Variation in the storage life of 'Lobo', 'Aroma', 'Red Atlas' and 'Raike' apples during three years.
Dris, R.;
Acta Horticulturae Year: 1999 Issue: No. 485 Pages: 133-139 Ref: 16 ref.
1999
บทคัดย่อ
The effect of commercial harvesting dates on the storage life of 4 apple cultivars grown in the Aland Islands district of Finland (59-61 deg N., 19-20 deg E.) was investigated during 1993-1995. The effective temperature sums (above 5 deg C) during the growing seasons until the harvesting dates were: 1071-1092 (1993), 1174-1274 (1994) and 1299 degree days (1995), and the amounts of rainfall during May-September were 267, 273 and 169 mm, respectively. The commercial harvesting dates were as follows: 23 September 1993 and 14 September 1994 for Raike and Red Atlas; 3 October 1993 and 6 October 1994 for Lobo and Aroma and 11 October 1995 for all cultivars. The number of days from flowering until harvest was approximately: 130, 120 and 135 for Raike and Red Atlas and 140, 145 and 135 for Lobo and Aroma during 1993, 1994 and 1995, respectively. Fruits were stored for 3, 4 or 6 months at 2-4 deg C and 90-95% RH. At harvest, firmness per diameter was highest, diameter smallest and soluble solids content
(SSC) lowest in all fruits of all cultivars in 1993. Fruits of cv. Aroma had the highest firmness at harvest but after 2-3 months of storage the firmness per diameter of all cultivars declined to the same level. SSC was highest in the juice of Aroma (1994) and Lobo (1995), titratable acidity was highest in the juice of Red Atlas and lowest in the juice of Lobo; and the soluble solids:acid ratio was highest in the juice of Lobo and lowest in Red Atlas. Titratable acidity and the percentage of soluble solids decreased and pH and the soluble solids:acid ratio increased after one and 2 months of storage. In 1993 and 1994, the incidence of physiological disorders after 3 months of storage was about 10%. In 1993, Red Atlas fruits could be stored for 6 months, but the high incidence of physiological disorders in Raike and Lobo after 3 months of storage might be related to harvesting too early. In 1995, Lobo fruits could be stored for 6 months. Possibly because of late harvest, however, the other cultivars were susc
eptible to physiological disorders at an earlier stage of storage.