Agriculture Reference
In-Depth Information
Table 10.9
Ripening Rates of Plums at 10°, 20°
and 25°C Measured with a UC Firmness Tester
(8.0 mm Tip).
(Table 10.9). At 10°C, plum ripening was slow enough to
be considered negligible for many cultivars, and the rate of
softening is still slow at 20°C for most cultivars. The best
plum ripening can be accomplished when exposed to 25°C.
During ripening, plum TA decreased, but the amount varied
from cultivar to cultivar (Table 10.10). In general, plum TA
tended to decrease approximately 40% when reaching the
ripe stage (0.9-1.4 kg force).
Rate of softening (kg per day)
Cultivar
10°C
20°C
25°CF
Plums
Black Beaut
0.3
0.3
0.3
Santa Rosa
0.1
0.3
0.4
REFERENCES
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2
in controlled atmosphere storage on the devel-
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HortTechnology
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Postharvest News and Information
,
Blackamber
<0.1
0.3
0.32
Fortune
0.18
0.4
0.6
Friar
0.14
0.3
0.6
Simka
0.36
0.55
0.77
Royal Diamond
0.14
0.23
0.5
Casselman
0.06
0.23
0.3
Angeleno
0.0.045
0.0.18
0.0.23
Average
0.18
0.1.54
0.45
Table 10.10
Titratable Acidity of Plums at Harvest
(Mature), and After Ripening at 20°C Until the
Firmness of the Flesh Was Less Than 1.4 Kg-force
(Ripe).
Titratable Acidity (% malic acid)
Cultivar
Mature
Ripe
Change (%)
Plums
Black Beaut
0.61
0.49
-19.7
Santa Rosa
1.12
0.45
-59.8
Blackamber
0.61
0.59
-3.3
Fortune
1.11
0.43
-61.3
Friar
0.98
0.41
-58.2
Simka
1.31
0.41
-68.7
Royal Diamond
0.54
0.34
-37.0
Casselman
0.70
0.46
-34.3
Angeleno
0.42
0.33
-21.4
Average
0.82
0.43
-40.4
5
,
65 N-68 N.
Crisosto, C.H. (1999). Optimum procedures for ripening stone
fruit. In:
Management of Fruit Ripening
, pp. 28-30.
Postharvest Horticulture Series 9. University of California,
Davis.
Crisosto, C.H., Garner, D., Andris, H.L. & Day, K.R. (2004a)
Controlled delayed cooling extends peach market life.
HortTechnology
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size affects storage, market life.
California Agriculture
,
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33-36.
Retail outlet display considerations
Generally, if fruit firmness is greater than 2.3 kg-force, fruit
should be displayed on a dry table. If fruit firmness is less
than 2.3 kg-force, plums should be displayed on a cold table.
Retail ripening
Ideal plum ripening conditions are different than conditions
for other tree fruits. In general, plums have a significantly
slower rate of flesh softening than peaches and nectarines
