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Storage experiments with apples 1984 89

Storage experiments with apples 1984 89

Tidsskrift for Planteavl 94(1): 39-50

In a recently established experimental plant at the Institute of Pomology storage experiments with three apple cultivars: 'Gloster', 'Jonagold' and 'Mutsu' have been carried out from 1984 till 1989. Normal cool storage at C and C has been compared with CA-storage under various CO2 and O2 conditions and temperatures from to C. These three cultivars are generally considered reliable in store, but the incidence of superficial scald and brown core has in certain years been rather high, predominantly after CA-storage. Fruit from the traditional cold store have been charged a considerable loss, mainly through transpiration. As a loss of weight exceeding a few percent has a negative impact on the eating quality, the term "quality index" has been set up. This index is based partly on actual storage disorders partly on loss of weight. After having sorted out the injured fruits the remaining terms of per cent of total loaded multiplied by a value factor in accordance with the recorded loss of weight. The best results with normal cold storage were obtained at the lowest temperature, C. The loss of weight, caused mainly by transpiration, could however at best be kept at 1 per cent per month. So that type of storage ought not exceed 2-3 months. Under CA-conditions with more than 3-4 per cent CO2 'Gloster' turned out to be susceptible to brown core. At C superficial scald was found one year. The optimum CA-conditions for 'Gloster' were 1-2 per cent CO2 and 2-3 per cent O2. 'Jonagold' showed susceptibility to superficial scald at C, but CO2-concentrations of 6-8 per cent counteracted this disorder. The best CA-conditions for 'Jonagold' were either 5-6 per cent CO2 without scrubber or 5 per cent CO2 and 3 per cent O2. Except for one year with brown core the prevalent disorder of 'Mutsu' was superficial scald. CO2-concentrations of 6-8 per cent reduced this problem. Good results were also obtained with scrubbed storage and 5 per cent CO2-2-3 per cent O2. A general experience from these storage experiments was a pronounced increase of storage disorders during the two weeks of post storage treatment at C.

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