled trees matured earlier.
In a separate experiment gelatine filters of different wavelength were attached over the exposed surface of 'Sensation' pear fruits one month before harvest.
Chromaticity was measured before the filters were placed and at harvest after their removal.
All filters yielded less hue than the control.
Wavelengths between 600 and 700 nm seemed to have a large effect on hue.
Wavelengths from 400 to 500 nm gave the smallest hue, chroma and L* value.
Aluminum foil wrapped fruits differed significantly from the control in hue and L* but not in chroma.
Wavelengths from 400 to 500 nm gave darker, less chromatic and redder pear fruits.
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