Articles
CAN DENSITY SORTING AT HARVEST SEGREGATE MIXED MATURITY OF FEIJOA?
Article number
687_10
Pages
93 – 98
Language
English
Abstract
Harvested fruit of feijoa (Feijoa sellowiana) are of mixed stages of maturity.
To ascertain whether a non-destructive technique such as density grading could discriminate between fruit with different internal attributes, the density of 400 fruit (cv. Apollo) was recorded using fruit samples categorised as unripe, ripe and over-ripe.
Density was subsequently correlated with physicochemical measurements and ripeness indices from dissected fruit.
Fruit densities ranged between 920 and 990 kg m-3. No convincing relationships with density were observed with dry matter (DM) (r = 0.20; P<0.001), soluble solids (r = 0.08; not significant), or locule clearing (r = 0.32; P<0.001), a ripeness index specific to feijoa.
The highly variable nature of the density data was attributed to internal trapped air.
From the density of the dry matter of feijoa fruit, mean (and standard deviation) 1587 (11) kg m-3, internal airspace was found to range between 6 and 15% of the volume of individual fruit.
The likely cause for the presence of air is poor pollination.
This eliminates Apollo as a candidate for grading by density methods, but does not preclude the possibility that other feijoa cultivars may be better contenders.
To ascertain whether a non-destructive technique such as density grading could discriminate between fruit with different internal attributes, the density of 400 fruit (cv. Apollo) was recorded using fruit samples categorised as unripe, ripe and over-ripe.
Density was subsequently correlated with physicochemical measurements and ripeness indices from dissected fruit.
Fruit densities ranged between 920 and 990 kg m-3. No convincing relationships with density were observed with dry matter (DM) (r = 0.20; P<0.001), soluble solids (r = 0.08; not significant), or locule clearing (r = 0.32; P<0.001), a ripeness index specific to feijoa.
The highly variable nature of the density data was attributed to internal trapped air.
From the density of the dry matter of feijoa fruit, mean (and standard deviation) 1587 (11) kg m-3, internal airspace was found to range between 6 and 15% of the volume of individual fruit.
The likely cause for the presence of air is poor pollination.
This eliminates Apollo as a candidate for grading by density methods, but does not preclude the possibility that other feijoa cultivars may be better contenders.
Authors
C.J. Clark, A. White, A. Woolf, K. Domijan
Keywords
Feijoa sellowiana, fruit quality, non-destructive testing, density
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