Internal quality of apples during storage
2006
Soska, A., Warsaw Agricultural Univ. (Poland). Dept. of Pomology and Basic Natural Sciences in Horticulture | Tomala, K., Warsaw Agricultural Univ. (Poland). Dept. of Pomology and Basic Natural Sciences in Horticulture
The investigations were carried out in two successive seasons (2003/2004 and 2004/2005) on 29 apple cultivars obtained from trees on the rootstock M.9, which at the beginning of the investigation were six years old. The apples were picked when their starch index reached the values from 6 to 8. Fruit samples were stored for 4 months in common cold storage at +2 deg C. At harvest and after 2, and 4 months of storage, firmness, titratable acidity and soluble solids were determined. Apples of the evaluated cultivars significantly differed in firmness and organic components content, shaping their internal quality. After 4 months of storage high firmness, independently of the season of determination, was characteristic for 'Fuji', 'Fiesta', 'Pinova', 'Topaz', Alwa', 'Gorjaczkowski Seedling' and 'XIX-133-D2' apples. A high soluble solids content (is greater than 15 deg Brix) was recorded in 'Redgold' and 'Golden Delicious' and a high titratable acidity (is greater than 0.6%) in 'Topaz' and 'Gorjaczkowski Seedling' aples. The ratio of soluble solids to organic acids increased with storage time. After 4-month of storage a very high value of that ratio was found in 'Fuji', 'Gala' and 'Redgold' (is greater than 60) and comparatively low (is less than 30) in 'Gorjaczkowski Seedling', 'Sava', 'Topaz' and 'Witos'.
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