Reaction of potato tubers to compression during storage in a pile store
Zbigniew Czerko
z.czerko@ihar.edu.plZakład Przechowalnictwa i Przetwórstwa Ziemniaka, Instytut Hodowli i Aklimatyzacji Roślin, Oddział Jadwisin (Poland)
Abstract
In modern storage houses potatoes can be stored in a bulk up to a height of 5 m. In the lower layer the potatoes are subjected to a strong pressure force. After storage lasting 7 months potatoes often become deformed and pressure-bruising. The experiment was performed on 4 potato cultivars: Danusia, Mila, Kuba, and Triada, which were squeezed in press-boxes simulating the pile height of 2.5 (box A) and 5.0 m (box B), and in the control box with no pressure (box C). The boxes with ventilating holes were placed in a storage room in which the temperature of 4°C, as recommended for table potatoes, was maintained throughout the experiment. After a 7-month storage period, the surface of the biggest pressure-bruise on the tuber, natural losses and the length of sprouts were evaluated. The pressure-bruise was clearly visible on the tubers of all investigated cultivars. In box B, the mean surface of the largest pressure-bruise for 4 cultivars was 413 mm2, whereas that in box A measured 328 mm2. Natural losses in particular cultivars were the smallest in box B. They were significantly larger in box A and in a control box C. Their average length for 4 cultivars was 12.8 mm. In a control box the mean length of sprouts was 9.8 mm. No changes in the form of parenchyma darkening at the site of the pressure-bruise were observed either directly after treatment or after further 4 days of storage.
Keywords:
pile, store, pressure-brusing, potatoReferences
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Authors
Zbigniew Czerkoz.czerko@ihar.edu.pl
Zakład Przechowalnictwa i Przetwórstwa Ziemniaka, Instytut Hodowli i Aklimatyzacji Roślin, Oddział Jadwisin Poland
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Copyright (c) 2003 Zbigniew Czerko
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